Echinocereus arizonicus

Rose ex Orcutt

Cactography 1926(1): 3. 1926.

Common names: Arizona claret-cup cactus Arizona hedgehog cactus
Illustrated
Synonyms: Echinocereus coccineus var. arizonicus (Rose ex Orcutt) D. J. Ferguson Echinocereus triglochidiatus var. arizon icus (Rose ex Orcutt) L. D. Benson
Treatment appears in FNA Volume 4. Mentioned on page 168.

Plants few-to-many branched. Stems usually erect, cylindric, 10–40 × 5–10 cm; ribs 8–13, slightly undulate; areoles 10–15 mm apart. Spines [8–] 9–18 per areole, straight or contorted; radial spines 7–14 per areole, appressed, yellowish to brownish, becoming gray, 5–25 mm; central spines 1–4 (c Arizona and Mexico) or 3–8 (elsewhere) per areole, spreading to projecting outward, brownish yellow to reddish black, becoming gray, terete (c Arizona) or angled to terete (elsewhere), 15–50 mm. Flowers 5.5–7 × 3.5–5 cm; flower tube 25–35 mm; flower tube spines 5–15 mm, hairs to 2 mm; inner tepals bright-orange-red to dark red distally, proximally paler (bases sometimes yellow or whitish), 25–40 × (5–) 10–15 mm, tips thick and rigid; anthers pink to brick-red or purple; nectar chamber 6–10 mm. Fruits green, brownish tinged, 20–30 mm, pulp white. 2n = 22.


Phenology: Flowering Apr–May; fruiting May–Jul.
Habitat: Chihuahuan Desert, desert scrub, interior chaparral, desert grasslands, steep walls of canyons, limestone hills, among granite boulders
Elevation: 1400-1900 m

Distribution

V4 322-distribution-map.gif

Ariz., N.Mex., Mexico (Chihuahua)

Discussion

Some populations of diploid claret-cup cacti in southeastern Arizona and southwestern New Mexico have recently been named Echinocereus arizonicus subsp. nigrihorridispinus W. Blum & Rutow, including numerous eastern populations previously misidentified as other taxa. Subspecies arizonicus, of conservation concern, remains known only from central Arizona. Infraspecific taxa within E. arizonicus are not treated formally here because their taxonomic boundaries remain controversial.

Echinocereus arizonicus superficially resembles the dioecious tetraploid E. coccineus var. rosei of the Chihuahuan Desert, and several of its populations were mapped by L. D. Benson (1969, 1982) as part of E. triglochidatus var. neomexicanus (Standley) Standley ex W. T. Marshall. Echinocereus arizonicus subsp. nigrihorridispinus superficially resembles the partially sympatric, synoecious tetraploid recently named E. santaritensis W. Blum & Rutow (a hermaphroditic geographic race of E. coccineus), which has much longer hairs on the flowers, a narrower flower tube, and relatively slender spines. Irrespective of the misleading vegetative similarities between diploid E. arizonicus and its polyploid relatives, E. arizonicus differs strongly from both varieties of the diploid E. triglochidiatus.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Echinocereus arizonicus"
pink +  and brick-red or purple +
cushionlike +
circular to linear +
deciduous +  and persistent +
hourglass--shaped +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Allan D. Zimmerman +  and Bruce D. Parfitt +
Rose ex Orcutt +
hardened +
triangular +
gray +, brownish yellow +  and reddish black +
curved +  and straight +
spreading +  and projecting +
angled +  and terete +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
proliferating +
flattened +  and cylindric +
Arizona claret-cup cactus +  and Arizona hedgehog cactus +
mucilaginous +
undulate +
Ariz. +, N.Mex. +  and Mexico (Chihuahua) +
1400-1900 m +
not separating +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
5.5 cm55 mm <br />0.055 m <br /> (7 cm70 mm <br />0.07 m <br />) +
unisexual +  and bisexual +
2.6 cm26 mm <br />0.026 m <br /> (5 cm50 mm <br />0.05 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
3.5cm;5cm +
brownish tinged;green +
dehiscent +  and indehiscent +
persistent +, long +  and deciduous +
spheric +  and narrowly obovoid +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Chihuahuan Desert, desert scrub, interior chaparral, desert grasslands, steep walls of canyons, limestone hills, among granite boulders +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
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 +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
smooth +  and tuberculate +
deciduous +  and persistent +
Flowering Apr–May +  and fruiting May–Jul. +
mucilaginous +
ridgelike +  and nipple--shaped +
Cactography +
undulate +
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 +
Illustrated +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
gray +, yellowish +  and brownish +
straight +
deciduous +
3mm +  and 150mm +
7 (?) +  and 14 (?) +
roughened +  and smooth +
acicular +  and subulate +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 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 +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
yellow-green +  and dark green +
10cm;40cm +
cylindric +
0 cm0 mm <br />0 m <br /> (40 cm400 mm <br />0.4 m <br />) +
succulent +
5cm;10cm +
yellowish green +  and green +
tuberculate +
Echinocereus coccineus var. arizonicus +  and Echinocereus triglochidiatus var. arizon +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Echinocereus arizonicus +
Echinocereus +
species +
dull +  and glossy +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
epiphytic;epiphytic;epiphytic +
decumbent +, pendent +, sprawling +, ascending +  and erect +
barrel-shaped +  and spheric +