Vascular Plants of North Carolina
Account for Starry Rosinweed - Silphium asteriscus var. dentatum   (Elliott) Chapman
Members of Silphium with account distribution info or public map:
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Section 6 » Family Asteraceae
Author(Elliott) Chapman
DistributionMostly Piedmont, scattered in low Mountains.

NC to TN, south to FL and AL.
AbundanceRare to locally common.
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 and Weakley, 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 (surrounding 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 has 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 *
Global RankG5TNR
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BA SorriePiedmont of Moore, area of Iredell Soil E of Carbonton Road MoorePhoto_natural
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