Echinocactus polycephalus var. xeranthemoides

J. M. Coulter

Contr. U.S. Natl. Herb. 3: 358. 1896.

Endemic
Synonyms: Echinocactus polycephalus subsp. xeranthemoides (J. M. Coulter) N. P. Taylor
Treatment appears in FNA Volume 4. Treatment on page 190.

Stems gray-green to yellow-green. Spines red to straw colored, canescent, puberulent, or glabrous. Fruit scales tan, yellow, or reddish, aging yellow, 16–30 mm, usually longer than dried tepals at fruit apex. Seeds rounded (rarely faceted), 2.4–3.1 mm, smooth (exposed surfaces of testa cells flat or slightly convex, uniformly shiny). 2n = 22.


Phenology: Flowering Jun–Aug.
Habitat: Rocky hills, slopes, and ledges of canyons, Great Basin and Mojave desert scrub, igneous and calcareous substrates
Elevation: 500-1700 m

Discussion

Selected References

None.

Lower Taxa

None.
cushionlike +
confluent +  and spaced +
circular to linear +
deciduous +  and persistent +
nearly circular +  and oblong +
Allan D. Zimmerman +  and Bruce D. Parfitt +
J. M. Coulter +
hardened +
triangular +
2 +  and 50 +
hemispheric +  and hexagonally faceted +
straight +  and curved +
ridged +, flattened +  and terete +
proliferating +
flattened +  and cylindric +
not mucilaginous +
Ariz. +  and Nev. +
500-1700 m +
not separating +
5.5 cm55 mm <br />0.055 m <br /> (5.8 cm58 mm <br />0.058 m <br />) +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (15 cm150 mm <br />0.15 m <br />) +
narrower;4cm;6cm +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
whitish tan;pinkish +
persistent +, long +  and deciduous +
10mm;50mm +
1.6 cm16 mm <br />0.016 m <br /> (3 cm30 mm <br />0.03 m <br />) +
dry +, fleshy +  and juicy +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Rocky hills, slopes, and ledges of canyons, Great Basin and Mojave desert scrub, igneous and calcareous substrates +
pale tan +  and white +
2.4 cm24 mm <br />0.024 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
2.4 cm24 mm <br />0.024 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
0.3cm;1.5cm +
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 +
spine-tipped +, serrate +  and entire +
fimbriate +, entire +  and toothed +
deciduous +  and persistent +
Flowering Jun–Aug. +
not mucilaginous +
dehiscent +, , +, rupturing +  and indehiscent +
abscission +
ridgelike +  and nipple--shaped +
Contr. U.S. Natl. Herb. +
curving +
not constricted +
prominent +
broadly rounded +  and nearly keeled +
yellow +  and reddish +
triangular +
arillate +  and strophiolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
dull +  and shiny +
rounded +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
red +  and straw colored +
straight +  and curved +
deciduous +  and persistent +
glabrous +, puberulent +  and canescent +
6 (?) +  and 14 (?) +
annulate-ridged +, flattened +  and abaxially ridged +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
decurrent +
unsegmented +
9 cm90 mm <br />0.09 m <br /> (15 cm150 mm <br />0.15 m <br />) +
gray-green +  and yellow-green +
15cm;40cm +
spheric +  and short cylindric +
succulent +
canescent +  and glabrous +
15cm;30cm +
protruding +  and hidden +
tuberculate +
Echinocactus polycephalus subsp. xeranthemoides +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Echinocactus polycephalus var. xeranthemoides +
Echinocactus polycephalus +
variety +
flat +  and convex +
dull +  and glossy +
canescent +  and glabrous +
spinelike +
epiphytic;epiphytic;epiphytic +
not deep-seated +
barrel-shaped +  and spheric +