Biology:Opuntia fragilis

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Short description: Species of cactus

Opuntia fragilis
Opuntia fragilis 1.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Cactaceae
Genus: Opuntia
Species:
O. fragilis
Binomial name
Opuntia fragilis
(Nutt.) Haw.
Synonyms

Cactus fragilis
Opuntia brachyarthra

Opuntia fragilis, known by the common names brittle pricklypear and little prickly pear, is a prickly pear cactus native to much of western North America as well as some midwestern states such as Illinois, Iowa, Wisconsin and Michigan. It also occurs in several Canadian provinces. It is known from farther north than any other cactus,[2] occurring at as far as 56°N latitude in British Columbia.[3] There is an isolated and possibly genetically unique population in Eastern Ontario known as the "Kaladar population".[4]

Description

Opuntia fragilis is a small, prostrate plant, rarely more than 10 cm (4 in) high: joints tumid, fragile, easily detached, oval, elliptical, or subglobose, 3–5 cm (1–2 in) long and nearly as thick as broad, bright green: areoles 0.6–1.3 cm (1⁄4–1⁄2 in) apart, with whitish wool and a few white to yellow bristles, which are much longer and more abundant on older joints; spines 1–4, occasionally a few small additional ones, weak, dark brown, the upper one usually longer and stronger than the others, rarely 2.5 cm (1 in) in length: flowers greenish yellow, 2.5–3.2 cm (1–1 1⁄4 in) wide: fruit ovate to subglobose with few spines or bristles, mostly sterile, 2.5 cm (1 in) or less long; seeds few and large.[5]

Subspecies and varieties

  • Var. brachyarthra, Coult. A plant with more swollen joints, more numerous and stronger spines, smaller flowers and more spiny fruit Colorado, New Mexico.
  • Var. caespitosa, Hort. Joints bright green, smaller and more crowded than in the type: flowers bright yellow. Colorado.
  • var. fragilis [6][7]
  • Var. tuberiformis, Hort. Joints olive-green, bulbous-looking. Colorado.

Gallery

  • Opuntia fragilis "Feldberg" (9215688536).jpg
  • Roadside BrittlePickly-Pear Cactus (Opuntia fragillis) near Savona - (28639189495).jpg
  • Roadside BrittlePickly-Pear Cactus (Opuntia fragillis) near Savona - (28560479001).jpg

  • Opuntia fragilis var. denudata

  • Opuntia fragilis var. denudata

  • A hybrid

References

  1. ↑ Pinkava, D.J.; Puente, R.; Baker, M. (2017). "Opuntia fragilis". IUCN Red List of Threatened Species 2017: e.T151913A121572262. doi:10.2305/IUCN.UK.2017-3.RLTS.T151913A121572262.en. https://www.iucnredlist.org/species/151913/121572262. Retrieved 16 September 2021. 
  2. ↑ C.Michael Hogan. 2011. Cactus. Topic ed. Arthur Dawson. Ed.-in-chief Cutler J.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment. Washington DC
  3. ↑ Gorelick, R. 2015. Northern range limit of Opuntia fragilis and the Cactaceae is 56°N, not 58°N. Madroño 62(2):115-123.
  4. ↑ Mottiar, Y., P.D.J. Chafe and Eric Ribbens. 2015. Imperfect flowers of Opuntia fragilis in Kaladar, Ontario. Haseltonia 20:22-25.
  5. ↑ Haw.[clarification needed]
  6. ↑ "Opuntia fragilis". 2016-03-04. http://www.wildflower.org/plants/result.php?id_plant=opfr. 
  7. ↑ "Opuntia fragilis". http://www.fs.fed.us/database/feis/plants/cactus/opufra/all.html. 

External links

Wikidata ☰ Q138387 entry



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