Comprehensive Description
provided by North American Flora
Thymophylla greggii A. Gray, Mem. Am. Acad. II: 4: 92
1849.
Thymophylla Greggii radiata A. Gray, PI. Wright. 1: 119. 1852. Hymenatherum Greggii A. Gray, Proc. Am. Acad. 19: 42. 1883. Dyssodia Greggii B. L. Robinson, Proc. Am. Acad. 49: 507. 1913.
A perennial, with a cespitose suffrutescent base; stems 1-2 dm. high, densely white-tomentose, diffusely branched ; leaves opposite, crowded, tomentose, with smaller fasciculate ones in their axils, 1-1.5 cm. long, mostly 3-cleft into rather stiff, spinulose-tipped, filiform segments; peduncles 4-6 cm. long; involucre campanulate, 4 mm. high and about as broad, tomentose when young, often glabrate in age; bracts with deltoid or lanceolate tips, bearing 1-3 glands; ray-flowers usually present; ligules 3 mm. long, 1-1.5 mm. wide; disk-corollas 2.5 mm. long; tube half as long as the trumpet-shaped throat; achenes 2.5 mm. long, glabrous; pappus a crown of wholly united rather firm squamellae, sinuately dentate at the apex.
Type locality: Buena Vista, Coahuila.
Distribution: Western Texas, New Mexico, 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
