Echinocereus pectinatus |
Echinocereus pseudopectinatus |
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Mexican comb hedgehog, rainbow cactus |
devilthorn |
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Habit | Plants unbranched (rarely few branched). | |
Stems | erect, short cylindric, to 20 × 4–6 cm; ribs 13–19, crests slightly undulate; areoles 4–8 mm apart. |
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Spines | 13–17 per areole, stiff and straight, white, pink, or gray, becoming gray with dark tips; radial spines 12–17 per areole, appressed to spreading, 2–12 mm; central spines (0–)1–4 per areole, projecting, 1–4 mm. |
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Flowers | 5–8 × 7–10 cm; flower tube 15–25 × 8–20 mm; flower tube hairs 3–5 mm; inner tepals purplish pink, darker proximal portion and midstripes, 35–45 × 10–22 mm, tips relatively thin and delicate; anthers dark yellow; nectar chamber to 3 mm. |
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Fruits | dark green, brownish tinged, 15–23 mm, pulp white. |
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Echinocereus pectinatus |
Echinocereus pseudopectinatus |
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Phenology | Flowering times not well known; fruiting 2 months after flowering. | |
Habitat | Chihuahuan Desert, desert scrub, mostly semidesert grasslands, rocky slopes, mostly igneous substrates | |
Elevation | 1200-1400 m (3900-4600 ft) | |
Distribution |
TX; n Mexico
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AZ; Mexico (Sonora) |
Discussion | Varieties 2 (1 in the flora). At least in the United States, Echinocereus pectinatus (diploid) has only pink or purple flowers, unlike the polymorphic species E. dasyacanthus (tetraploid). Echinocereus pectinatus differs from the entire E. reichenbachii species group in that the areoles of its relatively thick-walled flower tube have stouter spines and much shorter hairs. Superficially similar species west of the Continental Divide, formerly associated with E. pectinatus (E. pseudopectinatus, E. rigidissimus, and some Sonoran species), are more closely related to the E. reichenbachii species group with densely bristly flower buds and delicate, ephemeral inner tepals. Echinocereus pectinatus var. pectinatus is endemic to Mexico; reports from the United States were misidentifications of var. wenigeri, E. pseudopectinatus (in Arizona), and unusually short-spined plants of E. dasyacanthus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Misidentifications of Echinocereus pseudopectinatus were the basis for Arizona reports of E. pectinatus and E. dasyacanthus, which belong to an unrelated species group from the Chihuahuan Desert. Formerly, E. pseudopectinatus was considered conspecific with E. bristolii W. T. Marshall, a closely related endemic species of Sonora, Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 4. | FNA vol. 4. |
Parent taxa | Cactaceae > subfam. Cactoideae > Echinocereus | Cactaceae > subfam. Cactoideae > Echinocereus |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Echinocactus pectinatus | E. bristolii var. pseudopectinatus, E. scopulorum subsp. pseudopectinatus |
Name authority | (Scheidweiler) Engelmann: in F. A. Wislizenus, Mem. Tour N. Mexico, 109. (1848) | (N. P. Taylor) N. P. Taylor: Bradleya 7: 74. (1989) |
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