Comprehensive Description
provided by North American Flora
Boeberastrum concinnum (A. Gray) Rydberg
Hymenatherum concinnum A. Gray, Syn. Fl. N. Am. I 2 : 446. 1884. Dyssodia concinna B. L. Robinson, Proc Am. Acad. 49: 507. 1913.
A depressed annual; stem branched at the base; branches spreading, glabrous glaucescent; leaves alternate, fleshy, 1-2 cm. long, pinnately parted into linear obtuse divisions; heads subsessile and clustered at the summit of the leafy branches; involucre subhemispheric or shortcampanulate, about 6 mm. high and fully as broad; bracts 12-14, united fully half their length, with 2 rows of rounded glands; free portion ovate, scarious-margined; ray-flowers 10-12; ligules oblong, white, 4-5 mm. long; disk-corollas yellow, about 5 mm. long, glabrous; tube about equaling the trumpet-shaped throat; achenes clavate, 3.5 mm. long, angled, sparingly hairy on the angles; pappus 2.5 mm. long; squamellae 10, dissected into 5-7 bristles.
Type locality: [Near Tucson], Arizona. Distribution: Arizona.
- bibliographic citation
- Per Axel Rydberg. 1915. (CARDUALES); CARDUACEAE; HELENIEAE, TAGETEAE. North American flora. vol 34(2). New York Botanical Garden, New York, NY
