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Silphium radula

Family: asteraceae
Common name(s): Roughstem Rosinweed
Hardiness ratings: USDA zone 6 - 9

General resources

• Wikipedia. Online encyclopedia entry (if defined).
• Google images. Web search for photographs.
• The Plant List. Taxonomical lookup
• Catalogue of Life. Taxonomical lookup
• Dave's Garden. Search the extensive PlantFiles database.

Links for Silphium radula

• Garden.org - Community-assembled plant profile (10 photos)
• Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (37 photos)
• Native Plants of Central Texas - Photos with brief comments from University of Texas at Austin. (5 photos)
• Plant Delights Nursery - Catalog page with photo, horticultural basics, and descriptive blurb. (zone 6-9) (1 photo)

Silphium radula var. gracile

Common name(s): Rosinweed Sunflower

Links

• Native Plant Society of Texas - Plant profile with basic characteristics, some horticultural information, and a distribution map within Texas. (2 photos)