Kalithea Orchid 
Kaths sun orchid 
Keeled Garlic 
Kefersteinia tolimensis 
King Uzziae Iris 
King's Spear 
Kniphofia linearifolia 
Krantz aloe 
Lace Aloe 
Lacelip Ladies' Tresses 
Lady of the night 
Lady orchid 
Lankesteriana barbulata 
Large bird orchid 
Large Mosquito Orchid 
Large Striped Greenhood 
Large tongue orchid 
Large Twayblade 
Large-flowered sobralia 
Largeflower triteleia 
Late donkey orchid 
Lawrence's Paphiopedilum 
Leafy purple-flag 
Lebanese garlic