Texas Wildbuds

Asclepias tuberosa ssp. interior

(Butterfly Milkweed)

Asclepias tuberosa ssp. interior, Bastrop State Park, Bastrop Co. 5817

Asclepias tuberosa ssp. interior, Bastrop State Park, Bastrop Co. 5816

Asclepias tuberosa ssp. interior, Buescher State Park, Bastrop Co. 5975

Asclepias tuberosa ssp. interior, Bastrop State Park, Bastrop Co. 5814

Asclepias tuberosa ssp. interior, Bastrop State Park, Bastrop Co. 5798

Asclepias tuberosa ssp. interior, Bastrop State Park, Bastrop Co. 5801

Asclepias tuberosa ssp. interior, Buescher State Park, Bastrop Co. 5977

Asclepias tuberosa ssp. interior, Buescher State Park, Bastrop Co. 6691

Scientific Name	Asclepias tuberosa ssp. interior	USDA PLANTS Symbol	ASTUI
Common Name	Butterfly Milkweed, Butterfly Weed	ITIS Taxonomic Serial No.	30315
Family	Apocynaceae (Dogbane)	SEINet Reference	Click Here
Description	Habitat: Various soils in fields, prairies, thickets, open woods, canyons and hillsides. Plant: Leafy perennial with ascending, erect, or arched stems 6 to 36 inches tall, often branched near the inflorescence; densely hairy stems. Leaves: Mostly alternate, crowded, and variable in shape, elliptic, oblong, or oblanceolate to lanceolate or linear, 3/4 to 4-3/4 inches long and 1/8 to 1-1/8 inches wide, sessile or on short petioles up to 1/8-inch long; upper surface is green, somewhat glossy and covered in pubescent hairs, lower surface lighter green and hairier. Inflorescence: One to several umbels at stem tips and arising from leaf axils, 2 to 3 inches across and each with up to 25 orange-yellow to red flowers; flowers are ~ 3/8-inch across with 5 petals flaring out beneath the crown that has 5 cylindrical hoods open on the inside, each having a curved horn projecting from its center and arching over the shorter yellow central column in the center. Bloom Period: April to September. References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, Minnesota Wildflowers, SEINet, and Missouri Plants.	BONAP Distribution Map Map Color Key	Texas Status: Native

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Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County

© Tom Lebsack 2026

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