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Genus Lactuca
- an herb with milky juice: lettuce; prickly lettuce
Genus Lagenophera
- small genus of herbs of Australia and South America having small solitary white or purple flowers similar to true daisies of genus Bellis
Genus Lasthenia
- small genus of herbs of Pacific coast of North and South America
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