Woolly Paperflower

See comments under 6. Psilostrophe villosa.

Biennials or perennials (rarely flowering first year), 10–30(–60+) cm. Stems arachno-villous (gray to gray-green). Heads in ± loose to crowded, corymbiform arrays. Peduncles (3–)12–20(–40) mm. Involucres 4–8 mm. Rays 3–4(–6); laminae (3–)7–14+ mm, spreading in fruit. Disc florets 6–9(–12). Cypselae usually glabrous, sometimes hirtellous and/or gland-dotted; pappi of (4–)6–8 elliptic or lanceolate to lance-subulate scales 2–3+ mm. 2n = 32.

Riddellia tagetina Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 371. 1841 (as tagetinae); Psilostrophe tagetina var. grandiflora (Rydberg) Heiser; P. tagetina var. lanata A. Nelson

Psilostrophe grandiflora Rydberg, sp. nov
A green perennial, woody at the base; stems sparingly villous with ascending branches; leaves entire, spatulate or the upper linear-oblanceolate, the lower 3-6 cm. long, green, sparingly villous; heads corymbose, rather numerous; peduncles slender, 2-4 cm. long; involucre about 6 mm. long, 3-4 mm. broad; ligules mostly 3, bright-yellow, 8-10 mm. long, rather shallowly 3or 4-toothed; disk-corollas 7-10, glabrous; achenes 5-angled, glabrous, striate; squamellae ovateor lance-oblong, obtuse, less than half as long as the disk-corollas.
Type collected near Cedar Gulch, Paradise, Arizona, Blumer 1709 (herb. N. Y. Bot. Gard.). Distribution: Arizona, New Mexico, and Sonora (?).

Psilostrophe tagetina is a flowering plant in the daisy family known by the common name woolly paperflower. It is native to Arizona, Colorado, Kansas, New Mexico, Oklahoma, Texas, Utah, and northwestern Mexico.