Coryphantha robertii

A. Berger

Kakteen, 280. 1929.

Basionym: Escobaria runyonii Britton & Rose Cact. 4: 55, fig. 53, plate 6, fig. 1. 1923,
Synonyms: Coryphantha emskoetteriana (Quehl) A. Berger Coryphantha muehlbaueriana Boedeker
Treatment appears in FNA Volume 4. Treatment on page 229. Mentioned on page 222, 224.

Plants many branched, resulting in irregular masses of mostly immature stems that proliferate before reaching sexual maturity, clumps 10–30 (–100) cm diam., whitish bristly, spines nearly obscuring stem surface. Roots diffuse. Stems ovoid to cylindric, 3–6 × 1.5–3 cm; tubercles 4–8 × 3–5 mm, moderately soft; areolar glands absent; parenchyma not mucilaginous; druses in pith and cortex abundant but nearly microscopic; pith ca. 1/2 of lesser stem diam.; medullary vascular system absent. Spines (21–) 27–51 (–60?) per areole, snowy white or gray, except inner central spines pale-yellow or tan proximally, reddish-brown to nearly black in distal 1/2 or more; radial spines (18–) 24–41 per areole, (4–) 6–9 (–10) × 0.03–0.2 mm, adaxial 1–4 radial spines of fresh areoles on the largest stems greatly elongated, hairlike, ± contorted, semideciduous; subcentral spines 0–12 per areole; outer central spines (1–) 3–9 (–17) per areole, straight; inner central spines 0 (–1) per areole, ascending, descending, or porrect, other spines appressed or (usually) slightly projecting, some often descend from abaxial 1/2 of areole, (4–) 5–13 (–17.5) × 0.17–0.27 mm. Flowers nearly apical, 15–30 × 10–19 mm, sterile distal part of flower tube 0–2 mm, shorter than stamen-bearing part; outer tepals conspicuously fringed; inner tepals 14 per flower, sometimes shiny greenish yellow, usually with ± sharply defined midstripes of pinkish, brown, or brownish green, sometimes purplish-pink distally, margins and proximal portion white or cream, 8–12 × 1.5–3 mm; outer filaments white; anthers bright-yellow; stigma lobes 4 (–7), dark green to bright-yellow (rarely red), 1.5–2 mm. Fruits bright red throughout [sometimes green], ellipsoid, cylindric, or narrowly obovoid, 11–20 × 3–5 mm, not very succulent; floral remnant strongly persistent. Seeds black, even when fresh, ± spheric, pitted. 2n = 22.


Phenology: Flowering Feb–Mar; fruiting 2-3 months after flowering.
Habitat: Dense scrub, often with Leucophyllum, Agave lechuguilla, Echinocereus poselgeri, or Lophophora, limestone, gravel, or silt substrates
Elevation: 50-400 m

Distribution

V4 420-distribution-map.gif

Tex., Mexico (Coahuila), Mexico (Nuevo León), Mexico (Tamaulipas)

Discussion

An earlier name, Echinocactus pottsiana Poselger, may apply to the species here called Coryphantha robertii. The type specimen is fragmentary with squashed, disintegrated spine clusters, one seed, and vague locality data.

Coryphantha robertii is like C. sneedii in almost all respects, including nearly all variations of growth habit, phyllotaxy, spine color, spine arrangement/dimensions, floral morphology, fruit color dimorphism, and in most variations of tepal color.

Selected References

None.

Lower Taxa

None.
... more about "Coryphantha robertii"
1.3 cm13 mm <br />0.013 m <br /> (1.75 cm17.5 mm <br />0.0175 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.017 cm0.17 mm <br />1.7e-4 m <br /> (0.027 cm0.27 mm <br />2.7e-4 m <br />) +
bright-yellow +
cushionlike +
circular to linear +
0.9 cm9 mm <br />0.009 m <br /> (1 cm10 mm <br />0.01 m <br />) +
deciduous +  and persistent +
connected +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
hourglass--shaped +
0.003 cm0.03 mm <br />3.0e-5 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
Allan D. Zimmerman +  and Bruce D. Parfitt +
A. Berger +
spineless +  and naked +
hardened +
Escobaria runyonii +
triangular +
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 +
with mucilage +  and mucilaginous +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Tex. +, Mexico (Coahuila) +, Mexico (Nuevo León) +  and Mexico (Tamaulipas) +
microscopic +
50-400 m +
not separating +
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 />) +
10mm;19mm +
indehiscent +
persistent +, long +  and deciduous +
11mm;20mm +
obovoid +, cylindric +  and ellipsoid +
succulent +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Dense scrub, often with Leucophyllum, Agave lechuguilla, Echinocereus poselgeri, or Lophophora, limestone, gravel, or silt substrates +
porrect +, descending +  and ascending +
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 +
purplish-pink +, brownish green +, brown +  and pinkish +
fringed +  and toothed +
small +
not mucilaginous +
stamen-bearing +
deciduous +  and persistent +
Flowering Feb–Mar +  and fruiting 2-3 months after flowering. +
mucilaginous +
ridgelike +  and nipple--shaped +
cream +  and white +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
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 +
spheric +
adventitious +
gray +  and snowy white +
curved +  and straight +
semideciduous +
descend +, projecting +  and appressed +
1 (?) +  and 4 (?) +
hairlike +
hard +  and rigid +
differentiated +
decurrent +
unsegmented +
3cm;6cm +
tuberculate +
ovoid +  and cylindric +
succulent +
1.5cm;3cm +
dark green +  and bright-yellow +
protruding +  and flat +
large +  and small +
tuberculate +
Coryphantha emskoetteriana +  and Coryphantha muehlbaueriana +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Coryphantha robertii +
Coryphantha +
species +
dull +  and glossy +
pitted +  and raised-reticulate +
4mm +  and 8mm +
conic +  and hemispheric or cylindric +
3mm +  and 5mm +
epiphytic;epiphytic;epiphytic +