Opuntia ×occidentalis

Engelmann

Proc. Amer. Acad. Arts 3: 291. 1856.

Synonyms: Opuntia engelmannii var. occidentalis (Engelmann) Engelmann
Treatment appears in FNA Volume 4. Treatment on page 141. Mentioned on page 129.

Shrubs, sprawling to erect, to 1.5 m. Stem segments not disarticulating, green, flattened, obovate, 19–35 × 14–18 cm, ± tuberculate, glabrous; areoles 5–7 (–8) per diagonal row across midstem segment, oblong, 5–8 × 4–6 mm; wool dark-brown. Spines 3–6 per areole, in most areoles (rarely few-spined), spreading, straight, angularly flattened, subulate; abaxial 2–4 spines reflexed, shorter, to 20 mm; adaxial 1–2 spines yellow or white chalky with brown basal portions, 25–50 mm. Glochids in moderately dense crescent at adaxial edge of areole and subapical tuft, reddish-brown, to 6 mm. Flowers: inner tepals yellow to deep pink, sometimes darker blush near base, to 50 mm; filaments usually yellow or white; anthers yellow; style pink or white; stigma lobes green. Fruits red-purple throughout, obovoid, 45–50 × 30–40 mm, juicy, glabrous, spineless; areoles 24–30. Seeds yellow-tan, 4–5.5 mm; girdle protruding to 1 mm. 2n = 66.


Phenology: Flowering spring (Apr–May).
Habitat: Coastal sage scrub, chaparral
Elevation: 10-500 m

Distribution

V4 268-distribution-map.gif

Calif. (including Channel Islands), Mexico (Baja California)

Discussion

Opuntia ×occidentalis is a hybrid complex involving three, perhaps more, species [at least O. littoralis × (O. engelmannii × O. phaeacantha)]. The hybrids are morphologically variable; the putative parents are all hexaploid. Another similar putative hybrid, O. demissa, probably involves O. oricola (B. D. Parfitt and M. A. Baker 1993).

Selected References

None.

Lower Taxa

None.

... more about "Opuntia ×occidentalis"
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 />) +
deciduous +  and persistent +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
24 +  and 30 +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Donald J. Pinkava +
Engelmann +
proliferating +
flattened +  and cylindric +
Calif. (including Channel Islands) +  and Mexico (Baja California) +
10-500 m +
white +  and yellow +
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 +
45mm;50mm +
proliferating +
tuberculate +  and smooth +
obovoid +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 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 /> (0.6 cm6 mm <br />0.006 m <br />) +
foveolate +  and reticulate +
Coastal sage scrub, chaparral +
oblong +  and spatulate +
0 cm0 mm <br />0 m <br /> (5 cm50 mm <br />0.05 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 +
Proc. Amer. Acad. Arts +
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 />) +
warped;generally circular;reniform flattened +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
not sheathed +
7.5 cm75 mm <br />0.075 m <br /> (17 cm170 mm <br />0.17 m <br />) +
white chalky +  and yellow +
straight +
deciduous +  and persistent +
reflexed +  and spreading +
conspicuous +
with hairlike bristles +  and setose +
3 (?) +  and 6 (?) +
subulate +  and flattened +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
hard +  and rigid +
decurrent +
winged +  and unsegmented +
tuberculate +  and smooth +
not disarticulating +
60 cm600 mm <br />0.6 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
19 cm190 mm <br />0.19 m <br /> (35 cm350 mm <br />0.35 m <br />) +
14 cm140 mm <br />0.14 m <br /> (18 cm180 mm <br />0.18 m <br />) +
segmented +
woody +  and succulent +
white +  and pink +
Opuntia engelmannii var. occidentalis +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Opuntia ×occidentalis +
species +
dull +  and glossy +
yellow +  and paler +
segmented +
terrestrial;epiphytic or epipetric +
sprawling +  and erect +
dark-brown +