Tonestus peirsonii is a local-endemic species of flowering plant in the family Asteraceae known by the common names Inyo tonestus,[2] Peirson's serpentweed[3] and Peirson's tonestus.
| Toiyabea peirsonii | |
|---|---|
| |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Toiyabea |
| Species: | T. peirsonii
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| Binomial name | |
| Toiyabea peirsonii | |
| Synonyms[1] | |
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Distribution
editThe plant is endemic to California, where it is known only from the Eastern High Sierra Nevada, and the White Mountains across Owens Valley to the east, both within Inyo National Forest. It grows in mountain habitat in subalpine and alpine climates at 2900–3700 m, preferring rock talus or niches in granite cliffs.[4] These images are from the original type location high in Rock Creek basin, Inyo County CA.[5]
Description
editToiyabea peirsonii is a perennial herb producing a branching stem from a caudex and taproot unit, reaching up to about 20 centimeters tall and taking a clumpy form. The leaves are up to 8 centimeters long, variable in shape but usually broader toward the end, and with toothed edges.[2] Dried remnants of leaves or flowers from previous years may be visible.
The inflorescence is usually a single flower head, or a cluster of up to four heads, each up to 2 centimeters wide with green, rough-haired phyllaries in a broad (14-28mm) somewhat leaf-like involucre below the flower. The head bears 16-20 curling, bright yellow ray florets around a center containing many tubular disc florets. Blooming occurs in July and August.[4]
References
edit- ^ "Toiyabea peirsonii (D.D.Keck) G.L.Nesom". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 21 March 2024.
- ^ a b Norman F. Weeden (1996). A Sierra Nevada Flora. Wilderness Press, Berkeley. ISBN 0899972047.
- ^ NRCS. "Tonestus peirsonii". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 11 December 2015.
- ^ a b Bruce G. Baldwin; et al. (2012). The Jepson Manual, Vascular Plants of California (2nd ed.). University of California Press. ISBN 9780520253124.
- ^ Cathy Rose & Stephen Ingram (2015). Rock Creek Wildflowers. California Native Plant Society Press. ISBN 9780943460543.
External links
edit- Jepson Manual Treatment of Tonestus peirsonii
- Tonestus peirsonii Photo gallery
- Flora of North America
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