Silphium asteriscus var. asteriscus [Asteraceae]

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Scientific Name Silphium asteriscus var. asteriscus (Silphium asperrimum) USDA PLANTS Symbol SIASA3
Common Name Starry Rosinweed ITIS Taxonomic Serial No. 38388
Family Asteraceae (Sunflower) SEINet
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Description Habitat: Various soil types near waterways, in ditches and pastures, along railroads and roadsides.
Plant: Erect perennial 20 to 48 inches tall, one or a few branches from base.
Leaves: Lanceolate or narrowly elliptic to ovate or broadly ovate, usually tapered to a pointed tip and tapered at the base; 4-3/4 to 10 inches long; lower stem leaves alternate and petiolate, upper leaves either opposite or alternate and sessile; short hairs on surfaces and entire or finely to coarsely toothed margins.
Inflorescence: Solitary or a tight cluster of a few large, bright yellow composite flowers; 3 or more inches across, 8 to 20 rays and 35 or more disk florets; involucre with hairy, wide, elliptic to ovate overlapping bracts, spreading to slightly recurved with sharply pointed tips.
Bloom Period: Summer and fall.
References: "Wildflowers of Texas" by Michael Eason, Silphium asperrimum in "Manual of the Vascular Plants of Texas" by Correll and Johnston, Flora of North America and Missouri Plants.
BONAP Distribution Map

Texas Status:

© Tom Lebsack 2022