Echinocereus pectinatus var. wenigeri

L. D. Benson

Cact. Succ. J. (Los Angeles) 40: 124, fig. 3. 1968.

Common names: Weniger’shedgehog ashy white ra inbow cactus langtry rainbow cactus
Treatment appears in FNA Volume 4. Treatment on page 163. Mentioned on page 164.

Plants unbranched or few branched from near base in old age. Stems erect, short cylindric or sometimes spheric, 8–17 (–25) × 5.6–8 (–10) cm; ribs (13–) 14–18, crests slightly undulate; areoles 4–15 mm apart. Spines (14–) 17–26 (–31) per areole, straight, tightly appressed (radial spines) or strongly projecting (central spines), presenting smooth general aspect to plant, ashy white, never pink, largest spines tipped purplish brown, annual growth increments not marked by rings of different color; radial spines (13–) 15–24 (–26) per areole, 7–10 (–13) mm; central spines (1–) 2–6 (–7) per areole, short, inconspicuous, nearly terete, (2.2–) 4–6 mm. Flowers 7–9 (–11) × (5–) 5.5–10 (–13) cm; flower tube 10–15 × 15–25 mm; flower tube hairs 2–3 (–5) mm; inner tepals often stiffly ascending, pink or magenta, white in proximal 1/2, green near base (distal colored portion varying greatly in extent), 34–62 × 7–19 mm, tips relatively thin and delicate; anthers yellow; nectar chamber 2–6 mm. Fruits dark purplish, 25–30 mm, pulp white to pink. 2n = 22.


Phenology: Flowering Mar–May; fruiting May–Jul.
Habitat: Tamaulipan thorn scrub, degraded grasslands, often with Juniperus pinchotii, Chihuahuan desert scrub, limestone outcrops
Elevation: 300-900[-1700] m

Discussion

Plants of Echinocereus pectinatus var. wenigeri are entirely whitish in aspect, without the conspicuous annual color banding characteristic of other “rainbow cacti” and without the gloss, luster, or translucency generally perceived in fresh spines. Without flowers or fruits, this variety is easily misidentified as E. reichenbachii, with which it sometimes grows sympatrically. Echinocereus pectinatus has white-centered flowers (with green throats, forming a target pattern) whereas E. dasyacanthus flowers, irrespective of color form, have only the greenish throats and no white bands on the inner tepals.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

cushionlike +
circular to linear +
deciduous +  and persistent +
hourglass--shaped +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Allan D. Zimmerman +  and Bruce D. Parfitt +
L. D. Benson +
hardened +
Echinocactus pectinatus +
triangular +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
curved +  and straight +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
proliferating +
flattened +  and cylindric +
Weniger’shedgehog +, ashy white ra inbow cactus +  and langtry rainbow cactus +
mucilaginous +
undulate +
Tex. +  and Mexico (Coahuila) +
300-900[-1700] m +
not separating +
9 cm90 mm <br />0.09 m <br /> (11 cm110 mm <br />0.11 m <br />) +
10 cm100 mm <br />0.1 m <br /> (13 cm130 mm <br />0.13 m <br />) +
7 cm70 mm <br />0.07 m <br /> (9 cm90 mm <br />0.09 m <br />) +
unisexual +  and bisexual +
2.6 cm26 mm <br />0.026 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
5.5cm;10cm +
dark purplish +
dehiscent +  and indehiscent +
persistent +, long +  and deciduous +
spheric +  and narrowly obovoid +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Tamaulipan thorn scrub, degraded grasslands, often with Juniperus pinchotii, Chihuahuan desert scrub, limestone outcrops +
Green (?) +, White (?) +, Magenta (?) +  and Pink (?) +
3.4 cm34 mm <br />0.034 m <br /> (6.2 cm62 mm <br />0.062 m <br />) +
brown +  and tipped purplish +
deciduous +  and persistent +
rudimentary +
flat +  and terete +
nearly +  and microscopic +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
tuberculate +
fluted;spheric;depressed-spheric or club-shaped +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
smooth +  and tuberculate +
deciduous +  and persistent +
Flowering Mar–May +  and fruiting May–Jul. +
mucilaginous +
ridgelike +  and nipple--shaped +
Cact. Succ. J. (Los Angeles) +
white +  and pink +
triangular +
arillate +  and strophiolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
rugose +  and tuberculate +
spheric;obovoid +
tuberculate +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
pink +  and ashy white +
straight +
deciduous +
3mm +  and 150mm +
projecting +  and appressed +
15 (?) +  and 24 (?) +
roughened +  and smooth +
acicular +  and subulate +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
decurrent +
unsegmented +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
yellow-green +  and dark green +
8cm;17cm +
spheric +  and cylindric +
0 cm0 mm <br />0 m <br /> (40 cm400 mm <br />0.4 m <br />) +
succulent +
5.6cm;8cm +
yellowish green +  and green +
tuberculate +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Echinocereus pectinatus var. wenigeri +
Echinocereus pectinatus +
variety +
dull +  and glossy +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
branched +, few +  and unbranched +
epiphytic;epiphytic;epiphytic +
decumbent +, pendent +, sprawling +, ascending +  and erect +
barrel-shaped +  and spheric +