Mammillaria lasiacantha

Engelmann

Proc. Amer. Acad. Arts 3: 261. 1856.

Common names: Golf ball cactus lacespine nipple cactus
Illustrated
Synonyms: Mammillaria lasiacantha var. denudata Engelmann
Treatment appears in FNA Volume 4. Mentioned on page 252.

Plants unbranched, usually deep-seated in substrate and inconspicuous. Roots diffuse, upper portion not enlarged. Stems depressed-spheric to short cylindric, (1–) 2–3.5 × (1.4–) 2–4 (–7) cm, firm; tubercles 3–6 (–8) × 2–3 mm; axils without evident hairs; cortex and pith not mucilaginous; latex clear or slightly milky, sporadic, only in outer cortex. Spines (26–) 40–60 (–90) per areole, in several series but all equally thin, mostly appressed, white or very pale-pink, often minutely tipped pinkish brown, innocuous, bristlelike, 0.6–5 (–6) × 0.05–0.1 mm, glabrous to plumose, all interpreted as radial, innermost spines shortest; central spines 0. Flowers 0.9–1.5 (–2) × 0.8–1.3 (–1.8) cm; outermost tepal margins entire (or minutely and irregularly lacerate); inner tepals white or cream, usually with sharply defined midstripes of green, yellow, tan, pink, pale-purple, or reddish, 4.5–8 × 1.5–2.7 mm; stigma lobes yellow or pale yellow-green to green, 0.3–1 mm. Fruits scarlet, cylindric or clavate, 10–20 (–25) × (3–) 4–8 (–11) mm, juicy mostly in fruit walls; floral remnant persistent. Seeds black, 1–1.2 [–1.4] × 0.8 [–1.1] × 0.8 mm, pitted; testa hard; interstices equaling pit diameters; pits bowl-shaped. 2n = 22.


Phenology: Flowering [Jan-]Feb–Mar; fruiting Jun–Aug.
Habitat: Chihuahuan desert scrub with Agave lechuguilla, rocky hills, gravelly slopes, usually on limestone
Elevation: 500-1800(-2100) m

Distribution

V4 466-distribution-map.gif

N.Mex., Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (Nuevo León), Mexico (San Luis Potosí), Mexico (Sonora), Mexico (Zacatecas)

Discussion

Adults of Mammillaria lasiacantha usually have glabrous spines, but in some populations all plants may retain plumose spines at maturity. Epithelantha species and immature plants of Coryphantha vivipara var. neomexicana often are misidentified as adults of M. lasiacantha, especially from El Paso, Texas, westward (where M. lasiacantha is rare). Mammillaria lasiacantha is remarkable for its disjunction to one site in Sonora, Mexico, far to the west of its usual range.

Selected References

None.

Lower Taxa

None.
... more about "Mammillaria lasiacantha"
cushionlike +
needlelike +  and bristlelike +
circular to linear +
2.5 cm25 mm <br />0.025 m <br /> (3.1 cm31 mm <br />0.031 m <br />) +
deciduous +  and persistent +
0.2 cm2 mm <br />0.002 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
plumose +  and hairlike +
0.001 cm0.01 mm <br />1.0e-5 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Allan D. Zimmerman +  and Bruce D. Parfitt +
Engelmann +
hardened +
triangular +
curved +  and straight +
0 +  and several +
terete +  and hooked +
proliferating +
flattened +  and cylindric +
Golf ball cactus +  and lacespine nipple cactus +
not mucilaginous +
N.Mex. +, Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +, Mexico (Nuevo León) +, Mexico (San Luis Potosí) +, Mexico (Sonora) +  and Mexico (Zacatecas) +
500-1800(-2100) m +
not separating +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
unconnected +
0.9 cm9 mm <br />0.009 m <br /> (1.5 cm15 mm <br />0.015 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 />) +
0.8cm;1.3cm +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
indehiscent +
persistent +, long +  and deciduous +
10mm;20mm +
clavate +  and cylindric +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Chihuahuan desert scrub with Agave lechuguilla, rocky hills, gravelly slopes, usually on limestone +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1.5mm;2.7mm +
milky +  and clear +
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 +
deciduous +  and persistent +
Flowering [Jan-]Feb–Mar +  and fruiting Jun–Aug. +
bowl--shaped +
not mucilaginous +
ridgelike +  and nipple--shaped +
Proc. Amer. Acad. Arts +
bristly +  and woolly +
3;2;2;30 +
triangular +
arillate +  and strophiolate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
obovoid;pyriform;obovoid;pyriform;lenticular-reniform;comma--shaped;spheric +
0.8 cm8 mm <br />0.008 m <br /> (?) +
Illustrated +
cluster +  and radial +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
brown +, tipped pinkish +, pale-pink +  and white +
straight +  and curved +
deciduous +  and persistent +
0.6mm +  and 5mm +
40 (?) +  and 60 (?) +
plumose +
0.3 cm3 mm <br />0.003 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
hard +  and rigid +
innocuous +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
decurrent +
unsegmented +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
purplish +, green +  and gray-green +
2cm;3.5cm +
depressed-spheric +  and short cylindric +
2cm;4cm +
pale yellow-green +  and green +
tuberculate +
Mammillaria lasiacantha var. denudata +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Mammillaria lasiacantha +
Mammillaria +
species +
fringed +  and entire +
flat +  and concave +
dull +  and glossy +
not confluent +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
3mm +  and 6mm +
cylindric +, conic +  and pyramidal +
2mm +  and 3mm +
not enlarged +
straight +
sinuate +
epiphytic;epiphytic;epiphytic +
barrel-shaped +  and spheric +