Comprehensive Description
provided by North American Flora
Hymenopappus robustus Greene, Bull. Torrey Club 9: 63. 1882
Hymenopappus flavescens A. Gray, PI. Wright. 2: 94. 1853. Not H. flavescens A. Gray. 1849.
A leafy-stemmed biennial; stem 3-8 dm. high, striate, white-tomentose, corymbosely
branched; leaves bipinnatifid into narrowly linear divisions, or the earliest ones rarely pinnatifid
with lanceolate divisions, loosely floccose above, white-tomentose beneath; heads corymbose;
involucre 6 mm. high, about 8 mm. broad; bracts obovate, tomentose with yellow tips; corollas
yellow; tube about 2 mm. long; lobes lance-oblong, about equaling the campanulate throat,
1.5 mm. long; anthers wholly and filaments partly exserted; achenes 4 mm. long, striate,
longvillous on the angles; squamellae oblong, fully half as long as the corolla-tube.
Type locality: New Mexico.
Distribution: Texas to Arizona, Coahuila, and Chihuahua.
- bibliographic citation
- Per Axel Rydberg. 1914. (CARDUALES); CARDUACEAE; HELENIEAE. North American flora. vol 34(1). New York Botanical Garden, New York, NY
