| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| KEEF | Keerlia effusa Gray | Chaetopappa effusa | Asteraceae
|
| KESK | Keerlia skirrhobasis DC. | Aphanostephus skirrhobasis var. skirrhobasis | Asteraceae
|
| KEGA | Kelloggia galioides Torr. | milk kelloggia | Rubiaceae
|
| KELLO | Kelloggia Torr. ex Benth. | kelloggia | Rubiaceae
|
| KEUN | Kelseya uniflora (S. Wats.) Rydb. | oneflower kelseya | Rosaceae
|
| KELSE | Kelseya (S. Wats.) Rydb. | kelseya | Rosaceae
|
| KERU3 | Kentranthus ruber (L.) DC. in Lam. & DC. | Centranthus ruber | Valerianaceae
|
| KEMO | Kentrophyta montana Nutt. | Astragalus kentrophyta var. kentrophyta | Fabaceae
|
| KEJA | Kerria japonica (L.) DC. | Japanese rose | Rosaceae
|
| KERRI | Kerria DC. | kerria | Rosaceae
|
| KEGE | Kerstingiella geocarpa Harms | Macrotyloma geocarpum | Fabaceae
|
| KEEV | Keteleeria evelyniana Mast. | Evelyn keteleeria | Pinaceae
|
| KETEL | Keteleeria Carri�re | keteleeria | Pinaceae
|
| KEER | Keysseria erici (Forbes) Cabrera | Lagenifera erici | Asteraceae
|
| KEHE | Keysseria helenae (Forbes & Lydgate) Cabrera | Lagenifera helenae | Asteraceae
|
| KELA | Keysseria lavandula St. John | Lagenifera maviensis | Asteraceae
|
| KEMA | Keysseria maviensis (Mann) Cabrera | Lagenifera maviensis | Asteraceae
|
| KHNY2 | Khaya nyasica Stapf ex E.G. Baker | Nyasaland mahogany | Meliaceae
|
| KHSE2 | Khaya senegalensis (Desr.) A. Juss. | Senegal mahogany | Meliaceae
|
| KHAYA2 | Khaya A. Juss. | African mahogany | Meliaceae
|
| KIBLH | Kiaeria blyttii (Schimp.) Broth. var. hispidula (Williams) Wijk & Marg. | Kiaeria blyttii | Dicranaceae
|
| KIBL | Kiaeria blyttii (Schimp.) Broth. | Blytt's kiaeria moss | Dicranaceae
|
| KIFAP | Kiaeria falcata (Hedw.) Hag. var. pumila (Saut.) Podp. | Kiaeria falcata | Dicranaceae
|
| KIFA | Kiaeria falcata (Hedw.) Hag. | sickle kiaeria moss | Dicranaceae
|
| KIGL | Kiaeria glacialis (Berggr.) Hag. | glacial kiaeria moss | Dicranaceae
|
| KIST | Kiaeria starkei (Web. & Mohr) Hag. | Starke's kiaeria moss | Dicranaceae
|
| KIAER | Kiaeria Hag. | kiaeria moss | Dicranaceae
|
| KIEL | Kickxia elatine (L.) Dumort. | sharpleaf cancerwort | Scrophulariaceae
|
| KISP | Kickxia spuria (L.) Dumort. | roundleaf cancerwort | Scrophulariaceae
|
| KICKX | Kickxia Dumort. | cancerwort | Scrophulariaceae
|
| KIAF | Kigelia africana (Lam.) Benth. | sausage tree | Bignoniaceae
|
| KIPI | Kigelia pinnata (Jacq.) DC. | Kigelia africana | Bignoniaceae
|
| KIGEL | Kigelia DC. | sausage tree | Bignoniaceae
|
| KIAT | Kiliasia athallina (Hepp) Hafellner | Toninia athallina | Catillariaceae
|
| KIPH | Kiliasia philippea (Mont.) Hafellner | Toninia philippea | Catillariaceae
|
| KIBR | Kindbergia brittoniae (Grout) Ochyra | Eurhynchium praelongum | Brachytheciaceae
|
| KIOR | Kindbergia oregana (Sull.) Ochyra | Eurhynchium oreganum | Brachytheciaceae
|
| KIPRC | Kindbergia praelonga (Hedw.) Ochyra var. californica (Grout) Ochyra | Eurhynchium praelongum | Brachytheciaceae
|
| KIPRS | Kindbergia praelonga (Hedw.) Ochyra var. stokesii (Turn.) Ochyra | Eurhynchium praelongum | Brachytheciaceae
|
| KIPR | Kindbergia praelonga (Hedw.) Ochyra | Eurhynchium praelongum | Brachytheciaceae
|
| KINDB | Kindbergia Ochyra | kindbergia | Brachytheciaceae
|
| KIAC | Kirschsteiniothelia acerina (Rossman & Wilcox) D. Hawksw. | | Pleosporaceae
|
| KIAE | Kirschsteiniothelia aethiops (Berk. & Curtis) D. Hawksw. | | Pleosporaceae
|
| KIMA | Kirschsteiniothelia maritima (Linder) D. Hawksw. | | Pleosporaceae
|
| KIRE | Kirschsteiniothelia recessa (Cooke & Peck) D. Hswksw. | | Pleosporaceae
|
| KITH | Kirschsteiniothelia thujina (Peck) D. Hawksw. | | Pleosporaceae
|
| KIRSC | Kirschsteiniothelia D. Hawksw. | kirschsteiniothelia | Pleosporaceae
|
| KLHO | Kleinhovia hospita L. | guest tree | Sterculiaceae
|
| KLEIN | Kleinhovia L. | kleinhovia | Sterculiaceae
|
| KLGL | Kleinia glandulosa Moc. & Sess� | Porophyllum ruderale ssp. macrocephalum | Asteraceae
|
| KLRU | Kleinia ruderalis Jacq. | Porophyllum ruderale ssp. ruderale | Asteraceae
|
| KNAR | Knautia arvensis (L.) Coult. | field scabiosa | Dipsacaceae
|
| KNAUT | Knautia L. | scabiosa | Dipsacaceae
|
| KNAL | Kneiffia allenii (Britt.) Small | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNAR2 | Kneiffia arenicola Small | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNBR | Kneiffia brevistipata (Pennell) Munz | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNFR | Kneiffia fruticosa (L.) Raimann | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNGL | Kneiffia glauca (Michx.) Spach | Oenothera fruticosa ssp. glauca | Onagraceae
|
| KNHY | Kneiffia hybrida (Michx.) Small | Oenothera fruticosa ssp. glauca | Onagraceae
|
| KNLA | Kneiffia latifolia Rydb. | Oenothera fruticosa ssp. glauca | Onagraceae
|
| KNLI | Kneiffia linearis (Michx.) Spach | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNLI2 | Kneiffia linifolia (Nutt.) Spach | Oenothera linifolia | Onagraceae
|
| KNLO | Kneiffia longipedicellata Small | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNPE | Kneiffia perennis (L.) Pennell | Oenothera perennis | Onagraceae
|
| KNPR | Kneiffia pratensis Small | Oenothera pilosella ssp. pilosella | Onagraceae
|
| KNPU | Kneiffia pumila (L.) Spach | Oenothera perennis | Onagraceae
|
| KNRI | Kneiffia riparia (Nutt.) Small | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNSE | Kneiffia semiglandulosa Pennell | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNSU | Kneiffia subglobosa Small | Oenothera fruticosa ssp. fruticosa | Onagraceae
|
| KNSU2 | Kneiffia sumstinei Jennings | Oenothera pilosella ssp. pilosella | Onagraceae
|
| KNTE | Kneiffia tetragona (Roth) Pennell | Oenothera fruticosa ssp. glauca | Onagraceae
|
| KNUV80 | Kniphofia uvaria (L.) Oken | redhot poker | Liliaceae
|
| KNIPH | Kniphofia Moench | redhot poker | Liliaceae
|
| KODO | Koanophyllon dolicholepis (Urban) King & H.E. Robins. | oreganillo | Asteraceae
|
| KODR2 | Koanophyllon droserolepis (B.L. Robins.) King & H.E. Robins. | Monte Torrecilla thoroughwort | Asteraceae
|
| KOPO | Koanophyllon polyodon (Urban) King & H.E. Robins. | islandthicket thoroughwort | Asteraceae
|
| KOSO | Koanophyllon solidaginifolium (Gray) King & H.E. Robins. | shrubby thoroughwort | Asteraceae
|
| KOVI2 | Koanophyllon villosum (Sw.) King & H.E. Robins. | Florida Keys thoroughwort | Asteraceae
|
| KOANO2 | Koanophyllon Arruda | thoroughwort | Asteraceae
|
| KOBEM | Kobresia bellardii (All.) K. Koch var. macrocarpa (Clokey ex Mackenzie) Harrington | Kobresia sibirica | Cyperaceae
|
| KOBE | Kobresia bellardii (All.) K. Koch | Kobresia myosuroides | Cyperaceae
|
| KOBI | Kobresia bipartita (All.) Dalla Torre | Kobresia simpliciuscula | Cyperaceae
|
| KOEL2 | Kobresia elachycarpa (Fern.) Fern. | Carex sterilis | Cyperaceae
|
| KOHYA | Kobresia hyperborea Porsild var. alaskana Duman | Kobresia sibirica | Cyperaceae
|
| KOHY | Kobresia hyperborea Porsild | Kobresia sibirica | Cyperaceae
|
| KOMA3 | Kobresia macrocarpa Clokey ex Mackenzie | Kobresia sibirica | Cyperaceae
|
| KOMY | Kobresia myosuroides (Vill.) Fiori | Bellardi bog sedge | Cyperaceae
|
| KOSCL | Kobresia schoenoides (C.A. Mey.) Steud. var. lepagei (Duman) Boivin | Kobresia sibirica | Cyperaceae
|
| KOSC2 | Kobresia schoenoides (C.A. Mey.) Steud. p.p. | Kobresia sibirica | Cyperaceae
|
| KOSI | Kobresia sibirica (Turcz. ex Ledeb.) Boeckl. | Siberian bog sedge | Cyperaceae
|
| KOSIA | Kobresia simpliciuscula (Wahlenb.) Mackenzie var. americana Duman | Kobresia simpliciuscula | Cyperaceae
|
| KOSI2 | Kobresia simpliciuscula (Wahlenb.) Mackenzie | simple bog sedge | Cyperaceae
|
| KOBRE | Kobresia Willd. | bog sedge | Cyperaceae
|
| KOAL3 | Kochia alata Bates | Kochia scoparia | Chenopodiaceae
|
| KOAMC | Kochia americana S. Wats. var. californica (S. Wats.) M.E. Jones | Kochia californica | Chenopodiaceae
|
| KOAMV | Kochia americana S. Wats. var. vestita S. Wats. | Kochia americana | Chenopodiaceae
|
| KOAM | Kochia americana S. Wats. | green molly | Chenopodiaceae
|
| KOAT2 | Kochia atriplicifolia Spreng. | Cycloloma atriplicifolium | Chenopodiaceae
|
| KOCA | Kochia californica S. Wats. | rusty molly | Chenopodiaceae
|
| KOHI | Kochia hirsuta (L.) Nolte | Bassia hirsuta | Chenopodiaceae
|
| KOHY3 | Kochia hyssopifolia (Pallas) Schrad. | Bassia hyssopifolia | Chenopodiaceae
|