bio.wikisort.org - Plant

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]

Opuntia fragilis
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
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

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

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  Opuntia fragilis var. denudata
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  Opuntia fragilis var. denudata
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  A hybrid

References

External links

• Jepson Manual Treatment
• Opuntia fragilis Photo gallery
• Opuntia fragilis photo gallery at Opuntia Web

На других языках

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- [en] Opuntia fragilis

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[es] Opuntia fragilis

Opuntia fragilis (Nutt.) Haw., es una especie fanerógama perteneciente a la familia Cactaceae. Es nativa de Norteamérica en Canadá y Estados Unidos.

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[ru] Опунция ломкая

Опунция ломкая или хрупкая, или нежная, или опадающая (лат. Opuntia fragilis) — кактус из рода опунция, произрастающий на большей части запада Северной Америки, а также в некоторых штатах Среднего Запада, таких как Иллинойс, Айова, Висконсин и Мичиган. Также встречается в нескольких провинциях Канады. Это самый северный вид кактусовых[2]: северная граница ареала данного вида доходит до 56° 17′ с. ш. и располагается вдоль реки Пис, в канадских провинциях Британская Колумбия и Альберта[3]. Данный вид может выживать при температурах до −50 °C при акклиматизации к холоду[4].

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