Flora of North America species comparison

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Psilostrophe cooperi

Psilostrophe sparsiflora

Cooper's paper daisy, paper flower, whitestem paperflower

greenstem paperflower
Habit Shrubs or subshrubs, (15–)25–30(–50+) cm. Biennials or perennials (rarely flowering first year), 10–40+ cm.
Stems

pannose (white).

± strigillose (greenish, sometimes ± villous in proximal axils).
Peduncles

35–60(–80+) mm.

8–12(–25+) mm.
Involucres

6–8 mm.

4–6 mm.
Ray florets

(1–)2–3(–4);

corolla laminae (6–)8–10+ mm, reflexed in fruit.
Disc florets

(6–)10–17(–25).

7–9.
Heads

borne singly.

in ± 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 4–5 lanceolate to lance-subulate scales 2–3 mm.
Rays

3–6;

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

2n

= 32.

= 32.

Psilostrophe cooperi

Psilostrophe sparsiflora
Phenology Flowering (Feb–)Apr–Jun(–Dec). Flowering May–Sep.
Habitat Creosote-bush scrub, sandy washes Grasslands, pinyon-juniper scrub, sagebrush scrub, yellow pine forests
Elevation 100–2100 m (300–6900 ft) 900–2200 m (3000–7200 ft)
Distribution
from FNA
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; UT
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[BONAP county map]
Source FNA vol. 21, p. 454. FNA vol. 21, p. 454.
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. tagetina, P. villosa
Synonyms Riddellia cooperi Riddellia tagetina var. sparsiflora
Name authority (A. Gray) Greene: Pittonia 2: 176. (1891) (A. Gray) A. Nelson: Proc. Biol. Soc. Wash. 16: 23. (1903)
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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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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