FNA: Psilostrophe villosa vs. Psilostrophe sparsiflora

	Psilostrophe villosa	Psilostrophe sparsiflora
	woolly paperflower	greenstem paperflower
Habit	Biennials or perennials (rarely flowering first year), 10–45(–60+) cm.	Biennials or perennials (rarely flowering first year), 10–40+ cm.
Stems	arachno-villous (gray to gray-green).	± strigillose (greenish, sometimes ± villous in proximal axils).
Peduncles	(0.5–)1–3(–5+) mm.	8–12(–25+) mm.
Involucres	4–5(–7) mm.	4–6 mm.
Ray florets		(1–)2–3(–4); corolla laminae (6–)8–10+ mm, reflexed in fruit.
Disc florets	5–8(–12).	7–9.
Heads	in ± crowded, corymbiform arrays.	in ± corymbiform arrays.
Cypselae	usually glabrous, sometimes gland-dotted; pappi of 4–6 lanceolate to lance-subulate scales 2.5–3+ mm.	usually glabrous, sometimes gland-dotted; pappi of 4–5 lanceolate to lance-subulate scales 2–3 mm.
Rays	(2–)3(–5); laminae 3–4(–6) mm, spreading in fruit.
2n	= 32.	= 32.

	Psilostrophe villosa	Psilostrophe sparsiflora
Phenology	Flowering (Mar–)May–Aug(–Oct).	Flowering May–Sep.
Habitat	Grasslands, limestone soils, gypseous soils, caliche	Grasslands, pinyon-juniper scrub, sagebrush scrub, yellow pine forests
Elevation	300–900 m (1000–3000 ft)	900–2200 m (3000–7200 ft)
Distribution	KS; NM; OK; TX [WildflowerSearch map] [BONAP county map]	AZ; NM; UT [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. 455.	FNA vol. 21, p. 454.
Parent taxa	Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Psilostrophe	Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Psilostrophe
Sibling taxa	P. bakeri, P. cooperi, P. gnaphalodes, P. sparsiflora, P. tagetina	P. bakeri, P. cooperi, P. gnaphalodes, P. tagetina, P. villosa
Synonyms	P. tagetina var. cerifera	Riddellia tagetina var. sparsiflora
Name authority	Rydberg ex Britton: Man. Fl. N. States, 1006. (1901)	(A. Gray) A. Nelson: Proc. Biol. Soc. Wash. 16: 23. (1903)
Web links	Local Web sites: KS Wildflowers WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local Web sites: SW CO Wildflowers WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Psilostrophe sparsiflora

woolly paperflower

greenstem paperflower

Habit

Biennials or perennials (rarely flowering first year), 10–45(–60+) cm.

Biennials or perennials (rarely flowering first year), 10–40+ cm.

Stems

arachno-villous (gray to gray-green).

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

Peduncles

(0.5–)1–3(–5+) mm.

8–12(–25+) mm.

Involucres

4–5(–7) mm.

4–6 mm.

Ray florets

(1–)2–3(–4);

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

Disc florets

5–8(–12).

7–9.

Heads

in ± crowded, corymbiform arrays.

in ± corymbiform arrays.

Cypselae

usually glabrous, sometimes gland-dotted;

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

usually glabrous, sometimes gland-dotted;

pappi of 4–5 lanceolate to lance-subulate scales 2–3 mm.

Rays

(2–)3(–5);

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

= 32.

Psilostrophe sparsiflora

Phenology

Flowering (Mar–)May–Aug(–Oct).

Flowering May–Sep.

Habitat

Grasslands, limestone soils, gypseous soils, caliche

Grasslands, pinyon-juniper scrub, sagebrush scrub, yellow pine forests

Elevation

300–900 m (1000–3000 ft)

900–2200 m (3000–7200 ft)

Distribution

KS; NM; OK; TX

[WildflowerSearch map]

[BONAP county map]

AZ; NM; UT

[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. 455.

FNA vol. 21, p. 454.

Parent taxa

Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Psilostrophe

Sibling taxa

P. bakeri, P. cooperi, P. gnaphalodes, P. sparsiflora, P. tagetina

P. bakeri, P. cooperi, P. gnaphalodes, P. tagetina, P. villosa

Synonyms

P. tagetina var. cerifera

Riddellia tagetina var. sparsiflora

Name authority

Rydberg ex Britton: Man. Fl. N. States, 1006. (1901)

(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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Flora of North America species comparison

Psilostrophe villosa

Psilostrophe sparsiflora

Psilostrophe villosa

Psilostrophe sparsiflora