1. Perennial with sharply toothed triangular leaves on leafy stems bearing a cluster of yellow flower heads; moist places in mountains of western North America
   - arrowleaf groundsel

Type of: wild flower, wildflower

• genus Lobelia
• genus Lobipes
• genus Lobotes
• genus Lobularia
• genus Locusta
• genus Lofortyx
• genus Logania
• genus Loiseleuria
• genus Loligo
• genus Lolium
• genus Lomatia
• genus Lomogramma
• genus Lonas
• genus Lonchocarpus
• genus Lonicera
• genus Lophius
• genus Lophodytes
• genus Lopholatilus
• genus Lophophora
• genus Lophophorus
• genus Lophosoria
• genus Loranthus
• genus Loris
• genus Lota
• genus Lotus