Comprehensive Description
provided by North American Flora
Hymenoxys helenioides (Rydb.) Cockerell, Bull. Torrey Club
31: 4S1. 1904.
Picradenia helenioides Rydb. Bull. Torrey Club 28: 21. 1901. Dugaldia helenioides A. Nelson; Coult. & Nels. Man. 562. 1909.
A tall biennial; stem branched above, about 5 dm. high, finely puberulent; leaves rather firm, finely puberulent, 5-15 cm. long, 5-10 mm. wide, linear or narrowly linear-oblanceolate, some of the middle ones often parted into 3-5 linear divisions; heads corymbose; involucre somewhat tomentose, hemispheric, 8-9 mm. high and about 15 mm. broad; outer bracts 14-18, narrowly lanceolate, united only at the base, longer than the inner; ligules orange, about 10 mm. long and 3 mm. wide; disk-corollas 4 mm. long, sparingly glandular; tube 1 mm. long; achenes 3 mm. long, silky-hirsute; squamellae 3 mm. long, lanceolate, attenuate into an awn-point.
Type locality: Sangre de Cristo Creek, southern Colorado. Distribution: Known only from the type locality.
- bibliographic citation
- Per Axel Rydberg. 1915. (CARDUALES); CARDUACEAE; HELENIEAE, TAGETEAE. North American flora. vol 34(2). New York Botanical Garden, New York, NY
