Silphium asteriscus var. asteriscus
(Starry Rosinweed)
Silphium asteriscus var. asteriscus, Garner State Park, Uvalde Co. 4113
Silphium asteriscus var. asteriscus, Garner State Park, Uvalde Co. 4126
Silphium asteriscus var. asteriscus, Garner State Park, Uvalde Co. 4121
Silphium asteriscus var. asteriscus, Garner State Park, Uvalde Co. 4644
| 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 Reference |
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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, Flora of North America and Missouri Plants; Silphium asperrimum in "Manual of the Vascular Plants of Texas" by Correll and Johnston. |
BONAP Distribution Map Map Color Key |
Texas Status: Native Endemic |
Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County
© Tom Lebsack 2024