Coryphantha sneedii

(Britton & Rose) A. Berger

Kakteen, 280. 1929.

Common names: Carpet foxtail cactus
Conservation concern
Basionym: Escobaria sneeedii Britton & Rose Cact. 4: 56, fig. 54. 1923 Escobaria sandbergii P. Pierce & K. H. Schwerin Escobaria villardii P. Pierce & K. H. Schwerin
Synonyms: Coryphantha albicolumnaria (Hester) Dale A. Zimmerman Coryphantha orcuttii (Boedeker) Dale A. Zimmerman Coryphantha organensis Dale A. Zimmerman Coryphantha sneedii var. leei (Rose & Boedeker) L. D. Benson Coryphantha strobiliformis var. orcuttii (Boedeker) L. D. Benson Escobaria guadalupensis Castetter
Treatment appears in FNA Volume 4. Mentioned on page 222, 223, 229, 230.

Plants branched (with age to 250 branches in some populations), most branches of largest clumps often immature, usually stiff and erect, white, stem obscured by spines. Roots diffuse but ± fleshy or short taproots, largest roots basally less than ± 1/3 of stem diam., often dying in age, root system then diffuse adventitious-roots. Stems protruding above ground level for at least 1/2 its length, spheric at first, later cylindric or clavate, 3–27 × 1.3–7 (–10) cm; tubercles 3.5–12 × 2.5–6 mm, stiff; areolar glands absent; parenchyma not mucilaginous; druses present, some large, 0.5–1 mm, lenticular, always conspicuous in old parts of stem; pith 1/5–1/3 of lesser stem diam.; medullary vascular system absent. Spines (31–) 37–76 (–95) per areole, all bright snowy white or, if ± pigmented (in some populations especially on igneous rock), then central spines tan, stramineous, golden yellow, pale chalky pink, pale purplish gray, or pinkish brown (rarely dark-brown), palest when fresh, weathering through gray to black, dark tips usually only on largest central spines, usually pink to orangebrown or purplish brown (very rarely blackish); radial spines (18–) 25–52 (–73) per areole (12–45 per areole on immature branches), ± appressed or tightly appressed, 3–14 × (0.01–) 0.05–0.2 mm diam.; subcentral spines (0–) 1–5 (–10) per areole in adaxial part of cluster; outer central spines (5–) 8–17 (–23) per areole, appressed or strongly projecting; inner central spines (0–) 1–5 (–12) per areole, always radiating like spokes on adult plants, porrect (all appressed), straight, longest spines 3–25.5 × 0.2–0.5 (–0.6) mm. Flowers nearly apical, 11–28 × 7–25 mm; outer tepals sparsely to densely fringed; inner tepals ca. 11–26 per flower, generally white, cream, pale tan, greenish white, or pale-rose-pink, midstripes usually ± sharply defined (sometimes absent), pink often suffused with brown, tan, yellowish, reddish, magenta, purple, lavender, or green, sometimes appearing pale orange proximally, mirroring anthers, or proximally pure white or faintly tinted with green, cream, or dull purplish red to bright pink, 5–14 × 0.8–4 mm; outer filaments white to cream, pinkish, dull purplish red, or magenta (sometimes white proximally, colored distally), usually not contrasting with inner tepals; anthers sulphur yellow or canary yellow; stigma lobes 2–7, white (rarely pale-pink or yellowish white), 1–3 mm. Fruits dimorphic, either “red” color phase (blood red or crimson throughout, sometimes tinted with magenta) or “green” color phase (pale green or yellow-green, sometimes exposed parts brownish green, pinkish, bright-yellow, dull orange, dull reddish purple, or pinkish brown, rarely dull brownish red throughout), cylindric to fusiform or obovoid to narrowly clavate, often distorted from lateral pressure of adjacent tubercles, 5.5–21 × 2.5–8 mm, juicy when fresh, ± quickly drying, smaller fruits less succulent; floral remnant persistent. Seeds bright reddish-brown or brownish orange, weathering to dull brown, ± comma-shaped, tending toward obovoid, (0.9–) 1–1.6 mm, distinctly pitted. 2n = 22.


Phenology: Flowering Mar–Jun; fruiting May–Sep.
Habitat: Chihuahuan desert scrub to conifer woodlands, rock outcrops (rarely alluvial rubble), usually narrowly confined to limestone
Elevation: 600-2600 m

Distribution

V4 431-distribution-map.gif

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

Discussion

Of conservation concern.

Coryphantha sneedii, in the broad sense, is confusingly variable but less diverse than C. vivipara. Although it is closely related to C. vivipara, certain other species are more difficult to discriminate. Sympatric C. dasyacantha and C. tuberculosa are easily misidentified; identification without seeds or fresh flowers depends heavily on the lenticular druses in the pith and cortex of C. sneedii. The druses, also characteristic of C. vivipara, C. chlorantha, and C. alversonii, are about 0.6–1.0 mm diam. (conspicuous white flecks to the naked eye and strongly granular to the touch, like grains of sand in the tissue), in contrast to the tiny spheroid druses (less than 0.4 mm in diameter) found in most tissues throughout the genus.

Sterile specimens of Coryphantha sneedii with large stems sometimes are nearly identical to certain forms of C. vivipara, but all C. vivipara populations have much larger flowers, fruits, and seeds. Young immature plants of C. vivipara lack the diagnostic medullary vascular system that otherwise distinguishes C. vivipara from C. sneedii, and the age at which it is developed may differ from one population to another.

Selected References

None.

Lower Taxa

None.
... more about "Coryphantha sneedii"
canary yellow +, sulphur yellow +  and pale orange +
cushionlike +
circular to linear +
deciduous +  and persistent +
connected +
hourglass--shaped +
Allan D. Zimmerman +  and Bruce D. Parfitt +
(Britton & Rose) A. Berger +
spineless +  and naked +
hardened +
Escobaria sneeedii +, Escobaria sandbergii +  and Escobaria villardii +
triangular +
usually pink +  and orangebrown or purplish brown +
curved +  and straight +
0.4 cm4 mm <br />0.004 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
proliferating +
flattened +  and cylindric +
Carpet foxtail cactus +
with mucilage +  and mucilaginous +
Ariz. +, N.Mex. +, Tex. +  and Mexico (Chihuahua) +
conspicuous +
lenticular +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
600-2600 m +
not separating +
1.1 cm11 mm <br />0.011 m <br /> (2.8 cm28 mm <br />0.028 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 />) +
7mm;25mm +
indehiscent +
persistent +, long +  and deciduous +
5.5mm;21mm +
distorted +, cylindric +  and fusiform or obovoid +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Chihuahuan desert scrub to conifer woodlands, rock outcrops (rarely alluvial rubble), usually narrowly confined to limestone +
0.45 cm4.5 mm <br />0.0045 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 +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
3mm +  and 25.5mm +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
fringed +  and toothed +
small +
faintly tinted with green punct cream or dull purplish red +  and bright pink +
0.5 cm5 mm <br />0.005 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.8mm +  and 4mm +
projecting +  and appressed +
white +  and cream pinkish dull purplish red or magenta +
not mucilaginous +
deciduous +  and persistent +
Flowering Mar–Jun +  and fruiting May–Sep. +
mucilaginous +
1/5 +  and 1/3 +
ridgelike +  and nipple--shaped +
colorless +  and white greenish or pinkish +
3;2;2;30 +
erose +  and entire +
rudimentary +
triangular +
arillate +  and strophiolate +
weathering +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
comma--shaped +
Conservation concern +
adventitious +
pigmented +, , +, white +  and bright snowy +
curved +  and straight +
0.05mm +  and 0.2mm +
deciduous +  and persistent +
25 (?) +  and 52 (?) +
annulate-ridged +, hairlike +, daggerlike +, subulate +  and acicular +
hard +  and rigid +
differentiated +
decurrent +
unsegmented +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
3cm;27cm +
protruding +  and obscured +
tuberculate +
clavate +, cylindric +  and spheric +
succulent +
1.3cm;7cm +
protruding +  and flat +
large +  and small +
tuberculate +
Coryphantha albicolumnaria +, Coryphantha orcuttii +, Coryphantha organensis +, Coryphantha sneedii var. leei +, Coryphantha strobiliformis var. orcuttii +  and Escobaria guadalupensis +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Coryphantha sneedii +
Coryphantha +
species +
dull +  and glossy +
pitted +  and raised-reticulate +
dark +, gray +  and black +
3.5mm +  and 12mm +
conic +  and hemispheric or cylindric +
2.5mm +  and 6mm +
epiphytic;epiphytic;epiphytic +