Silphium Linnaeus. Rosinweed.
Contributed by Mason Brock and Alan Weakley
A genus of 20-30 species, herbs, of e. North America.
Key advice:The taxonomic treatment is more than usually problematic; it needs considerable additional work in the field and herbarium, and will likely be substantially modified in the future. Pales are receptacular bracts which subtend all or some of the disc florets of capitulum. They differ from phyllaries in that they subtend individual florets atop the receptacle vs. phyllaries which subtend the entire head of flowers. They are present within some, but not all, Asteraceae genera, and are most common in the Heliantheae tribe.
Ref: Clevinger (2004); Clevinger (2006) In Flora of North America Editorial Committee (2006c); Cronquist (1980); Cruden (1962); Medley (1989); Perry (1937); Steyermark (1951); Sweeney (1970). Show full citations.
Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.
© Alan M. Cressler | Silphium terebinthinaceum | Original Image ⭷
© Gary P. Fleming | Silphium compositum var. compositum | Original Image ⭷
© Gary P. Fleming | Silphium asteriscus var. trifoliatum | Original Image ⭷
© Gary P. Fleming | Silphium perfoliatum | Original Image ⭷
© Gary P. Fleming | Silphium reniforme | Original Image ⭷
© Richard & Teresa Ware | Silphium terebinthinaceum CC-BY-NC, permission granted to NCBG | Original Image ⭷Feedback
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