Organic | Scientific name | Common name | Part | Origin |
| Kaempferia galanga L | Galangal | tuber | SE Asia |
| Kalanchoe pinnata (Lam) Pers | Air plant, Cathedral bells | leaf | C-America |
| Kalmia latifolia L | Calico Bush | | |
| Kefersteinia expansa | | | Ecuador |
| Kefersteinia graminea | | | Ecuador |
| Kefersteinia lactea | | | Ecuador |
| Kefersteinia laminata | | | Ecuador |
| Kefersteinia lojae | | | Ecuador |
| Kefersteinia mystacina | | | Ecuador |
| Kefersteinia pellita | | | Ecuador |
| Kefersteinia pulchella | | | Ecuador |
| Kefersteinia sanguinolenta | | | Ecuador |
| Kefersteinia taggesellii | | | Ecuador |
| Kefersteinia tolimensis | | | Ecuador |
| Khaya senegalensis (Desr) A Juss | African Mahogany | stem bark | Africa |
| Khaya senegalensis (Desr) A Juss | | | W-Africa |
| Kigelia africana (Lam) Benth | Sausage Tree | fruit | W-Africa |
| Kochia scoparia (L) Schrad (syn Bassia scoparia) | Belvedere Scott | fruit | China |
| Koellensteinia graminea | | | Ecuador |
| Kraenzlinella anfracta | | | Ecuador |
| Kraenzlinella gigantea type | | | Ecuador |
| Kraenzlinella lappago | | | Ecuador |
| Krameria lappacea (Dombey) Burdet & B BSimpson | Rhatany Root | root | S-America |
| Krameria triandra Ruiz & Pav (syn Krameria lappacea Root | Rhatany (Dombey) | | S-America |