Science magazines
- Kohe Malama Malama O Kanaloa
- Koki'o (Kokia drynarioides)
- Koki'o (Kokia kauaiensis)
- Koki'o Ke'oke'o (Hibiscus arnottianus ssp. immaculatus)
- Koki'o Ke'oke'o (Hibiscus waimeae ssp. hannerae)
- Kolea (Myrsine juddii)
- Kolea (Myrsine linearifolia)
- Kopa
- Kral's Water-plantain
- Kretschmarr Cave Mold Beetle
- Kuahiwi Laukahi (Plantago hawaiensis)
- Kuahiwi Laukahi (Plantago princeps)
- Kuawawaenohu
- Kuenzler Hedgehog Cactus
- Kula Wahine Noho
- Kulu'i
- La Graciosa Thistle
- Lacy Elimia
- Laguna Beach Liveforever
- Laguna Mountains Skipper