Coryphantha dasyacantha

(Engelmann) Orcutt

Cactography 1926(1): 5. 1926.

Common names: Big Bend cactus
Endemic
Basionym: Mammillaria dasyacantha Engelmann Proc. Amer. Acad. Arts 3: 268. 1856 (as Mamilliaria)
Synonyms: Escobaria dasyacantha (Engelmann)B ritton & Rose Escobesseya dasyacantha (Engelmann) Hester
Treatment appears in FNA Volume 4. Treatment on page 230. Mentioned on page 224, 229.

Plants usually unbranched (rarely 2–5 branches), white or brown bristly stem. Roots diffuse (rarely short taproots). Stems spheric, becoming short cylindric in age, 4.5–10 (–17) × (2–) 3–4.5 (–6) cm (1–3 × 2–5 cm in Davis Mountains, Texas); tubercles (4–) 7–8 (–12) × 3–5 (–7) mm, moderately soft; areolar glands absent; parenchyma not mucilaginous, medullary vascular system absent. Spines 26–42 per areole, white with redbrown to nearly black tips (brown to reddish-brown with black tips in Davis Mountains); radial spines 21–31 per areole (12–22 in Davis Mountains), 6–9 (–10) mm; subcentral spines several, appressed; central spines (3–) 4–9 (–11) per areole (2 in Davis Mountains), spreading, straight, longest spines 12–17 × 0.2–0.3 (–0.4) mm. Flowers nearly apical, 15–30 × (10–) 13–15 (–22) mm, sterile distal part of flower tube 0–2 mm, shorter than stamen-bearing part; outer tepals conspicuously fringed; inner tepals 14 per flower, midstripes pinkish to brown or brownish green, proximally white, (7–) 8–10 (–12) × 1.5–3 mm; outer filaments white or colorless; anthers bright-yellow; stigma lobes 4 (–6), dark green to bright-yellow, 1–2.5 mm. Fruits bright red, clavate, cylindric, or narrowly ellipsoid, (7–) 13–27 (–35) × 3.5–6 (–7) mm, not very succulent; floral remnant strongly persistent. Seeds black, subspheric, 1–1.2 mm, pitted. 2n = 22.


Phenology: Flowering Mar–Jul; fruiting (May-)Jun–Aug, ca (1 1/2)-(2 1/2) months after flowering.
Habitat: Desert scrub with Larrea or Prosopis, on limestone, igneous rocks, gravelly bajadas, silty flats
Elevation: 800-1900 m

Discussion

Many published photographs and specimen citations purported to represent Coryphantha dasyacantha reflect misidentifications. Ripe fruits, with their strongly persistent floral remnant, provide the only simple way to distinguish C. dasyacantha from C. duncanii. The black fresh seeds of C. dasyacantha and related species usually provide immediate distinction from C. tuberculosa, C. sneedii, and C. vivipara, which have differently shaped, bright reddish brown fresh seeds. In addition, the greenish stigma lobes of C. dasyacantha, C. duncanii, C. chaffeyi, C. pottsiana, and certain Mexican taxa contrast with the violet or white stigma lobes of C. vivipara, C. sneedii, C. alversonii, and C. hesteri. Vegetatively, C. dasyacantha always is distinguishable from C. vivipara and C. sneedii by its lack of the unusually large druses described under 20. C. sneedii.

Selected References

None.

Lower Taxa

None.
... more about "Coryphantha dasyacantha"
4.5 cm45 mm <br />0.045 m <br /> (6 cm60 mm <br />0.06 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
bright-yellow +
cushionlike +
circular to linear +
deciduous +  and persistent +
connected +
hourglass--shaped +
Allan D. Zimmerman +  and Bruce D. Parfitt +
(Engelmann) Orcutt +
spineless +  and naked +
hardened +
Mammillaria dasyacantha +
triangular +
0.4 cm4 mm <br />0.004 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
proliferating +
flattened +  and cylindric +
Big Bend cactus +
with mucilage +  and mucilaginous +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
800-1900 m +
not separating +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 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 />) +
13mm;15mm +
2.7 cm27 mm <br />0.027 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
indehiscent +
persistent +, long +  and deciduous +
13mm;27mm +
ellipsoid +, cylindric +  and clavate +
succulent +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Desert scrub with Larrea or Prosopis, on limestone, igneous rocks, gravelly bajadas, silty flats +
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 +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
12mm +  and 17mm +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
fringed +  and toothed +
small +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
white +, pinkish +  and brown or brownish green +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1.5mm +  and 3mm +
colorless +  and white +
not mucilaginous +
stamen-bearing +
deciduous +  and persistent +
Flowering Mar–Jul +  and fruiting (May-)Jun–Aug, ca (1 1/2)-(2 1/2) months after flowering. +
mucilaginous +
ridgelike +  and nipple--shaped +
Cactography +
colorless +  and white greenish or pinkish +
3;2;2;30 +
erose +  and entire +
rudimentary +
triangular +
arillate +  and strophiolate +
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 />) +
glossy +  and shiny +
subspheric +
adventitious +
0.9 cm9 mm <br />0.009 m <br /> (1 cm10 mm <br />0.01 m <br />) +
curved +  and straight +
deciduous +  and persistent +
21 (?) +  and 31 (?) +
annulate-ridged +, hairlike +, daggerlike +, subulate +  and acicular +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
hard +  and rigid +
differentiated +
decurrent +
unsegmented +
4.5cm;10cm +
tuberculate +
cylindric +  and spheric +
succulent +
1cm;15cm +
dark green +  and bright-yellow +
protruding +  and flat +
large +  and small +
tuberculate +
Escobaria dasyacantha +  and Escobesseya dasyacantha +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Coryphantha dasyacantha +
Coryphantha +
species +
dull +  and glossy +
pitted +  and raised-reticulate +
redbrown +  and nearly black +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
7mm +  and 8mm +
conic +  and hemispheric or cylindric +
3mm +  and 5mm +
brown +  and white +
epiphytic;epiphytic;epiphytic +