Description
provided by eFloras
Biennials or perennials (rarely flowering first year), 10–40+ cm. Stems ± strigillose (greenish, sometimes ± villous in proximal axils). Heads in ± corymbiform arrays. Peduncles 8–12(–25+) mm. Involucres 4–6 mm. Ray florets (1–)2–3(–4); corolla laminae (6–)8–10+ mm, reflexed in fruit. Disc florets 7–9. Cypselae usually glabrous, sometimes gland-dotted; pap-pi of 4–5 lanceolate to lance-subulate scales 2–3 mm. 2n = 32.
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- cc-by-nc-sa-3.0
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Synonym
provided by eFloras
Riddellia tagetina Nuttall var. sparsiflora A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 318. 1884
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- cc-by-nc-sa-3.0
- copyright
- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Comprehensive Description
provided by North American Flora
Psilostrophe sparsiflora (A. Gray) A. Nelson, Proc. Biol. Soc Wash. 16: 23. 1903.
Riddellia tagetina sparsiflora A. Gray, Syn. Fl. N. Am. 1^: 318. 1886. Psilostrophe tagetina sparsiflora Greene, Pittonia 2: 176. 1891.
A perennial with thick taproot and woody caudex; stems usually several, 2-4 dm. high,
angled and striate, sparingly pUose and glandular-granuliferous, sparingly branched; branches
strongly ascending; basal leaves spatulate, 5-8 cm. long, loosely -illous; upper leaves linear or
linear-oblanceolate; heads comparatively few; involucre about 5 mm. high, 3 mm. broad,
villous; ligules usually 3, bright-yellow, 6-S mm. long, shallowly 3-lobed; disk-corollas about
10, glabrous; achenes angled, glabrous; squamellae unequal, lanceolate, scarcely half as long
as the disk-corollas.
Type locality: Southern Utah. Distribution: Southern Utah and Arizona.
- bibliographic citation
- Per Axel Rydberg. 1914. (CARDUALES); CARDUACEAE; HELENIEAE. North American flora. vol 34(1). New York Botanical Garden, New York, NY
