Abelia  

Abeliophyllum (white forsythia)  

Abelmoschus (okra)  

Abies (fir)  

Abromeitiella (obsolete)  

Abronia (sand verbena)  

Abutilon  

Acacia (wattle)  

Acaena  

Acalypha  

Acantholimon  

Acanthophoenix  

Acanthus  

Acca  

Acer (maple)  

Achillea (yarrow)  

Achimenantha (hybrid genus)  

Achimenes  

Acinos (calamint)  

Aciphylla  

Acmena  

Acoelorraphe (saw palm)  

Acokanthera  

Aconitum (aconite, monkshood)  

Acorus  

Acrocomia  

Actaea (baneberry)  

Actinidia (kiwifruit)  

Ada  

Adansonia  

Adenia  

Adenium  

Adenocarpus  

Adenophora  

Adenostoma  

Adiantum (maidenhair fern)  

Adlumia  

Adonis  

Adromischus  

Aechmea  

Aegopodium  

Aeonium  

Aerangis (an orchid genus)  

Aerides (an orchid genus)  

Aeschynanthus  

Aesculus (buckeye, horse-chestnut)  

Aethionema  

Agapanthus  

Agapetes  

Agastache  

Agathis  

Agave  

Ageratum  

Aglaonema  

Agonis  

Agrostemma (corn cockle)  

Agrostis  

Aichryson  

Ailanthus  

Aiphanes  

Aira (hair grass)  

Ajania  

Ajuga (bugleweed)  

Akebia  

Alangium  

Albizia (silk tree)  

Albuca  

Alcea (hollyhock)  

Alchemilla  

Aleurites  

Aliceara (hybrid genus)  

Alisma (water plantain)  

Alkanna  

Allamanda  

Allium (onion)  

Alluaudia  

Alnus (alder)  

Alocasia  

Aloe  

Aloinopsis  

Alopecurus (foxtail grass)  

Aloysia  

Alpinia (ginger lily)  

Alsobia  

Alstroemeria  

Alternanthera  

Althaea  

Alyogyne  

Alyssum  

Amaranthus  

Amarcrinum (hybrid genus)  

Amarygia (hybrid genus)  

Amaryllis  

Amberboa  

Amelanchier  

Amesiella  

Amherstia  

Amicia  

Ammi  

Ammobium  

Amorpha  

Amorphophallus  

Ampelopsis  

Amsonia  

Anacampseros  

Anacyclus  

Anagallis (pimpernel)  

Ananas (pineapple)  

Anaphalis  

Anchusa  

Andromeda  

Andropogon  

Androsace  

Anemonella  

Anemone (windflower)  

Anemonopsis  

Anemopaegma  

Anethum (dill)  

Angelica  

Angelonia  

Angophora  

Angraecum (an orchid genus)  

Anguloa (an orchid genus)  

Angulocaste (hybrid genus)  

Anicacanthus  

Anigozanthos  

Anisodontea  

Anoda  

Anomatheca  

Anopterus  

Anredera  

Antennaria  

Anthemis  

Anthericum  

Anthriscus  

Anthurium  

Anthyllis  

Antigonon  

Antirrhinum (snapdragon)  

Aphelandra  

Aphyllanthes  

Aponogeton  

Aporocactus  

Aporoheliocereus (hybrid genus)  

Aptenia  

Aquilegia (columbine)  

Arabis (rock cress)  

Arachnis (scorpion orchid)  

Araeococcus  

Aralia  

Araucaria (monkey-puzzle)  

Araujia  

Arbutus (madrone)  

Archontophoenix (king palm)  

Arctostaphylos (bearberry, manzanita)  

Arctotheca  

Arctotis (African daisy)  

Ardisia  

Areca  

Arenaria (sandwort)  

Arenga  

Argemone (prickly poppy)  

Argyranthemum  

Argyreia  

Argyroderma  

Ariocarpus  

Arisaema  

Arisarum  

Aristea  

Aristolochia  

Armoracia  

Arnebia  

Arnica  

Aronia (chokeberry)  

Arrabidaea  

Arrhenatherum (oat grass)  

Artemisia (mugwort, sagebrush, wormwood)  

Arthropodium  

Arum  

Aruncus  

Arundinaria  

Arundo  

Asarina  

Asarum (wild ginger)  

Asclepias (milkweed, silkweed)  

Ascocenda (hybrid genus) (an orchid genus)  

Asimina  

Asparagus  

Asperula (woodruff)  

Asphodeline  

Asphodelus (asphodel)  

Aspidistra  

Asplenium  

Astelia  

Aster  

Asteranthera  

Astilbe  

Astilboides  

Astragalus (milk vetch)  

Astrantia  

Astrophytum  

Atherosperma  

Athrotaxis  

Athyrium  

Atriplex  

Aubrieta  

Aucuba  

Aurinia  

Austrocedrus  

Azalea  

Azara  

Azolla  

Azorella  

Azorina  

Aztekium  

Babiana  

Baccharis  

Backhousia  

Backopa (water hyssop)  

Baeckea  

Ballota  

Balsamorhiza (balsam root)  

Bambusa (bamboo)  

Banksia  

Baptisia  

Barbarea (Yellow rocket or winter cress)  

Barkeria (an orchid genus)  

Barleria  

Bassia  

Bauera  

Bauhinia  

Beaucarnea  

Beaufortia  

Beaumontia  

Begonia  

Belancanda  

Bellevalia  

Bellis (daisy)  

Bellium  

Berberidopsis  

Berberis (barberry)  

Berchemia  

Bergenia  

Bergerocactus  

Berkheya  

Berlandiera  

Bertolonia  

Beschorneria  

Bessera  

Beta (beet)  

Betula (birch)  

Biarum  

Bidens  

Bignonia  

Billardiera  

Billbergia  

Bixa  

Blandfordia  

Blechnum (hard fern)  

Bletilla (an orchid genus)  

Bloomeria  

Blossfeldia  

Boenninghausenia  

Bolax  

Bolbitis  

Bollea  

Boltonia  

Bolusanthus  

Bomarea  

Bombax  

Bongardia  

Borago  

Borassus  

Boronia  

Bothriochloa  

Bougainvillea  

Bouteloua  

Bouvardia  

Bowenia  

Bowiea  

Brachychiton  

Brachyglottis  

Brachyscome  

Brachysema  

Brachystelma  

Bracteantha  

Brahea (Hesper palm)  

Brassavola (an orchid genus)  

Brassia (an orchid genus)  

Brassica (mustard, cabbage)  

Brassocattleya (hybrid orchids)  

Brassolaeliocattleya (trigeneric hybrid orchids)  

Breynia  

Briggsia  

Brimeura  

Briza (quaking grass)  

Brodiaea  

Bromelia  

Broughtonia  

Broussonetia  

Browallia  

Brownea  

Browningia  

Bruckenthalia  

Brugmansia  

Brunfelsia  

Brunnera  

Brunsvigia  

Buddleja  

Buglossoides  

Bulbine  

Bulbinella  

Bulbocodium  

Bulbophyllum (an orchid genus)  

Buphthalmum  

Bupleurum  

Burchardia  

Burchellia  

Bursera  

Butea  

Butia  

Butomus  

Buxus (boxwood)  

Cabomba  

Caesalpina  

Caladium  

Calamagrostis (reed grass, smallweed)  

Calamintha (calamint)  

Calamus  

Calandrinia  

Calanthe  

Calathea  

Calceolaria (slipperwort)  

Calendula (marigold)  

Calibanus  

Calla  

Calliandra  

Callianthemum  

Callicarpa (beautyberry)  

Callirhoe (poppy mallow)  

Callisia  

Callistemon (bottlebrush)  

Callistephus (Chinese aster)  

Callitriche (water starwort)  

Calltris  

Calluna (heather)  

Calocedrus (incense-cedar)  

Calochone  

Calochortus  

Calomeria  

Caloscordum  

Calothamnus  

Calpurnia  

Caltha (kingcup, marsh marigold)  

Calycanthus  

Calymmanthium  

Calypso (an orchid genus)  

Calytrix (starflower)  

Camassia (quamash)  

Camellia  

Campanula (bellflower)  

Campsis (trumpet vine)  

Campylotropsis  

Canarina  

Canistrum  

Canna  

Cantua  

Capsicum (pepper)  

Caragana (peashrub)  

Caralluma  

Cardamine (bittercress)  

Cardiocrinum  

Cardiospermum  

Carex (sedge)  

Carissa  

Carlina  

Carludovica  

Carmichaelia  

Carnegiea (saguaro)  

Carpentaria  

Carpenteria  

Carpinus (hornbeam)  

Carpobrotus  

Carthamus (safflower)  

Carum (caraway)  

Carya (hickory, pecan)  

Caryopteris  

Caryota (fishtail palm)  

Cassia  

Cassinia  

Cassiope  

Castanea (chestnut)  

Castanopsis  

Castanospermum  

Casuarina  

Catalpa  

Catananche  

Catasetum (an orchid genus)  

Catharanthus (Madagascar Periwinkle)  

Catopsis  

Cattleya (an orchid genus)  

Caulophyllum  

Cautleya  

Cavendishia  

Ceanothus (California-lilac)  

Cedronella  

Cedrus (cedar)  

Ceiba (Kapok)  

Celastrus (staff-vine)  

Celmisia (New Zealand daisy)  

Celosia (cockscomb)  

Celtis (hackberry)  

Centaurea  

Centaurium  

Centradenia  

Centranthus (valerian)  

Cephalaria  

Cephalocereus  

Cephalophyllum  

Cephalotaxus (plum-yew)  

Ceraria  

Cerastium  

Ceratopetalum  

Ceratophyllum  

Ceratopteris  

Ceratostigma  

Ceratozamia  

Cercidiphyllum  

Cercis  

Cercocarpus  

Cereus  

Ceropegia  

Cestrum  

Chaenomeles (flowering quince)  

Chaenorhinum (dwarf snapdragon)  

Chaerophyllum  

Chamaecyparis (cypress)  

Chamaecytisus  

Chamaedaphne  

Chamaedorea  

Chamaelirium  

Chamaemelum (chamomile)  

Chamaerops  

Chamelaucium  

Chasmanthe  

Chasmanthium  

Cheilanthes  

Cheiridopsis  

Chelidonium  

Chelone (turtlehead)  

Chiastophyllum  

Chiliotrichum  

Chilopsis (desert willow)  

Chimaphila  

Chimonanthus (wintersweet)  

Chimonobambusa  

Chionanthus (fringe tree)  

Chionochloa  

Chionodoxa (glory of the snow)  

Chionoscilla (hybrid genus)  

Chirita  

Chlidanthus  

Choisya  

Chorisia  

Chorizema  

Chrysalidocarpus  

Chrysanthemum  

Chrysogonum  

Chrysolepis  

Chrysosplenium  

Chrysothemis  

Chusquea  

Cibotium  

Cicerbita  

Cichorium (chicory, endive)  

Cimicifuga (bugbane)  

Cinnamomum  

Cionura  

Cirsium  

Cissus  

Cistus (rockrose, sun rose)  

Citrofortunella (hybrid genus)  

Citrus (lime, lemon)  

Cladanthus  

Cladrastis  

Clarkia  

Claytonia  

Cleistocactus  

Clematis  

Cleome (spider flower)  

Clerodendrum  

Clethra (summersweet)  

Cleyera  

Clianthus  

Clintonia  

Clitoria  

Clivia  

Clusia  

Clytostoma  

Cobaea  

Coccoloba (sea grape)  

Coccothrinax (thatch palm)  

Cocculus  

Cochlioda  

Cocos (coconut)  

Codiaeum (croton)  

Codonanthe  

Codonopsis  

Coelia  

Coelogyne (an orchid genus)  

Coix  

Colchicum (autumn crocus, meadow saffron)  

Coleonema  

Colletia  

Collinsia  

Collomia  

Colocasia (taro)  

Colquhounia  

Columnea  

Colutea (bladder senna)  

Coluteocarpus  

Colvillea  

Combretum  

Commelina (day flower, spiderwort)  

Comptonia  

Conandron  

Congea  

Conicosia  

Coniogramme  

Conophytum  

Consolida (larkspur)  

Convallaria (lily-of-the-valley)  

Convolvulus (bindweed, morning glory)  

Copernicia (wax palm)  

Copiapoa  

Coprosma  

Coptis (goldthread)  

Cordia  

Cordyline  

Coreopsis (tickseed)  

Coriandrum (coriander cilantro)  

Coriaria  

Cornus (dogwood)  

Corokia  

Coronilla  

Correa  

Corryocactus  

Cortaderia (pampas grass, tussock grass)  

Cortusa  

Corydalis  

Corylopsis (winter-hazel)  

Corylus (hazel, filbert)  

Corynocarpus  

Corypha  

Coryphantha  

Cosmos  

Costus  

Cotinus (smoke tree)  

Cotoneaster  

Cotula  

Cotyledon  

Crambe  

Craspedia  

Crassula  

Crataegus (hawthorn)  

Crepis  

Crinodendron  

Crinum  

Crocosmia  

Crocus  

Crossandra  

Crotalaria (rattlebox)  

Crowea  

Cryptanthus  

Cryptbergia (hybrid genus)  

Cryptocoryne (water trumpet)  

Cryptomeria (Sugi)  

Ctenanthe  

Cunila  

Cunninghamia (China-fir)  

Cunonia  

Cuphea  

Cupressus (cypress)  

Curcuma  

Cyananthus  

Cyanotis  

Cyathea (tree fern)  

Cyathodes  

Cybistax  

Cycas (cycad, sago "palm")  

Cyclamen  

Cycnoches  

Cydonia (quince)  

Cymbalaria (Ivy-leaved toadflax)  

Cymbidium (an orchid genus)  

Cymbopogon  

Cynara  

Cynoglossum  

Cypella  

Cyperus  

Cyphomandra (tree tomato)  

Cyphostemma  

Cypripedium (an orchid genus)  

Cyrilla  

Cyrtanthus  

Cyrtomium  

Cyrtostachys  

Cystopteris (bladder fern)  

Cytisus (broom)  

Daboecia  

Dacrydium  

Dactylis  

Dactylorhiza (marsh orchid)  

Dahlia  

Dais  

Dalea (indigo bush)  

Damasonium  

Dampiera  

Danae  

Daphne  

Daphniphyllum  

Darmera  

Darwinia (scent myrtle)  

Dasylirion  

Davallia  

Davidia  

Decaisnea  

Decarya  

Decumaria  

Deinanthe  

Delonix  

Delosperma  

Delphinium  

Dendranthema  

Dendrobium (an orchid genus)  

Dendrocalamus  

Dendrochilum  

Dendromecon (tree poppy)  

Denmoza  

Dennstaedtia  

Deschampsia (hair grass)  

Desfontainia  

Desmodium  

Deutzia  

Dianella (flax lily)  

Dianthus (carnation, pink)  

Diascia  

Dicentra (bleeding heart)  

Dichelostemma  

Dichondra  

Dichorisandra  

Dicksonia  

Dicliptera  

Dictamnus  

Dictyosperma (princess palm)  

Didymochlaena  

Dieffenbachia  

Dierama  

Diervilla (bush honeysuckle)  

Dietes  

Digitalis (foxglove)  

Dillenia  

Dillwynia  

Dimorphotheca (African daisy)  

Dionaea (Venus flytrap)  

Dionysia  

Dioon  

Dioscorea (yam)  

Diospyros  

Dipcadi  

Dipelta  

Diphylleia  

Diplarrhena  

Diplazium  

Diplocyclos  

Dipsacus (teasel)  

Dipteronia  

Dirca  

Disa (an orchid genus)  

Disanthus  

Discaria  

Dischidia  

Discocactus  

Disocactus  

Disporopsis  

Disporum (fairy bells)  

Distictis  

Distylium  

Docynia  

Dodecatheon (shooting stars)  

Dodonaea  

Dombeya  

Doodia  

Doronicum  

Dorotheanthus (ice plant)  

Dorstenia  

Doryanthes (spear lily)  

Doryopteris  

Draba  

Dracaena  

Dracocephalum  

Dracula (an orchid genus)  

Dracununculus  

Dregea  

Drimys  

Drosanthemum  

Drosera (sundew)  

Dryandra  

Dryas  

Drynaria  

Dryopteris (buckler fern)  

Duchesnea  

Dudleya  

Duranta  

Duvalia  

Dyckia  

Ebracteola  

Ecballium  

Eccremocarpus  

Echeveria  

Echidnopsis  

Echinacea (coneflower)  

Echinocactus  

Echinocereus  

Echinops (globe thistle)  

Echinopsis  

Echium  

Edgeworthia  

Edithcolea  

Edraianthus  

Egeria  

Ehretia  

Eichhornia (water hyacinth)  

Elaeagnus  

Elaeis (oil palm)  

Elaeocarpus  

Elatostema  

Eleocharis (spike rush)  

Elettaria  

Eleutherococcus  

Elodea (pondweed)  

Elsholtzia  

Elymus (wild rye)  

Embothrium  

Emilia (tassel flower)  

Emmenopterys  

Encelia  

Encephalartos (Kaffir bread)  

Encyclia (an orchid genus)  

Enkianthus  

Ensete  

Eomecon (snow poppy)  

Epacris  

Ephedra (ephedra)  

Epidendrum (an orchid genus)  

Epigaea  

Epilobium  

Epimedium (barrenwort)  

Epipactis (helleborine, an orchid genus)  

Epiphyllum (orchid cactus)  

Episcia (flame violet)  

Epithelantha  

Equisetum (horsetail)  

Eragrostis (love grass)  

Eranthemum  

Eranthis (winter aconite)  

Ercilla  

Eremophila (emu bush)  

Eremurus  

Erica (heath, heather)  

Erigeron (fleabane)  

Erinacea  

Erinus  

Eriobotrya  

Eriogonum  

Eriophorum (cotton grass)  

Eriophyllum  

Eriostemon (waxflower)  

Eritrichium  

Erodium  

Eryngium (eryngo, sea holly)  

Erysimum (wallflower)  

Erythrina (coral tree)  

Erythronium  

Escallonia  

Eschscholzia (California poppy)  

Escobaria  

Espostoa  

Etlingera  

Eucalyptus (Gum tree, ironbark)  

Eucharis  

Eucomis  

Eucommia  

Eucryphia  

Eulophia (an orchid genus)  

Euonymus  

Eupatorium  

Euphorbia (spurge)  

Euptelea  

Eurya  

Euryale  

Euryops  

Eustoma  

Evolvulus  

Exacum  

Exochorda  

Fabiana  

Fagus (beech)  

Fallopia  

Farfugium  

Fargesia  

Fascicularia  

Fatshederae (hybrid genus)  

Fatsia  

Faucaria  

Felicia (blue daisy)  

Fendlera  

Fenestraria  

Ferocactus  

Ferraria  

Ferula (giant fennel)  

Festuca (fescue)  

Fibigia  

Ficus (fig)  

Ficus pumila  

Filipendula  

Firmiana  

Fittonia  

Fitzroya  

Fockea  

Foeniculum (fennel)  

Fontanesia  

Forsythia  

Fortunella (kumquat)  

Fothergilla  

Fouquieria  

Fragaria (strawberry)  

Frailea  

Francoa  

Franklinia  

Fraxinus (ash)  

Freesia  

Fremontodendron  

Fritillaria (fritillary)  

Fuchsia  

Furcraea  

Gagea  

Gaillardia  

Galanthus (snowdrop)  

Galax  

Galega  

Galium (bedstraw)  

Galtonia  

Gardenia  

Garrya  

Gasteria  

Gaultheria  

Gaura  

Gaylussacia (huckleberry)  

Gazania  

Geissorhiza  

Gelsemium  

Genista  

Gentiana (gentian)  

Gentianopsis  

Geranium (cranesbill, not same as Pelargonium)  

Gerbera  

Gesneria  

Geum (avens)  

Gevuina  

Gibbaeum  

Gilia  

Gillenia  

Ginkgo  

Gladiolus  

Glaucidium  

Glaucium  

Gleditsia (honey locust)  

Globba  

Globularia (globe daisy)  

Gloriosa  

Glottiphyllum  

Gloxinia  

Glyceria  

Glycyrrhiza  

Gomphocarpus  

Gomphrena  

Goniolimon  

Goodyera (jewel orchid)  

Gordonia  

Graptopetalum  

Graptophyllum  

Graptoveria (hybrid genus)  

Grevillea  

Grewia  

Greyia  

Grindelia  

Griselina  

Gunnera (dinosaur food)  

Guzmania  

Gymnocalycium  

Gymnocarpium  

Gymnocladus  

Gynandriris  

Gynura  

Gypsophila  

Haageocereus  

Haastia  

Habenaria (an orchid genus)  

Haberlea  

Habranthus  

Hacquetia  

Haemanthus (blood lily)  

Hakea  

Hakonechloa  

Halesia (silverbell)  

Halimiocistus (hybrid genus)  

Halimium  

Halimodendron  

Hamamelis (witch-hazel)  

Haplopappus  

Hardenbergia (coral pea)  

Harrisia  

Hatiora  

Haworthia  

Hebe  

Hechtia  

Hedera (ivy)  

Hedychium  

Hedyotis (bluets)  

Hedysarum  

Hedyscepe (umbrella palm)  

Helenium (sneezeweed)  

Helianthemum (rock rose)  

Helianthus (sunflower)  

Helichrysum  

Heliconia  

Helictotrichon  

Heliocereus  

Heliophila  

Heliopsis (ox eye)  

Heliotropium (heliotrope)  

Helleborus (hellebore)  

Heloniopsis  

Hemerocallis (daylily)  

Hemigraphis  

Hepatica  

Heptacodium  

Heracleum  

Herbertia  

Hereroa  

Hermannia  

Hermodactylus  

Hesperaloe  

Hesperantha  

Hesperis  

Hesperocallis  

Heterocentron  

Heterotheca  

Heuchera (coral flower)  

Heucherella (hybrid genus)  

Hibbertia  

Hibiscus (hibiscus, rose of Sharon)  

Hieracium (hawkweed)  

Himalayacalamus  

Hippeastrum (amaryllis)  

Hippocrepis  

Hippophae  

Hohenbergia  

Hohenbergiopsis  

Hoheria  

Holboellia  

Holcus  

Holmskioldia  

Holodiscus  

Homalocladium (ribbon bush)  

Homeria  

Hoodia  

Hordeum (barley)  

Horminum  

Hosta (plantain lily)  

Hottonia  

Houttuynia  

Hovea  

Hovenia  

Howea (sentry palm)  

Hoya (wax flower)  

Huernia  

Hummemannia  

Humulus (hops)  

Huntleya  

Hyacinthella  

Hyacinthoides  

Hyacinthus (hyacinth)  

Hydrangea  

Hydrastis (goldenseal)  

Hydrocharis (frogbit)  

Hydrocleys  

Hydrocotyle (pennywort)  

Hygrophila  

Hylocereus  

Hylomecon  

Hymenocallis  

Hymenosporum  

Hyophorbe (bottle palm)  

Hyoscyamus (henbane)  

Hypericum (St. John's wort, rose of Sharon)  

Hyphaene (doum palm)  

Hypocalymma  

Hypoestes  

Hypoxis (starflower)  

Hypsela  

Hyssopus (hyssop)  

Iberis (candytuft)  

Ibervillea  

Idesia  

Ilex (holly)  

Illicium  

Impatiens (balsam)  

Imperata  

Incarvillea  

Indigofera  

Inula  

Iochroma  

Ipheion  

Ipomoea (morning glory)  

Ipomopsis  

Iresine  

Iris  

Isatis  

Isoplexis  

Isopyrum  

Itea  

Ixia (corn lily)  

Ixiolirion  

Ixora  

Jaborosa  

Jacaranda  

Jacquemontia  

Jamesia  

Jancaea  

Jasione  

Jasminum (jasmine, jessamine)  

Jatropha  

Jeffersonia  

Jovellana  

Jovibarba  

Juanulloa  

Jubaea (Chilean wine palm)  

Juglans (walnut)  

Juncus (rush)  

Juniperus (juniper)  

Justicia  

Kadsura  

Kaempferia  

Kalanchoe  

Kalimeris  

Kalmia (Mountain Laurel)  

Kalmiopsis  

Kalopanax  

Kelseya  

Kerria  

Kigelia (sausage tree)  

Kirengeshoma  

Kitaibela  

Kleinia  

Knautia  

Knightia  

Kniphofia  

Koeleria (junegrass)  

Koelreuteria (golden rain tree)  

Kohleria  

Kolkwitzia (beautybush)  

Kosteletzkya  

Kunzea  

Lablab  

Laburnocytisus  

Laburnum (laburnum)  

Laccospadix  

Lachenalia (Cape cowslip)  

Laelia (an orchid genus)  

Laeliocattleya (hybrid orchid genus)  

Lagarosiphon  

Lagerstroemia  

Lagunaria  

Lagurus  

Lamarckia  

Lambertia  

Lamium (deadnettle)  

Lampranthus  

Lantana (shrub verbena)  

Lapageria  

Lardizabala  

Larix (larch)  

Larrea (creosote bush)  

Latania (Latan palm)  

Lathraea  

Lathyrus  

Laurelia  

Laurus  

Lavandula (lavender)  

Lavatera (mallow)  

Lawsonia  

Layia  

Ledebouria  

Ledodendron (hybrid genus)  

Ledum  

Leea  

Legenophora  

Legousia  

Leiophyllum  

Leipoldtia  

Leitneria  

Lemboglossum  

Lenophyllum  

Leonotis  

Leontice  

Leontopodium (edelweiss)  

Lepidozamia  

Leptinella  

Leptodactylon  

Leschenaultia  

Lespedeza (bush clover)  

Leucadendron  

Leucanthemella  

Leucanthemopsis  

Leucanthemum  

Leuchtenbergia  

Leucocoryne  

Leucogenes  

Leucojum (snowflake)  

Leucophyllum  

Leucophyta  

Leucopogon  

Leucoraoulia (hybrid genus)  

Leucospermum (pincushion)  

Leucothoe  

Lewisia  

Leycesteria  

Leymus  

Liatris  

Libertia  

Libocedrus  

Ligularia  

Ligustrum (privet)  

Lilium (lily)  

Limnanthes  

Limnocharis  

Limonium (sea lavender)  

Linanthus  

Linaria (toadflax)  

Lindelofia  

Lindera  

Lindheimeria (star daisy)  

Linnaea (twinflower)  

Linospadix  

Linum (flax)  

Liquidambar (sweetgum)  

Liriodendron (tulip tree)  

Liriope (lilyturf)  

Lithocarpus  

Lithodora  

Lithophragma  

Lithops  

Littonia  

Livistona  

Lloydia  

Loasa  

Lobelia  

Lobularia (sweet alyssum)  

Lodoicea (coco-de-mer)  

Loiseleuria  

Lomandra (mat rush)  

Lomatia  

Lomatium  

Lomatophyllum  

Lonicera (honeysuckle)  

Lopezia  

Lophomyrtus  

Lophospermum  

Lophostemon  

Loropetalum  

Lotus  

Luculia  

Ludwigia  

Luma  

Lunaria  

Lupinus (lupin)  

Luzula (woodrush)  

Lycaste (an orchid genus)  

Lychnis (campion)  

Lycium  

Lycopodium (club moss)  

Lycoris  

Lygodium (climbing fern)  

Lyonia  

Lyonothamnus  

Lysichiton (Yellow skunk cabbage)  

Lysiloma  

Lysimachia  

Lythrum (loosestrife)  

Maackia  

Macfadyena  

Machaeranthera  

Mackaya  

Macleania  

Macleaya  

Maclura  

Macropidia  

Macrozamia  

Magnolia  

Mahonia  

Maianthemum (May lily)  

Maihuenia  

Malcolmia  

Malephora  

Malope  

Malpighia  

Malus (apple, crabapple)  

Malva (mallow)  

Malvastrum  

Malvaviscus  

Mammillaria  

Mandevilla  

Mandragora (mandrake)  

Manettia  

Manglietia  

Maranta  

Margyricarpus  

Marrubium (horehound)  

Marsilea (pepperwort)  

Masdevallia (an orchid genus)  

Matteuccia  

Matthiola (stock)  

Maurandella  

Maurandya  

Maxillaria (an orchid genus)  

Maytenus  

Mazus  

Meconopsis  

Medicago (alfalfa)  

Medinilla  

Meehania  

Megacodon  

Megaskepasma  

Melaleuca (paperbark)  

Melasphaerula  

Melastoma  

Melia  

Melianthus  

Melica (melick)  

Melicytus  

Melinis  

Meliosma  

Melissa (balm)  

Melittis (bastard balm)  

Melocactus  

Menispermum (moonseed)  

Mentha (mint)  

Mentzelia (starflower)  

Menyanthes  

Menziesia  

Merendera  

Merremia  

Mertensia  

Mespilus  

Metasequoia (dawn redwood)  

Metrosideros  

Meum  

Mexicoa  

Michauxia  

Michelia  

Microbiota  

Microcachrys  

Microlepia  

Micromeria  

Mikania  

Milium  

Milla  

Millettia  

Miltonia (an orchid genus)  

Miltoniopsis (pansy orchid)  

Mimetes  

Mimosa (mimosa, or sensitive plant)  

Mimulus (monkey flower)  

Mirabilis  

Miscanthus  

Mitchella (partridge berry)  

Mitella  

Mitraria  

Molinia  

Moltkia  

Moluccella  

Monadenium  

Monanthes  

Monarda (bee balm)  

Monardella  

Monstera  

Moraea  

Morina  

Morisia  

Morus (mulberry)  

Mucuna  

Muehlenbeckia  

Mukdenia  

Musa (banana, plantain)  

Muscari (grape hyacinth)  

Mussaenda  

Mutisia  

Myoporum  

Myosotidium  

Myosotis (forget-me-not)  

Myrica  

Myriophyllum (milfoil)  

Myrrhis (sweet cicely)  

Myrsine  

Myrteola  

Myrtillocactus  

Myrtus (myrtle)  

Nandina (heavenly bamboo)  

Narcissus (daffodil)  

Nasturtium (watercress)  

Nautilocalyx  

Nectaroscordium  

Neillia  

Nelumbo (lotus)  

Nematanthus  

Nemesia  

Nemopanthus (mountain holly)  

Nemophila  

Neobuxbaumia  

Neolitsea  

Neolloydia  

Neomarica  

Neoporteria  

Neoregelia  

Nepenthes (pitcher plant)  

Nepeta (catmint)  

Nephrolepis  

Nerine  

Nerium (oleander)  

Nertera  

Nicandra  

Nicotiana (tobacco)  

Nidularium  

Nierembergia  

Nigella  

Nipponanthemum  

Nolana  

Nomocharis  

Nopalxochia  

Nothofagus (southern beech)  

Notholirion  

Nothoscordum (false garlic)  

Notospartium  

Nuphar (spatterdock)  

Nymania  

Nymphaea (waterlily)  

Nymphoides (floating heart)  

Nyssa (tupelo)  

Obregonia  

Ochagavia  

Ochna  

Ocimum  

Odontioda (hybrid orchid genus)  

Odontocidium (hybrid orchid genus)  

Odontoglossum (an orchid genus)  

Odontonema  

Odontonia (hybrid orchid genus)  

Oemleria  

Oenanthe (water dropwort)  

Oenothera (evening primrose, sundrops)  

Olea (olive)  

Olearia (daisy bush)  

Olneya  

Olsynium  

Omphalodes (navelwort)  

Omphalogramma  

Oncidium (an orchid genus)  

Onoclea  

Ononis (restharrow)  

Onopordum  

Onosma  

Oophytum  

Ophiopogon (lilyturf)  

Ophrys (an orchid genus)  

Ophthalmophyllum  

Oplismenus  

Opuntia (prickly pears, chollas and many other cactus species)  

Orbea  

Orbeopsis  

Orchis (an orchid genus)  

Oreocereus  

Origanum (marjoram, oregano)  

Orixa  

Ornithogalum  

Ornithophora  

Orontium (golden club)  

Orostachys  

Oroya  

Ortegocactus  

Orthophytum  

Orthrosanthus  

Orychophragmus  

Oryza (rice)  

Osbeckia  

Osmanthus  

Osmarea  

Osmaronia  

Osmunda (royal fern)  

Osteomeles  

Osteospermum  

Ostrowskia (giant bellflower)  

Ostrya  

Othonna  

Ourisia  

Oxalis (shamrock, sorrel)  

Oxydendrum  

Ozothamnus  

Pachistima  

Pachycereus  

Pachycormus  

Pachycymbium  

Pachyphragma  

Pachyphytum  

Pachypodium  

Pachysandra  

Pachystachys  

Pachystegia  

Pachystima  

Pachyveria (hybrid genus)  

Paeonia (peony)  

Paliurus  

Pamianthe  

Panax (ginseng)  

Pancratium (sea lily)  

Pandanus (screw pine)  

Pandorea  

Panicum  

Papaver (poppy)  

Paphiopedilum (slipper orchid)  

Paradisea (paradise lily)  

Parahebe  

Paraquilegia  

Parkinsonia  

Parnassia  

Parochetus  

Parodia  

Paronychia  

Parrotia  

Parrotiopsis  

Parthenocissus  

Passiflora (granadilla, passionflower)  

Patersonia  

Patrinia  

Paulownia  

Paurotis  

Pavonia  

Pedilanthus  

Pediocactus  

Pelargonium (geranium)  

Pellaea  

Peltandra (arrow arum)  

Peltoboykinia  

Peltophorum  

Peniocereus  

Pennisetum  

Penstemon  

Pentachrondra  

Pentaglottis  

Pentas  

Peperomia  

Peraphyllum  

Pereskia  

Perezia  

Pericallis  

Perilla  

Periploca  

Pernettya (now included in Gaultheria)  

Perovskia  

Persea  

Persicaria (fleeceflower, knotweed)  

Petasites (butterbur, sweet coltsfoot)  

Petrea  

Petrocosmea  

Petrophile  

Petrophyton  

Petrophytum  

Petrorhagia  

Petroselinum (parsley)  

Petteria  

Petunia  

Phacelia  

Phaedranassa (queen lily)  

Phaius (an orchid genus)  

Phalaenopsis (moth orchid)  

Phalaris  

Phebalium  

Phegopteris (beech fern)  

Phellodendron (cork tree)  

Philadelphus (mock orange)  

Philageria (hybrid genus)  

Philesia  

Phillyrea  

Philodendron  

Phlebodium  

Phlomis  

Phlox  

Phoenix (date palm)  

Phormium  

Photinia  

Phragmipedium (an orchid genus)  

Phragmites (reed)  

Phuopsis  

Phygelius  

Phylica (Cape myrtle)  

Phylliopsis (hybrid genus)  

Phyllocladus (toatoa)  

Phyllodoce  

Phyllostachys  

Phyllothamnus (hybrid genus)  

Physalis (ground cherry)  

Physaria (bladderpod)  

Physocarpus  

Physoplexis  

Physostegia  

Phyteuma  

Phytolacca (pokeweed)  

Picea (spruce)  

Picrasma  

Pieris  

Pilea  

Pileosella  

Pileostegia  

Pilosocereus  

Pimelea  

Pimpinella  

Pinanga  

Pinckneya  

Pinellia  

Pinguicula (butterwort)  

Pinus (pine)  

Piper (pepper)  

Piptanthus  

Pisonia  

Pistacia (pistachio)  

Pistia  

Pitcairnia  

Pithecellobium  

Pittosporum  

Pityrogramma  

Plantago (plantain)  

Platanus (plane tree, sycamore)  

Platycarya  

Platycerium (staghorn fern)  

Platycladus (Chinese arborvitae)  

Platycodon (balloon flower)  

Platystemon (creamcups)  

Plectranthus  

Pleioblastus  

Pleione (an orchid genus)  

Pleiospilos (living granite)  

Pleurothallis (an orchid genus)  

Plumeria (frangipani)  

Poa  

Podalyria  

Podocarpus  

Podophyllum (mayapple)  

Podranea  

Polemonium (jacob's ladder, abscess root)  

Polianthes  

Poliothyrsis  

Polygala (milkwort, seneca, snakeroot)  

Polygonatum  

Polygonum (knotweed, knotgrass)  

Polypodium  

Polyscias  

Polystichum  

Poncirus  

Pongamia  

Pontederia (pickerel weed)  

Populus (aspen, poplar, cottonwood)  

Porana  

Portea  

Portulaca (purslane, moss rose)  

Portulacaria  

Posoqueria  

Potamogeton  

Potentilla (cinquefoil)  

Pothos  

Potinara (hybrid orchid genus)  

Pratia  

Primula (primrose)  

Prinsepia  

Pritchardia  

Proboscidea (unicorn plant)  

Promenaea  

Prosopis (mesquite)  

Prostanthera (mint bush)  

Protea  

Prumnopitys  

Prunella (self-heal)  

Prunus (almond, apricot, cherry, peach, plum)  

Pseuderanthemum  

Pseudocydonia  

Pseudolarix (golden-larch)  

Pseudopanax  

Pseudosasa  

Pseudotsuga (douglas-fir)  

Pseudowintera  

Psiolotum  

Psychopsis (butterfly orchid)  

Psylliostachys (statice)  

Ptelea  

Pteris (brake, table fern)  

Pterocactus  

Pterocarya (wingnut)  

Pteroceltis  

Pterocephalus  

Pterodiscus  

Pteropogon  

Pterostyrax  

Ptilotus  

Ptychosperma  

Pueraria  

Pulmonaria (lungwort)  

Pulsatilla  

Pultenaea  

Punica (pomegranate)  

Purshia  

Puschkinia  

Putoria  

Puya  

Pycnanthemum  

Pycnostachys  

Pyracantha (firethorn)  

Pyrola (wintergreen)  

Pyrostegia  

Pyrrosia  

Pyrus (pear)  

Quamoclit  

Quaqua  

Quercus (oak)  

Quesnelia  

Quisqualis  

Ramonda  

Ranunculus (buttercup, crowfoot)  

Ranzania  

Raoulia  

Raphia (raffia)  

Ratibida  

Ravenala (traveler's tree)  

Rebutia  

Rehderodendron  

Rehmannia  

Reineckia  

Reinwardtia  

Reseda (mignonette)  

Retama  

Rhamnus  

Rhaphidophora  

Rhaphiolepis  

Rhapidophyllum (needle palm)  

Rhapis (lady palm)  

Rheum (rhubarb)  

Rhexia  

Rhipsalis  

Rhodanthemum  

Rhodanthe (strawflower)  

Rhodiola  

Rhodochiton  

Rhododendron  

Rhodohypoxis  

Rhodophiala  

Rhodothamnus  

Rhodotypos  

Rhoeo  

Rhoicissus  

Rhombophyllum  

Rhus (sumac)  

Rhynchelytrum  

Rhynchostylis (an orchid genus)  

Ribes (currant)  

Richea  

Ricinus (castor-oil plant)  

Rigidella  

Robinia  

Rochea  

Rodgersia  

Rodriguezia  

Rohdea  

Romanzoffia  

Romneya (Matilija poppy, tree poppy)  

Romulea  

Rondeletia  

Rosa (rose)  

Roscoea  

Rosmarinus (rosemary)  

Rossioglossum  

Rothmannia  

Roystonea (royal palm)  

Rubus (raspberry)  

Rudbeckia (coneflower)  

Ruellia  

Rumex (dock)  

Rumohra  

Rupicapnos  

Ruschia  

Ruscus  

Russelia  

Ruta (rue)  

Sabal (palmetto)  

Saccharum (plume grass, sugar cane)  

Sadleria  

Sagina (pearlwort)  

Sagittaria (arrowhead)  

Saintpaulia (African violet)  

Salix (willow)  

Salpiglossus  

Salvia (sage)  

Salvinia  

Sambucus (elder)  

Sanchezia  

Sandersonia  

Sanguinaria (bloodroot)  

Sanguisorba (burnet)  

Sansevieria  

Santolina  

Sanvitalia (creeping zinnia)  

Sapindus  

Sapium (tallow tree)  

Saponaria (soapwort)  

Sarcocapnos  

Sarcocaulon  

Sarcococca  

Saritaea  

Sarmienta  

Sarracenia (pitcher plant)  

Sasa  

Sassafras  

Satureja (savory)  

Sauromatum  

Saxegothaea  

Saxifraga (saxifrage)  

Scabiosa (scabious plant)  

Scadoxus (blood lily)  

Scaevola  

Schefflera  

Schima  

Schinus  

Schisandra  

Schizachyrium  

Schizanthus  

Schizopetalon  

Schizophragma  

Schizostylis  

Schlumbergera  

Schoenoplectus  

Schomburgkia  

Schotia  

Schwantesia  

Sciadopitys  

Scilla  

Scindapsus  

Scirpoides  

Sclerocactus  

Scoliopsus  

Scopolia  

Scrophularia (figwort)  

Scutellaria  

Securinega