Echinocereus bonkerae
Echinocereus triglochidiatus
bonker hedgehog, pinkflower hedgehog cactus
claret-cup cactus, claretcup, kingcup cactus, Mojave mound cactus
mostly erect, ovoid to cylindric, 15–30(–50) × 3.5–7 cm;
ribs (11–)12–18(–20), crests slightly undulate;
areoles 8–20 mm apart.
usually erect or nearly so, cylindric (spheric), (2–)5–70 × (3–)5–13 cm;
ribs 5–8 or 8–12, crests slightly undulate (localized populations contain plants with strongly interrupted ribs);
areoles 10–40 mm apart.
(9–)12–17 per areole, straight in short-spined forms, sometimes curved or twisted in long-spined forms, appressed (radial spines) or porrect to spreading or descending (central spines when present), dull yellowish to brown or white to gray, often brown to black especially at bases or tips;
radial spines (9–)11–16 per areole, 5–18 mm;
central spines (0–)1(–3) per areole, 2–100 mm, white to yellow or brown, often becoming gray, all terete.
(0–)3–11 per areole, straight to curved or contorted, appressed (radial spines) or spreading to projecting outward (some radials and central spines when present), white to yellow, gray, or black;
radial spines (0–)1–10 per areole, (0–)15–90 mm;
central spines 0–1(–4) per areole, angular, (0–)50–120 mm.
5–7 × 4–9 cm;
flower tube 12–20 × 10–30 mm;
flower tube hairs 1 mm;
inner tepals deep magenta (to dark purple) with darker midstripes, proximally green (to very dark purple), 20–60 × 8.5–20 mm, tips relatively thin and delicate;
anthers yellow;
nectar chamber 2–4 mm.
(4–)5–10 × 3–7 cm;
flower tube 20–35 mm;
flower tube hairs 1–2 mm;
inner tepals bright orange-red to dark red, proximally paler (bases sometimes yellow or white), (18–)25–40 × (5–)10–15 mm, tips thick and rigid;
anthers usually pink to purple;
nectar chamber 5–11 mm.
bright red or orange red, 15–25 mm, pulp white (or pale pink).
green to yellow-green or pink (rarely red), (15–)20–35 mm, pulp white.
= 22.
= 22.
Echinocereus bonkerae
Echinocereus triglochidiatus
Plants in most populations of Echinocereus bonkerae have radial spines almost pectinately arranged and central spines very short or absent, creating the superficial appearance of E. dasyacanthus, E. pectinatus, or similar species. Formerly, all short-spined plants in central and southern Arizona were treated as E. bonkerae, including unusually short-spined individuals of E. fendleri and E. fasciculatus. Today we recognize that E. bonkerae, E. fendleri, and E. fasciculatus all vary from short-spined to long-spined.
Populations at the lowest altitude for the species have taller stems and unusually long, slender central spines (to 10 cm); they have recently been named Echinocereus apachensis. Such plants were part of the basis for L. D. Benson’s polyphyletic concept (1969, 1982) of E. fasciculatus var. boyce-thompsonii (see 8. E. fasciculatus).
Echinocereus bonkerae is a poorly defined species, frequently lumped with E. fendleri or E. fasciculatus, and it is not always identifiable in the field. Although rib number, blooming season, habitat preference, and, in particular regions, spine length or central spine presence are helpful characteristics, ploidy level is the most objective criterion for distinguishing E. bonkerae from E. fasciculatus. Immature plants of E. bonkerae are like E. fasciculatus and unlike the immature plants of E. fendleri, which are tuberculate with their spines long, few, soft, and often curved or twisted.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Echinocereus triglochidiatus is the earliest name for a large group of diploid and polyploid taxa treated as conspecific by L. D. Benson (1969, 1982). The tetraploids are now recognized separately as E. coccineus, including E. polyacanthus Engelmann of Mexico. The diploids in the flora area are here divided into two allopatric species: E. triglochidiatus and E. arizonicus.
Plants in the western portion of the range of Echinocereus triglochidiatus have been called E. triglochidiatus var. mojavensis (Engelmann & J. M. Bigelow) L. D. Benson. That taxon includes curly-spined plants (mainly in California) and straight-spined plants (including most populations in Arizona, Utah, and western Colorado). The latter were mapped by L. D. Benson (1969, 1982) as part of his concept of E. triglochidiatus var. melanacanthus. Plants with the fewest and largest spines, called E. triglochidiatus var. triglochidiatus, occupy the eastern portion of the species’ distribution. The largest spines, whether central or radial, of var. triglochidiatus are sharply angular in cross section and 1–2 mm thick.
Less distinctive plants have been called Echinocereus triglochidiatus var. gonacanthus, a name carelessly applied to miscellaneous plants throughout the range of var. triglochidiatus. A well-known population at White Sands, New Mexico, inhabits saline flats adjacent to pure gypsum dunes. The unusually large, southernmost plants at White Sands, New Mexico, shrink to the same size as northern plants when grown together in a common garden (D. Weniger 1970). The epithet inermis has been applied at various taxonomic ranks to individual plants with spines absent or nearly so in the eastern portion of var. mojavensis (in and around southeastern Utah).
A geographically distant tetraploid, Echinocereus coccineus var. paucispinus, superficially resembles some eastern E. triglochidiatus but may be distinguished by its relatively terete and more consistently straight spines. Small plants of var. triglochidiatus without reproductive structures might be confused with E. fendleri; records of E. triglochidatus from near the Mexican border probably are misidentifications of E. fendleri in vegetative condition.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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