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Genus Raoulia
- genus of low-growing mat-forming New Zealand plants; in some classifications includes species placed in genus Haastia
Genus Ratibida
- genus of perennial wildflowers of North American plains and prairies; often cultivated for their showy flower heads
Genus Rhodanthe
- genus of xerophytic herbs and shrubs of South Africa and Australia; sometimes included in genus Helipterum
Genus Rudbeckia
- North American perennial herbs with showy cone-shaped flower heads
Genus Santolina
- genus of Mediterranean subshrubs with rayless flower heads
Genus Sanvitalia
- small genus of tropical American annual herbs: creeping zinnia
Genus Saussurea
- genus of herbs of temperate and cool regions of Eurasia
Genus Scolymus
- small genus of thistlelike herbs of the Mediterranean region
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