Comprehensive Description
provided by North American Flora
Thymophylla wrightii (A. Gray) Small, Fl. SE. U. S. 1295
1903.
Hymenatherum Wrightii A. Gray, Mem. Am. Acad. II. 4: 89. 1849. Dyssodia Wrightii B. L. Robinson, Proc. Am. Acad. 49: 508. 1913.
A glabrous perennial herb; stems 2-4 cm. high, several from the persistent base, branched above; leaves opposite or alternate, 2-5 cm. long, linear and entire or divided below into linear divisions, spinulose-tipped ; peduncles 5-8 cm. long; involucre hemispheric, 6-7 mm. high, 8-12 mm. broad, with a calyculum of 1-5 lance-subulate small accessory bracts; principal bracts 18-22, in two series, united to the ovate tips, the glands usually 2, conspicuous; ligules 4 mm. long, 2 mm. wide, yellow; disk-corollas 3 mm. long; tube shorter than the trumpet-shaped throat; lobes ovate; achenes 3.5 mm. long, strigose, slightly hirsutulous; squamellae 10, all awned, some of them 3-awned.
Type locality: Between Rio Colorado and Rio Guadalupe, Texas. Distribution: Texas.
- bibliographic citation
- Per Axel Rydberg. 1915. (CARDUALES); CARDUACEAE; HELENIEAE, TAGETEAE. North American flora. vol 34(2). New York Botanical Garden, New York, NY
