Symphyotrichum defoliatum
Symphyotrichum defoliatum (formerly Aster bernardinus and Aster defoliatus) is a species of flowering plant in the family Asteraceae known by the common name San Bernardino aster.[4] It is endemic to Southern California where it grows in grasslands and meadows, and it is of conservation concern.
| Symphyotrichum defoliatum | |
|---|---|
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Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Tribe: | Astereae |
| Subtribe: | Symphyotrichinae |
| Genus: | Symphyotrichum |
| Subgenus: | Symphyotrichum subg. Ascendentes |
| Species: | S. defoliatum |
| Binomial name | |
| Symphyotrichum defoliatum | |
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| Endemic range in California outlined in red[3] | |
| Synonyms[2] | |
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Basionym
Alphabetical list
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Description
Symphyotrichum defoliatum is a perennial herbaceous plant growing from a long rhizome to a maximum height of 150 centimeters (5 feet). Leaves are widely lance-shaped to oblong and pointed, the largest ones near the base of the stem reaching up to 12 centimeters (4+3⁄4 inches) long. The stem and leaves are roughly hairy. The inflorescence is an array of flower heads with 15–40 pale violet ray florets around a center of golden disk florets. The fruit is a hairy cypsela with a long pappus.[5]
Chromosomes
Symphyotrichum defoliatum is an allopolyploid species likely derived from the backcrossing of S. falcatum (chromosome base number x = 5) with S. ascendens (base number x = 13), its hybrid derivative. The backcrossing produced this species with a unique base number of x = 18[6][7] and diploid individuals with 2n = 36.[5]
Distribution and habitat
San Bernardino aster is endemic to Southern California, where it is known only from the San Bernardino and San Gabriel Mountains of the Transverse Ranges, and from part of the Peninsular Ranges to the south. It grows in grassland and meadow habitats and in disturbed areas.[5]
Citations
References
- Allen, G.A. (2012). "Symphyotrichum defoliatum". In Jepson Flora Project (ed.). Jepson eFlora. The Jepson Herbarium, University of California, Berkeley. Retrieved 25 July 2021.
- Brouillet, L.; Semple, J.C.; Allen, G.A.; Chambers, K.L.; Sundberg, S.D. (2006). "Symphyotrichum defoliatum". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 20. New York and Oxford: Oxford University Press. Retrieved 15 July 2021 – via eFloras.
- NatureServe (2 July 2021). "Symphyotrichum defoliatum San Bernardino Aster". explorer.natureserve.org. Arlington, Virginia. Retrieved 15 July 2021.
- POWO (2021). "Symphyotrichum defoliatum (Parish) G.L.Nesom". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 22 July 2021.
- Semple, J.C. (n.d.). "Symphyotrichum subg. Ascendentes". www.uwaterloo.ca. Ontario. Archived from the original on 22 July 2021. Retrieved 22 July 2021.
- Semple, J.C. (14 May 2021). "Symphyotrichum ascendens — Long-leaved Aster, Intermountain Aster, Western Aster". www.uwaterloo.ca. Ontario. Archived from the original on 22 July 2021. Retrieved 22 July 2021.
- USDA, NRCS (2014). "Symphyotrichum defoliatum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 22 July 2021.
External links
- Symphyotrichum defoliatum in the CalPhotos photo database, University of California, Berkeley