Helianthus angustifolius
(Swamp Sunflower)
Helianthus angustifolius, Scrappin’ Valley, Newton Co. 3781
Helianthus angustifolius, Scrappin’ Valley, Newton Co. 3770
Helianthus angustifolius, Scrappin’ Valley, Newton Co. 3773
Helianthus angustifolius, Scrappin’ Valley, Newton Co. 3776
| Scientific Name | Helianthus angustifolius | USDA PLANTS Symbol | HEAN2 |
| Common Name | Swamp Sunflower, Narrowleaf Sunflower | ITIS Taxonomic Serial No. | 502919 |
| Family | Asteraceae (Sunflower) | SEINet Reference |
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| Description | Habitat: Damp to wet soils in marshes, woodlands, and roadsides. Plant: Tall, erect, branching perennial, 3 to 5-1/2 ft. tall; somewhat hairy stems. Leaves: Mostly stem leaves, opposite or alternate; blades are narrowly lanceolate to linear, 3 to 6 inches long and 1/8 to 3/8-inch wide; sessile or nearly so; edges are entire, revolute; upper surface with stiff hairs, lower surfaces gland-dotted. Inflorescence: Bright yellow composite flower heads on peduncles 2 to 6 inches long, each head about 2 inches across with 10 to 20 rays and many dark brown disk florets; hemispherically-shaped involucres with 25 to 32 loose lanceolate phyllaries having rough, gland-dotted surfaces. Bloom Period: September to November. References: "Wildflowers of the Texas Hill Country" by Marshall Enquist, "Wildflowers of Texas" by Michael Eason and Flora of North America. |
BONAP Distribution Map Map Color Key |
Texas Status: Native |
Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County
© Tom Lebsack 2024