Comprehensive Description
provided by North American Flora
Thymophylla treculii (A. Gray) Small, Fl. SE. U. S. 1295. 1903
Hymenatherum Treculii A. Cray. Proc. Am Acad. 19: 42. Dyssodia Treculii B. I.. Robinson, Proc Am. Acad. 49: 508. 1913.
A glabrous perennial, scarcely fruticose at tinbase; stem diffusely branched, 1-2 dm. high; leaves opposite or alternate, 1-2 cm. long, pectinately pinnatifid into 5-13 linear, approximate, short segments; peduncles 3-5 cm. long; involucre hemispheric, 6 mm. high and 8 mm. broad, glabrous, with 5-8 lanceolate accessory bracts; principal bracts in a single series, wholly coalescent up to the triangular, short-acuminate free tips; glands mostly 1 or 2 on each bract; ligules 3 mm. long, 1.5 mm. wide; disk-corollas 3 mm. long; tube shorter than the trumpetshaped throat; lobes ovate; achenes 3 mm. long, sparingly hispidulous on the angles; squamellae 10, in two series, the inner 3 mm. long, with an awn between the two lobes of the apex, the outer oblong, 1 mm. long.
Type locality: Southeastern Texas. Distribution: Texas and Coahuila.
- bibliographic citation
- Per Axel Rydberg. 1915. (CARDUALES); CARDUACEAE; HELENIEAE, TAGETEAE. North American flora. vol 34(2). New York Botanical Garden, New York, NY
