| Common name | Botanical name |
| 1. Kadambu | Anthocephalus cadamba Anthocephalus chinensis |
| 2. Kaffir Lily | Clivia miniata |
| 3. Kaffir Lime | Citrus hystrix |
| 4. Kahili | Hedychium gardnerianum |
| 5. Kai apple or Kau Apple | Aberia caffra |
| 6. Kalamona | Cassia gaudichaudii Cassia glauca |
| 7. Kalanchoe | Kalanchoe |
| 8. Kale | Brassica oleracea var. sabellica |
| 9. Kamala dye tree | Mallotus philippensis |
| 10. Kambli | Euodia lunu-ankenda |
| 11. Kangaroo Apple, Tasmanian | Solanum laciniatum |
| 12. Kangaroo Paws | Anigozanthos manglesii |
| 13. Kangaroo Vine | Cissus antarctica |
| 14. Kantikari | Solanum xanthocarpum |
| 15. Kapok | Ceiba pentandra |
| 16. Kapoor ghas | Themeda gigantia |
| 17. Karani | Cullenia exarillata |
| 18. Karaveeram | Nerium odorum N. indicum |
| 19. Karit | Cucumis trigonis |
| 20. Karonda | Carissa carandas |
| 21. Kashmir Tree Mallow | Lavatera cachmeriana |
| 22. Kashmirian Sage | Phlomis cashmiriana |
| 23. Kasi | Bridelia retusa Spreng. |
| 24. Katsura Tree | Cercidiphyllum japonicum |
| 25. Kau-pau | Ligusticum chinensis |
| 26. Kava Kava | Piper methysticum |
| 27. Kelp | Alaria esculenta Laminaria angustata Laminaria japonica Laminaria longicruris Laminaria longissima Laminaria ochotensis Macrocystis pyrifera Nereocystis luetkeana Pleurophycus gardneri |
| 28. Kempas | Koompassia malaccensis Maing |
| 29. Kentucky Coffee Tree | Gymnocladus dioica |
| 30. Kentucky Hemp | Urtica canadensis Urtica cannabina |
| 31. Khat | Catha edulis |
| 32. Kidneywort | Cotyledon umbilicus |
| 33. Killarney Strawberry Tree | Arbutus unedo |
| 34. Kindal | Terminalia paniculata |
| 35. King Wormwood, Silver | Artemisia ludoviciana var. albula |
| 36. Kingfisher Daisy | Felicia bergeriana |
| 37. Kino, African | Pterocarpus erinaceus |
| 38. Kino, Jamaica | Coccoloba uvifera |
| 39. Kiwi fruit | Actinidia chinensis Actinidia deliciosa |
| 40. Knapweed, Black | Centaurea nigra |
| 41. Knapweed, Mountain | Centaurea montana |
| 42. Knapweed, Pink | Centaurea pulcherrima |
| 43. Knapwort Harshweed | Centaurea jacea |
| 44. Kneeling Angelica | Angelica genuflexa |
| 45. Knobbed Wrack | Fucus nodosus |
| 46. Knotgrass Russian | Polygonum erectum |
| 47. Knotweed | Polygonum aviculare |
| 48. Knotweed, Alpine | Polygonum viviparum |
| 49. Knotweed, Red | Polygonum macrophyllum |
| 50. Knotweed, White | Aconogonon weyrichii |
| 51. Knoxia | Knoxia corymbosa |
| 52. Kohl Rabi | Brassica oleracea var. gongylodes |
| 53. Kokko or Kala siris | Albizia lebbeck Albizzia odorattisima |
| 54. Kola Nuts | Cola vera |
| 55. Kongu | Hopea utilis (Bedd.) Bole |
| 56. Kousa Dogwood | Cornus kousa |
| 57. Kousso | Brayera anthelmintica Hagenia abyssinica |
| 58. Kudzu vine | Pachyrhizus thunbergianus Pueraria lobata Pueraria thunbergiana |
| 59. Kumbi | Careya arborea |
| 60. Kusia | Nauclea diderrichii Merrill. |
| 61. Kusum | Schleichera oleosa |
| 62. Kuthan | Hymenodictyon excelsum |
| 63. Kuwa | Morus alba var. stylosa |
| 64. Kydia | Kydia calycina |