Description
(
anglais
)
fourni par 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.
- licence
- cc-by-nc-sa-3.0
- droit d’auteur
- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Synonym
(
anglais
)
fourni par eFloras
Riddellia tagetina Nuttall var. sparsiflora A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 318. 1884
- licence
- cc-by-nc-sa-3.0
- droit d’auteur
- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Comprehensive Description
(
anglais
)
fourni par 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.
- citation bibliographique
- Per Axel Rydberg. 1914. (CARDUALES); CARDUACEAE; HELENIEAE. North American flora. vol 34(1). New York Botanical Garden, New York, NY
