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.
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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.
Allan D. Zimmerman +  and Bruce D. Parfitt +
L. D. Benson +
Echinocactus pectinatus +
Weniger’shedgehog +, ashy white ra inbow cactus +  and langtry rainbow cactus +
Tex. +  and Mexico (Coahuila). +
300-900[-1700] m +
Tamaulipan thorn scrub, degraded grasslands, often with Juniperus pinchotii, Chihuahuan desert scrub, limestone outcrops +
Flowering Mar–May +  and fruiting May–Jul. +
Cact. Succ. J. (Los Angeles) +
Echinocereus pectinatus var. wenigeri +
Echinocereus pectinatus +
variety +