Hymenoxys davidsonii

Comprehensive Description

provided by North American Flora
Hymenoxys davidsonii (Greene) Coekerell, Bull. Torrey Club
31: 508. 1904.
Picradenia Davidsonii Greene, Pittonia 4: 240. 1901.
A branched biennial or perennial; stems 2-3 dm. high, striate, sparingly striate, pilose; leaves 3-4 cm. long, pinnatind into linear divisions, nearly glabrous; heads many, corymbosecymose; peduncles 4-8 cm. long; involucre nearly hemispheric, 5-6 mm. high, 8 mm. broad, puberulent; outer bracts about 10, united one fourth their length, ovate4anceolate, the herbaceous margin narrow; inner bracts similar but longer and broader; ligules 5-6 mm. long, 2.5-2.8 mm. wide; disk-corollas 4 mm. long, sparingly glandular; tube 1 mm. long; achenes 2 mm. long, hirsute; squamellae lance-ovate, acute or acuminate, 1 mm. long.
Type locality: Clifton, 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
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