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Genus Layia
- genus of western United States annuals with showy yellow or white flowers
Genus Leucanthemum
- comprises plants often included in the genus Chrysanthemum
Genus Liatris
- genus of perennial North American herbs with aromatic usually cormous roots
Genus Ligularia
- genus of Old World herbs resembling groundsel: leopard plants
Genus Lonas
- one species: yellow ageratum
Genus Machaeranthera
- wildflowers of western North America