Psilostrophe sparsiflora
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| Psilostrophe sparsiflora | |
|---|---|
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| Botanical illustration by Mary Vaux Walcott, 1930s | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Psilostrophe |
| Species: | P. sparsiflora |
| Binomial name | |
| Psilostrophe sparsiflora | |
| Synonyms | |
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Psilostrophe sparsiflora, commonly known as greenstem paperflower, is a species of flowering plant in the family Asteraceae. It is native to Arizona, New Mexico, and Utah in the southwestern United States.
Description
Psilostrophe sparsiflora is a biennial or perennial forb or subshrub, typically 6 to 16 in (15 to 41 cm) tall. Its single or clustered stems are greenish and often hairy. The basal leaves are narrow to spatula-shaped and may have entire or irregularly lobed margins; leaves higher on the stem are smaller, alternate, and stalkless.
The yellow flower heads occur in loose clusters, usually in groups of three to six. Each head has both ray and disc florets, and the ray florets bend downward as the fruit develops. In Arizona, flowering has been recorded from May through November.
Taxonomy
Asa Gray first described the plant in 1884 as Riddellia tagetina var. sparsiflora. Aven Nelson raised it to species rank under its current name in 1903. Plants of the World Online recognizes Psilostrophe sparsiflora as an accepted species.
Distribution and habitat
The species occurs naturally in Arizona, New Mexico, and Utah. It grows on dry mesas and slopes, including grasslands, pinyon–juniper woodland, open pine forest, and other upland woodland. The University of Arizona records it from elevations of about 4,500 to 7,500 ft (1,400 to 2,300 m). In Utah it is found on the eastern side of the High Plateaus in Kane, Garfield, and Wayne counties, where it may be locally abundant and generally flowers from May to October.
References
- 1 2 3 4 "Psilostrophe sparsiflora (A.Gray) A.Nelson". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 3 November 2026.
- ↑ "Psilostrophe sparsiflora (A. Gray) A. Nelson". Integrated Taxonomic Information System. TSN 38315. Retrieved 3 November 2026.
- 1 2 3 "Psilostrophe sparsiflora – greenstem paperflower". Yavapai County Native and Naturalized Plants. University of Arizona Cooperative Extension. Retrieved 3 November 2026.
- ↑ "Taxon: Psilostrophe sparsiflora (A. Gray) A. Nelson". GRIN-Global. United States Department of Agriculture, Agricultural Research Service. Retrieved 3 November 2026.
- ↑ Desert Plants of Utah (PDF) (Report). Utah State University Extension. p. 73. Retrieved 3 November 2026.
External links
Media related to Psilostrophe sparsiflora at Wikimedia Commons
