Flora of North America species comparison

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Psilostrophe cooperi

Psilostrophe villosa

Cooper's paper daisy, paper flower, whitestem paperflower

woolly paperflower
Habit Shrubs or subshrubs, (15–)25–30(–50+) cm. Biennials or perennials (rarely flowering first year), 10–45(–60+) cm.
Stems

pannose (white).

arachno-villous (gray to gray-green).
Peduncles

35–60(–80+) mm.

(0.5–)1–3(–5+) mm.
Involucres

6–8 mm.

4–5(–7) mm.
Disc florets

(6–)10–17(–25).

5–8(–12).
Heads

borne singly.

in ± crowded, corymbiform arrays.
Cypselae

usually glabrous, sometimes gland-dotted;

pappi of 4–6 oblong to ± lanceolate scales 2–2.5 mm.

usually glabrous, sometimes gland-dotted;

pappi of 4–6 lanceolate to lance-subulate scales 2.5–3+ mm.
Rays

3–6;

laminae (8–)12–20 mm, spreading to reflexed in fruit.

(2–)3(–5);

laminae 3–4(–6) mm, spreading in fruit.
2n

= 32.

= 32.

Psilostrophe cooperi

Psilostrophe villosa
Phenology Flowering (Feb–)Apr–Jun(–Dec). Flowering (Mar–)May–Aug(–Oct).
Habitat Creosote-bush scrub, sandy washes Grasslands, limestone soils, gypseous soils, caliche
Elevation 100–2100 m (300–6900 ft) 300–900 m (1000–3000 ft)
Distribution
from FNA
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
KS; NM; OK; TX
[WildflowerSearch map]
[BONAP county map]
Discussion

In trans-Pecos Texas, Psilostrophe villosa has been collected within 10 km or so of the Rio Grande; it probably occurs in Mexico. Within 100 km or so of the New Mexico-Texas border, P. villosa and P. tagetina intergrade; B. L. Turner et al. (1988) treated P. villosa as P. tagetina var. cerifera.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 454. FNA vol. 21, p. 455.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Psilostrophe Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Psilostrophe
Sibling taxa
P. bakeri, P. gnaphalodes, P. sparsiflora, P. tagetina, P. villosa
P. bakeri, P. cooperi, P. gnaphalodes, P. sparsiflora, P. tagetina
Synonyms Riddellia cooperi P. tagetina var. cerifera
Name authority (A. Gray) Greene: Pittonia 2: 176. (1891) Rydberg ex Britton: Man. Fl. N. States, 1006. (1901)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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