Texas Wildbuds
Trixis inula
(Tropical Threefold)
Trixis inula, Estero Llano Grande State Park, Weslaco, Hidalgo Co. 3071
Trixis inula, Estero Llano Grande State Park, Weslaco, Hidalgo Co. 3049
Trixis inula, Estero Llano Grande State Park, Weslaco, Hidalgo Co. 3037
Trixis inula, Estero Llano Grande State Park, Weslaco, Hidalgo Co. 3054
Trixis inula, Estero Llano Grande State Park, Weslaco, Hidalgo Co. 3058
Trixis inula, Estero Llano Grande State Park, Weslaco, Hidalgo Co. 5314
| Scientific Name | Trixis inula (Trixis radialis) | USDA PLANTS Symbol | TRIN6 |
| Common Name | Tropical Threefold, Mexican Threefold | ITIS Taxonomic Serial No. | 38581 |
| Family | Asteraceae (Sunflower) | SEINet Reference |
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| Description | Habitat: Clay, sandy or loamy soils in open areas, scrublands, thickets, and roadsides in far South Texas. Plant: Perennial, much-branched shrub, semiscandent (partially climbing or trailing, often supported by other structures or plants) with weak stems 3 to 6+ feet long. Leaves: Alternate, lanceolate or lanceolate-elliptic blades, 1 to 6-1/2 inches long on short petioles 1/8-inch long or less; margins entire or denticulate; smooth upper and lower surfaces but margins and sometimes underside midveins with hairs. Inflorescence: Corymbs or panicles of flower heads at stem tips; each head is about 3/4-inch across with no ray florets but 10 to 15 yellow disk florets; each corolla has two asymmetrical lips with one larger than the other, each lip with three small teeth at tips; each head has 8 linear phyllaries with acute tips; just below each head are 3 to 5 spreading linear to lanceolate or ovate bractlets. Bloom Period: March to November (following rains). References: "Wildflowers of Texas" by Michael Eason, Flora of North America and Trixis radialis in "Manual of the Vascular Plants of Texas" by Correll and Johnston. |
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 2025
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