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Silphium Linnaeus. Rosinweed.

Contributed by Mason Brock and Alan Weakley

Key to Silphium

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.

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Show species in Silphium

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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.

image of plant© Alan M. Cressler | Silphium terebinthinaceum | Original Image ⭷
image of plant© Gary P. Fleming | Silphium compositum var. compositum | Original Image ⭷
image of plant© Sonnia Hill | Silphium albiflorum | Original Image ⭷
image of plant© Gary P. Fleming | Silphium asteriscus var. trifoliatum | Original Image ⭷
image of plant© Gary P. Fleming | Silphium perfoliatum | Original Image ⭷
image of plant© Gary P. Fleming | Silphium reniforme | Original Image ⭷
image of plant© Richard & Teresa Ware | Silphium terebinthinaceum CC-BY-NC, permission granted to NCBG | Original Image ⭷

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See something wrong or missing on about Silphium? Let us know here: (Please include your name and email if at all complicated so we can clarify if needed.) We greatly appreciate feedback, and will include updates from you in our next webapp update, which can take a few months.