Opuntia microdasys

(Lehmann) Pfeiffer

Enum. Diagn. Cact., 154. 1837.

Common names: Bunny-ears pricklypear
Introduced
Basionym: Cactus microdasys Lehmann Index Seminum (Hamburg), 1827: 16. 1827
Treatment appears in FNA Volume 4. Treatment on page 141. Mentioned on page 125, 142.

Shrubs, erect to sprawling, to 1 m, with many small stem segments. Stem segments not disarticulating, bright green, flattened, circular to elliptic-obovate, (5–) 7–10 (–15) × (3–) 4–8 (–10) cm, low tuberculate, puberulent; areoles (9–) 11–16 per diagonal row across midstem segment, subcircular, 2–5 mm diam.; wool white to tan, aging gray. Spines absent. Glochids numerous, nearly filling areole, usually yellow or whitish, sometimes reddish-brown, to 3 mm. Flowers: inner tepals bright-yellow throughout, aging peach, 25–30 mm; filaments and style white; anthers yellowish; stigma lobes dark green. Fruits red, spheric to ovoid, 20–25 × 12–16 mm, fleshy, pubescent, spineless; areoles 35–50. Seeds tan, nearly spheric (slightly flattened), 1–1.2 mm (perhaps infertile); girdle protruding to 0.5 mm. 2n = 22.


Phenology: Flowering spring (Apr–May).
Habitat: Desert hills, uplands, sandy to loamy calcareous soils
Elevation: 1700-2100 m

Distribution

V4 269-distribution-map.gif

Introduced; Ariz., Mexico (Coahuila), Mexico (Durango), Mexico (Nuevo León), Mexico (San Luis Potosí), Mexico (Zacatecas)

Discussion

Opuntia microdasys is widely cultivated and sometimes naturalized in Arizona. In Mexico, O. microdasys hybridizes with O. rufida.

Selected References

None.

Lower Taxa

None.
... more about "Opuntia microdasys"
cushionlike +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
deciduous +  and persistent +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
35 +  and 50 +
subcircular +
0.1 cm1 mm <br />0.001 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Donald J. Pinkava +
(Lehmann) Pfeiffer +
Cactus microdasys +
proliferating +
flattened +  and cylindric +
Bunny-ears pricklypear +
Ariz. +, Mexico (Coahuila) +, Mexico (Durango) +, Mexico (Nuevo León) +, Mexico (San Luis Potosí) +  and Mexico (Zacatecas) +
1700-2100 m +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (15 cm150 mm <br />0.15 m <br />) +
burlike +  and spiny +
straight +
indehiscent +
persistent +, long +  and deciduous +
20mm;25mm +
proliferating +
tuberculate +  and smooth +
spheric +  and ovoid +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
foveolate +  and reticulate +
Desert hills, uplands, sandy to loamy calcareous soils +
oblong +  and spatulate +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
deciduous +
flattened +  and conic +
0 cm0 mm <br />0 m <br /> (3 cm30 mm <br />0.03 m <br />) +
succulent +
tuberculate +
fluted;spheric;depressed-spheric or club-shaped +
tinged color +
open +  and simple +
sometimes covered by outgrowths of proximal portion of style base or of flower tube wall +  and open +
persistent +  and deciduous +
Flowering spring (Apr–May). +
ridgelike +  and nipple--shaped +
Enum. Diagn. Cact., +
3;2;2;30 +
tuberlike +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
spheric +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Introduced +
not sheathed +
7.5 cm75 mm <br />0.075 m <br /> (17 cm170 mm <br />0.17 m <br />) +
dark-brown +  and black +
deciduous +  and persistent +
conspicuous +
with hairlike bristles +  and setose +
0 (?) +  and 15 (?) +
terete +  and angular-flattened +
0 cm0 mm <br />0 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
hard +  and rigid +
decurrent +
winged +  and unsegmented +
tuberculate +  and smooth +
not disarticulating +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
segmented +
woody +  and succulent +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Opuntia microdasys +
species +
dull +  and glossy +
yellow +  and paler +
segmented +
terrestrial;epiphytic or epipetric +
erect +  and sprawling +
gray +, white +  and tan +