Lasiopogon muscoides 
Late boneset 
Late Goldenrod 
Launaea angustifolia 
Launaea arborescens 
Launaea capitata 
Launaea mucronata 
Launaea spinosa 
Lavender-Cotton 
Layia glandulosa 
Leafy fleabane 
lemon scented tarplant 
Leontodon asperrimus 
Leopard's Bane 
Leopard's-Bane 
Lesser burdock 
Lessingia leptoclada 
Lessingianthus bardanoides 
Leucophyta 
Lilac Tasselflower 
Lindley's Aster 
Linochilus eriophorus 
Lion's-foot Rattlesnake-root 
Little pickles