Vascular Plants of North Carolina
Account for Starry Rosinweed - Silphium asteriscus var. asteriscus   L.
Members of Asteraceae:
Members of Silphium with account distribution info or public map:
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Section 6 » Order Asterales » Family Asteraceae
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DistributionMostly Piedmont, scattered in low Mountains; disjunct to outer Coastal Plain: Craven Co., "roadside, US 70, Dover" in 1966; and Pender Co., "causeway across swamp forest, Northeast Cape Fear River near Rocky Point" in 1950.

VA to MO and OK, south to FL and TX.
AbundanceCommon in the Piedmont, rare in the Mountains and Coastal Plain.
HabitatDry to mesic woodlands and forest openings, clearings, clearcuts, roadside banks, fields, pastures.
PhenologyFlowering and fruiting late June-September.
IdentificationThe Silphium asteriscus complex consists of 5 varieties, according to FNA, 4 of which occur in NC. Plants grow mostly 3-5 feet tall, with lance-shaped to ovate leaves and a rather small inflorescence of nearly erect branches terminating in yellow heads. Basal leaves are absent at flowering time. The involucral bracts (at the base of each head) are broad, rounded, and thick-textured; thus they differ strongly from bracts of sunflowers (Helianthus). Variety asteriscus and var. dentatum have rough surfaces to leaves (vs. smooth in var. latifolium). Variety asteriscus may have tiny hairs on the pales (tiny bracts at the base of each disk floret), but these lack glands (vs. glandular-hairy in var. dentatum).
Taxonomic CommentsMost NC specimens were annotated by J.A. Clevinger in 1999, who studied this species complex.

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State RankS3? [S4]
Global RankG5TNR
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B.A. SorriePiedmont, Carbonton Road N of Haw Branch Road. 9 July 2018. MoorePhoto_natural
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