Cylindropuntia bigelovii var. bigelovii

Treatment appears in FNA Volume 4. Treatment on page 109. Mentioned on page 110.

Trees, densely branched, with older branches at base of crown dark-brown, clinging to usually solitary trunk, 0.3–1.5 (–3) m. Stem segments whorled or subwhorled, green to gray-green, 4–13 (–18) × (2–) 4–5.5 cm, distal ones usually very easily detached (propagules); tubercles salient, broadly oval, 0.4–0.8 cm; areoles elliptic-deltate, 5–6 ×3–4 mm; wool white-yellow to brownish, aging gray. Spines (8–) 10–15 per areole, at most areoles, interlaced with spines of adjacent areoles, usually uniformly, diffusely spreading and nearly completely obscuring stem, pale-yellow to yellow to tan, aging brown; abaxial spines spreading to deflexed, subterete to flattened, the longest (10–) 15–25 mm; adaxial spines erect or spreading, terete, the longest (10–) 20–28 mm; sheaths uniformly whitish or pale-yellow, not obviously baggy. Glochids in broad adaxial crescent, sometimes extending along areole margins, yellow, 3–4 mm. Flowers: inner tepals pale green to whitish, sometimes tipped red, spatulate, (15–) 20–25 mm, emarginate-apiculate, often erose; filaments green; anthers orange; style light green; stigma lobes light to dark green. Fruits usually sterile, not proliferating, yellow at maturity, cylindric to broadly obconic, (15–) 22–40 × (8–) 16–20 (–28) mm, fleshy-leathery, strongly tuberculate, becoming spineless, losing bristlelike spines of young fruit; umbilicus 8–10 mm deep; areoles 36–64, evenly spaced. Seeds, when present, pale-yellow, in gelatinous mass, angular to squarish in outline, 2.5–4 × 2.2–3.5 mm, warped, sides with 1–2 large depressions; girdle smooth or as very narrow marginal ridge. 2n = 22 or, usually, 33.


Phenology: Flowering spring–fall (Mar–Jun, Sep).
Habitat: Mojave and Sonoran deserts, sandy flats, gravelly to rocky washes, bajadas, hillsides
Elevation: 300-900 m

Distribution

V4 207-distribution-map.gif

Ariz., Calif., Nev., Mexico (Baja California Sur), Mexico (Sonora)

Discussion

Cylindropuntia bigelovii forms two hybrids. Cylindropuntia ×fosbergii (C. B. Wolf) Rebman, M. A. Baker & Pinkava (= C. bigelovii × C. echinocarpa), which L. D. Benson (1982) treated as Opuntia bigelovii var. hoffmannii Fosberg, occurs southwest of the Salton Sea, California, forms shrubby trees 1–2 m with yellow-green inner tepals and green filaments, and has a chromosome number of 2n = 33. Cylindropuntia ×campii (M. A. Baker & Pinkava) M. A. Baker & Pinkava (= C. bigelovii × C. acanthocarpa) forms more open trees than O. bigelovii, has yellow-green inner tepals and filaments, and has a chromosome number of 2n = 44.

Selected References

None.

Lower Taxa

None.

1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
subterete +  and flattened +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
spreading +  and erect +
2 cm20 mm <br />0.02 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
cushionlike +
5 cm50 mm <br />0.05 m <br /> (6 cm60 mm <br />0.06 m <br />) +
spaced +  and adjacent +
gray +  and tan +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
deciduous +  and persistent +
36 +  and 64 +
elliptic-deltate +
Donald J. Pinkava +
(Engelmann) F. M. Knuth in C. Backeberg and F. M. Knuth +
dark-brown +
Opuntia bigelovii +
proliferating +
flattened +  and cylindric +
Ariz. +, Calif. +, Nev. +, Mexico (Baja California Sur) +  and Mexico (Sonora) +
300-900 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 />) +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
indehiscent +
persistent +, long +  and deciduous +
22mm;40mm +
young +  and not proliferating +
tuberculate +
cylindric +  and broadly obconic +
fleshy-leathery +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
as very narrow marginal ridge +  and smooth +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Mojave and Sonoran deserts, sandy flats, gravelly to rocky washes, bajadas, hillsides +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 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 +
gelatinous +
sometimes covered by outgrowths of proximal portion of style base or of flower tube wall +  and open +
persistent +  and deciduous +
Flowering spring–fall (Mar–Jun, Sep). +
ridgelike +  and nipple--shaped +
in C. Backeberg and F. M. Knuth, Kaktus-ABC, +
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 />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
warped;angular;squarish +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Illustrated +
deciduous +  and persistent +
conspicuous +
10 (?) +  and 15 (?) +
flattened +
hard +  and rigid +
decurrent +
winged +  and unsegmented +
tuberculate +  and smooth +
subwhorled +  and whorled +
13 cm130 mm <br />0.13 m <br /> (18 cm180 mm <br />0.18 m <br />) +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
green +  and gray-green +
4 cm40 mm <br />0.04 m <br /> (13 cm130 mm <br />0.13 m <br />) +
4 cm40 mm <br />0.04 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
segmented +
woody +  and succulent +
light +  and dark green +
light green +
Opuntia sect. Cylindropuntia +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Cylindropuntia bigelovii var. bigelovii +
Cylindropuntia bigelovii +
variety +
dull +  and glossy +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
terrestrial;epiphytic or epipetric +
gray +, white-yellow +  and brownish +