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Genus Senecio
- enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weeds
Genus Scorzonera
- genus of narrow-leaved European herbs
Genus Sericocarpus
- small genus of herbs of the eastern United States: white-topped asters
Genus Seriphidium
- woody plants grown chiefly for their silver or grey and often aromatic foliage; formerly included in the genus Artemisia
Genus Serratula
- genus of Old World perennial herbs with spirally arranged toothed leaves
Genus Silphium
- tall North American perennial herbs
Genus Silybum
- small genus of east African herbs
Genus Stenotus
- genus of western North American low evergreen shrubs growing in dense tufts