Sclerocactus glaucus

(K. Schumann) L. D. Benson

Cact. Succ. J. (Los Angeles) 38: 53. 1966.

Common names: Uinta Basin hookless cactus
EndemicConservation concern
Basionyms: Echinocactus glaucus K. Schumann Gesamtbeschr. Kakt., 438. 1898
Synonyms: Ferocactus glaucus (K. Schumann) N. P. Taylor Pediocactus glaucus (K. Schumann) Arp Sclerocactus whipplei var. glaucus (K. Schumann) S. L. Welsh
Treatment appears in FNA Volume 4. Mentioned on page 200.

Stems usually unbranched, cylindric to elongate cylindric, 3–12 (–28) × 4–9 cm; ribs (8–) 12–13 (–15), tubercles evident on ribs. Spines slightly or not at all obscuring stems; radial spines (2–) 6–8 (–12) per areole, white, 0–17 mm; central spines 1–3 (–5) per areole, sometimes not greatly different from radial spines; abaxial central spines 0–2 per areole, brown, reddish-brown to black, straight (rarely curved or hooked), 12–26 × 0.8–1 mm; lateral central spines 2–4 per areole, similar to abaxial; adaxial central spine 1 per areole, usually white (rarely light-brown), elliptic in cross-section, 15–31 × 0.5–1.8 mm. Flowers fragrant, funnelform (rarely campanulate), 3–5 (–6) × (3–) 4–5 cm; outer tepals with greenish lavender midstripes and pink margins, oblanceolate, 25–30 × 4–6 mm; inner tepals pink (rarely pale-pink), oblanceolate to lanceolate, 24–30 (–35) × 4–6 mm; filaments green to white; anthers yellow. Fruits not regularly dehiscent, ovoid, barrel-shaped, 9–22 (–30) × 8–12 mm, dry, with a few membranous scales, mostly near the apex. Seeds black, 1.5 × 2.5 mm; testa with rounded papillae.


Phenology: Flowering late Apr–May.
Habitat: Exposed, gravel-covered, clay hills, saltbush or sagebrush flats, or pinyon-juniper woodlands
Elevation: 1400-2000 m

Discussion

Of conservation concern.

Sclerocactus glaucus is known only from Grand Junction area south to near Montrose, Colorado. The systematic and taxonomic confusion involving S. glaucus has been reviewed by K. D. Heil and J. M. Porter (1994); however, in their revision of Sclerocactus, S. wetlandicus was included within their circumscription of S. glaucus. Chloroplast DNA data (J. M. Porter et al. 2000) are consistent with F. Hochstätter’s (1997) assertion that these represent two taxa. Even so, S. glaucus and S. wetlandicus are morphologically very similar and in the herbarium may be very difficult to discriminate without resorting to scanning electron microscopy (SEM) or a determination based upon geography. The surface of the epidermal cells of S. wetlandicus and S. brevispinus is flattened; this can be observed easily at 20×, but only with some difficulty at 10×. The cells are convex with a flattened apex, like a hill that was strip mined, lacking the conoidal projection; whereas, those of S. glaucus are rounded.

Selected References

None.

Lower Taxa

None.

... more about "Sclerocactus glaucus"
reddish-brown +  and black +
1.2 cm12 mm <br />0.012 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (3.1 cm31 mm <br />0.031 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
cushionlike +
spine-bearing +
circular to linear +
deciduous +  and persistent +
connected +
elliptic +  and pyriform +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Kenneth D. Heil +  and J. Mark Porter +
(K. Schumann) L. D. Benson +
hardened +
Echinocactus glaucus +
triangular +
pink +  and purplish-pink or black +
subulate +  and acicular +
proliferating +
flattened +  and cylindric +
Uinta Basin hookless cactus +
mucilaginous +
notched +
1400-2000 m +
not separating +
green +  and white +
5 cm50 mm <br />0.05 m <br /> (6 cm60 mm <br />0.06 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
fragrant +
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 />) +
2.2 cm22 mm <br />0.022 m <br /> (3 cm30 mm <br />0.03 m <br />) +
2.1 cm21 mm <br />0.021 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
red;pink;tan;green +
persistent +, long +  and deciduous +
9mm;22mm +
barrel--shaped +  and ovoid +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Exposed, gravel-covered, clay hills, saltbush or sagebrush flats, or pinyon-juniper woodlands +
3 cm30 mm <br />0.03 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
2.4 cm24 mm <br />0.024 m <br /> (3 cm30 mm <br />0.03 m <br />) +
oblanceolate +  and lanceolate +
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 +
0.7 cm7 mm <br />0.007 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
fimbriate +  and entire +
greenish lavender +
Purple (?) +, Pink (?) +, Rose (?) +, Gold (?) +, Cream (?) +  and White (?) +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
deciduous +  and persistent +
Flowering late Apr–May. +
mucilaginous +
abscission +
ridgelike +  and nipple--shaped +
Cact. Succ. J. (Los Angeles) +
greenish +  and white +
tuberculate +
triangular +
membranous +
thin +  and broad +
arillate +  and strophiolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (?) +
shiny +  and glossy +
obovoid;pyriform;obovoid;pyriform;lenticular-reniform;comma--shaped;spheric +
2.5 cm25 mm <br />0.025 m <br /> (?) +
Endemic +  and Conservation concern +
curved +  and straight +
deciduous +  and persistent +
6 (?) +  and 8 (?) +
annulate-ridged +, hairlike +, daggerlike +, subulate +  and acicular +
0 cm0 mm <br />0 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
hard +  and rigid +
decurrent +
15 cm150 mm <br />0.15 m <br /> (20 cm200 mm <br />0.2 m <br />) +
pale +  and dark green or bluish green +
3cm;12cm +
cylindric +  and elongate +
succulent +
4cm;9cm +
creamy white +, yellow +, green +  and pink +
flat-topped +
tuberculate +
Ferocactus glaucus +, Pediocactus glaucus +  and Sclerocactus whipplei var. glaucus +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Sclerocactus glaucus +
Sclerocactus +
species +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
lanceolate to oblanceolate +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
dull +  and glossy +
papillate +
coalescent +
distinct +
epiphytic;epiphytic;epiphytic +
barrel-shaped +  and spheric +