Biology:Helianthus nuttallii subsp. parishii

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Short description: Subspecies of sunflower

Helianthus nuttallii subsp. parishii
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Helianthus
Species:
H. nuttallii
Subspecies:
H. n. subsp. parishii
Trinomial name
Helianthus nuttallii subsp. parishii
(A.Gray) Heiser

Helianthus nuttallii subsp. parishii is a subspecies of the species Helianthus nuttallii in the genus Helianthus, family Asteraceae.[1][2] It is also known by the common names Los Angeles sunflower[1] and Parish's sunflower.[3] This subspecies has not been seen, in the wild or in cultivation, since 1937.[1]

Description

  • Stems: Range from glabrous (smooth) to tomentose (furry).[1]
  • Leaves: Leaf arrangement is alternate. Upper leaf surfaces are hairy and rough or tomentose, while the lower leaf surfaces are more or less finely tomentose.[1]
  • Inflorescences: Variable number of flowers are borne in round or flat-topped clusters. Peduncles (flower stalks) and phyllaries (involucral bracts) are densely hairy. Flowers from August–October.[1]
    • Ray Florets: Typically 12-21 ray florets per capitulum. Individual ray florets measure between 15-25mm in length.[1]
    • Disc Florets: Corollas measure 5-7mm, with yellow lobes.[1]
  • Fruits: Fruits measure 3-4mm in length, with a pappus scales 3-4mm, sometimes less.[1]

Habitat and distribution

Inhabits marshy areas less than 500m above sea level in central western and southwestern California .[1]

Etymology

Helianthus is derived from Greek, meaning 'sun-flower' ('heli' meaning 'sun', and 'anthus', as in 'anther', meaning 'flower'). As the large, yellow-gold heads of many species tend to follow the sun, the Italian-derived 'girare-sole', literally meaning 'turning sun', is also a cognate with 'Jerusalem', as in Jerusalem Artichoke.[4]

Nuttallii is named for Thomas Nuttall (1786-1859), a grower of American plants at Rainhill in Lancashire, though he lived in Long Preston in Yorkshire.[4]

Parishii is named for Samuel Bonsall Parish and William Fletcher Parish, California botanists.[5]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Baldwin, B. G., D. H. Goldman, D. J. Keil, R. Patterson, T. J. Rosatti, and D. H. Wilken, editors. 2012. "The Jepson Manual: vascular plants of California", second edition. University of California press, Berkeley. ISBN:9780520253124. pp 344
  2. ↑ "Helianthus nuttallii subsp. Parishii (A.Gray) Heiser — the Plant List". http://www.theplantlist.org/tpl1.1/record/gcc-64983. 
  3. ↑ "Helianthus nuttallii subsp. parishii". Natural Resources Conservation Service PLANTS Database. USDA. https://plants.usda.gov/core/profile?symbol=HENUP. Retrieved 14 January 2017. 
  4. ↑ 4.0 4.1 Gledhill, David (2008). "The Names of Plants". Cambridge University Press. ISBN:9780521866453 (hardback), ISBN:9780521685535 (paperback). pp 194, 275, 291
  5. ↑ A. Gray. Contributions to North American Botany. (1883) Proceedings of the American Academy of Arts and Sciences. volume 19. [1]

Wikidata ☰ Q24688235 entry



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