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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Astereae
Subtribus: Pentachaetinae
Genus: Pentachaeta
Species: P. alsinoides – P. aurea – P. bellidiflora – P. exilis – P. fragilis – P. lyonii – P. physopus
Name

Pentachaeta Nutt., Trans. Amer. Philos. Soc. ser. 2, 7: 336. (1840)

Type species: Pentachaeta aurea Nutt., Trans. Amer. Philos. Soc. ser. 2, 7: 336. (1840)

References

Nuttall, T. 1840. Descriptions of new species and genera of plants in the natural order of the Compositae, collected in a tour across the continent to the Pacific, a residence in Oregon, and a visit to the Sandwich Islands and upper California, during the years 1834 and 1835. Transactions of the American Philosophical Society, held at Philadelphia, for promoting useful knowledge, n.s.[new series][ser. 2], 7: 283–453. BHL Reference page.
Hassler, M. 2017. Pentachaeta. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2017. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2017 Dec 18. Reference page.
International Plant Names Index. 2017. Pentachaeta. Published online. Accessed: Dec. 18 2017.
Tropicos.org 2017. Pentachaeta. Missouri Botanical Garden. Published on the internet. Accessed: 2017 Dec. 18}.

Vernacular names
English: Pygmy Daisy

Pentachaeta is a genus of the family Asteraceae; the entire genus is endemic to California. Of the six species members, at least one, Pentachaeta bellidiflora, is classified as an endangered species. The etymology of the genus name derives from Greek: Penta = five + chaeta = bristle, referring to the pappus scales of P. aurea. It was combined in Chaetopappa, but later work led to the genus being recognized as definitely separate. It is most closely related to Rigiopappus and Tracyina.[1] Pygmydaisy is a common name for Pentachaeta.[2]

Description

This genus consists of annual plants whose above surface architecture emanates from slender taproot, which appears smooth, but actually is covered by fine hairs. The stems are typically simple or branching in the lower half of plant, and they are erect, generally flexible, and of green to reddish color. Pentachaeta leaves are normally narrowly linear, ciliate and green. The terminal inflorescences are solitary with heads radiate, disciform or discoid; peduncles manifest as wispy with bell-shaped involucres measuring three to seven millimeters. This genus has green phyllaries in two to three generally equal series, lanceolate to obovate, with margins widely scarious, and a naked receptacle. The white, yellow or red corolla may be simplified to a tube. The disk shaped flowers manifest linear, acute style tips. Fruits are 1.5 to 3.0 millimeters in diameter and are generally compressed in an oblong-fusiform shape and are typically covered with small hairs. Each species presents fragile pappuses with slender bristles.[3]
See also

List of Asteraceae genera
Crystal Springs Reservoir
Rare species

References

Pentachaeta in Flora of North America @ efloras.org
"Pentachaeta". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 22 September 2015.
Van Horn 1973 Univ Calif Publ Bot 65:1–41

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