Opuntia fragilis (Nutt.) Haw.

Fragile cactus (en)

Species

Angiosperms > Caryophyllales > Cactaceae > Opuntia

Characteristics

Shrubs, low, forming mats, 2-10 cm. Stem segments easily detached when terminal, dark green, subspheric to subcylindric, to flattened and elliptic obovate, (1.5-)2-5.5 × (1-)1.5-3 cm, low tuberculate (pronounced when dried), glabrous; areoles 3-5 per diagonal row across midstem segment, oval, 3 × 2.5 mm; wool white. Spines 3-8 per areole, in most areoles spreading, gray with brown tips, straight, ± acicular, terete, the longest 8-24 mm; depressed spines at base of areoles 0-3, 1-3 mm. Glochids in crescent at adaxial margin of areole, tan to brown, inconspicuous, to 3 mm. Flowers: inner tepals yellow, sometimes basally red, 20-26 mm; filaments white or red; anthers yellow; style white; stigma lobes green. Fruits tan, 10-30 × 8-15 mm, dry, glabrous; areoles 12-22, distal areoles bearing 1-6 short spines. Seeds tan to gray, flattened, warped, oblong to subcircular, 5-6 mm diam.; girdle protruding 1-1.5 mm. 2n = 66.
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Prostrate or spreading, forming dense mats to 5 dm wide; joints orbicular to obovate, very turgid, 2–5 × 1–2.5 cm, easily detached; areoles crowded, commonly 3–6 mm apart, usually coarsely white-woolly, all or nearly all armed with (1–)3–7 strongly barbed spines 1.2–2.5 cm; fls yellow to greenish, 4–5 cm wide; fr fleshy and greenish to reddish when young, dry and tan at maturity, inedible, 1.2–1.5 cm; seeds discoid, with an irregular margin; 2n=66. Dry prairies and plains; Ill. and Wis. and n. Mich. to B.C., n. Tex., and Ariz. May–July.
A cactus. It is low and shrubby. It forms clumps 5-10 cm high and 30 cm across. The stem segments are short and vary in shape. They are studded with clusters of up to 9 spines. The flowers are greenish-yellow. The fruit are green and egg shaped. They become red as they ripen.
Life form perennial
Growth form shrub
Growth support free-standing
Foliage retention evergreen
Sexuality hermaphrodite
Pollination entomogamy
Spread -
Mature width (meter) 0.3
Mature height (meter) 0.1
Root system -
Rooting depth (meter) 0.4
Root diameter (meter) -
Flower color
Blooming months -
Fruit color
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Dry prairies, sandhills and rocks. Woodlands of ponderosa pine, juniper, and pinyon, temperate grasslands, sage scrub and also growing in barren rocky areas; at elevations from sea level to 2,400metres.
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It is a temperate plant. It extends to 56°N into British Columbia in Canada. It grows in dry areas. In California it can grow to 2,000 m altitude or higher. It suits hardiness zones 6-10.
Light 7-9
Soil humidity 1-3
Soil texture 3-6
Soil acidity 3-7
Soil nutriment -
Hardiness (USDA) 6-9

Usage

The spines are scorched off in a hot fire and the stem segments are then roasted. The inner part is then eaten.
Uses environmental use gum medicinal oil
Edible fruits leaves seeds stems
Therapeutic use Dermatological Aid (unspecified), Diuretic (unspecified), Throat Aid (unspecified)
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by cuttings or seedlings.
Mode cuttings seedlings
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Habit

Opuntia fragilis habit picture by Lowe Rudd (cc-by-sa)

Leaf

Opuntia fragilis leaf picture by Vanessa Tietzmann (cc-by-sa)
Opuntia fragilis leaf picture by Jennifer MacDonald (cc-by-sa)
Opuntia fragilis leaf picture by Kyler Bowers (cc-by-sa)

Distribution

Opuntia fragilis world distribution map, present in Canada and United States of America

Conservation status

Opuntia fragilis threat status: Least Concern

Identifiers

LSID -
WFO ID wfo-0000385744
COL ID 6SRLS
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Opuntia fragilis Opuntia sabinii Tunas fragilis Cactus fragilis Terecaulis fragilis Opuntia fragilis f. brachyarthra Opuntia brachyarthra Opuntia fragilis var. brachyarthra Opuntia fragilis subsp. brachyarthra Opuntia fragilis var. caespitosa Opuntia fragilis var. denudata Opuntia fragilis var. parviconspicua Opuntia fragilis var. tuberiformis