Mammillaria wrightii

Engelmann

Proc. Amer. Acad. Arts 3: 262. 1856.

Treatment appears in FNA Volume 4. Treatment on page 250. Mentioned on page 236, 248.

Plants usually unbranched. Roots: upper portion of primary-root somewhat thickened and succulent proximally, otherwise fibrous. Stems flat-topped or spheric, 4–8 × 4–8 cm, ± flaccid; tubercles 6–24 mm; axils appearing naked; cortex and pith mucilaginous; latex absent. Spines 9–31 (–34) per areole, white, usually tipped brown; radial spines 8–30 per areole, in 1 series, glabrous (puberulent in first-year flowering plants); lateral spines bristlelike, 7–11 mm, stiff, longest and thickest of spines; adaxial spines often darker; central spines 1–4 (–7) per areole, porrect or strongly projecting, 1 or all hooked, (5–) 12–14 (–21) mm; subcentral spines 0. Flowers 2.5–3.5 (–5.2) × 2.2–4.5 (–7.5) cm; outer tepal margins conspicuously fringed; inner tepals rose-pink or magenta [white], margins often paler; stigma lobes yellow or pale green (rarely reddish). Fruits green or dull purple, spheric to ovoid or obovoid, (9–) 13–20 (–28) × (6–) 7–1.9 (–26) mm, juicy throughout; floral remnant persistent. Seeds black, 1.3–1.5 mm, pitted; testa hard, anticlinal cell-walls straight (not undulate); interstices conspicuously narrower than pit diameters; pits bowl-shaped. 2n = 22.

Discussion

Varieties 3 (2 in the flora).

Key

1 Radial spines usually 8-15 per areole; fruits 12.5-26 mm diam Mammillaria wrightii var. wrightii
1 Radial spines usually 16-30 per areole; fruits 6-15 mm diam Mammillaria wrightii var. wilcoxii
... more about "Mammillaria wrightii"
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 +
1.4 cm14 mm <br />0.014 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
curved +  and straight +
projecting +  and porrect +
all +, 1 +  and 4 +
1.2 cm12 mm <br />0.012 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
proliferating +
flattened +  and cylindric +
mucilaginous +
Ariz. +, N.Mex. +, Tex. +  and Mexico +
not separating +
3.5 cm35 mm <br />0.035 m <br /> (5.2 cm52 mm <br />0.052 m <br />) +
4.5 cm45 mm <br />0.045 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
unconnected +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 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 />) +
2.2cm;4.5cm +
2 cm20 mm <br />0.02 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
0.19 cm1.9 mm <br />0.0019 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
purple;dull;green +
indehiscent +
persistent +, long +  and deciduous +
13mm;20mm +
spheric +  and ovoid or obovoid +
0.7 cm7 mm <br />0.007 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1.5mm;8.5mm +
conspicuously narrower +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 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 +
deciduous +  and persistent +
bowl--shaped +
mucilaginous +
ridgelike +  and nipple--shaped +
Proc. Amer. Acad. Arts +
zimmerman1977a +
bristly +  and woolly +
3;2;2;30 +
triangular +
arillate +  and strophiolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
obovoid;pyriform;obovoid;pyriform;lenticular-reniform;comma--shaped;spheric +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
tipped brown +  and white +
straight +  and curved +
deciduous +  and persistent +
8 (?) +  and 30 (?) +
annulate-ridged +, hairlike +, daggerlike +, subulate +  and acicular +
0.3 cm3 mm <br />0.003 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
hard +  and rigid +
decurrent +
unsegmented +
12 cm120 mm <br />0.12 m <br /> (20 cm200 mm <br />0.2 m <br />) +
purplish +, green +  and gray-green +
4cm;8cm +
spheric +  and flat-topped +
4cm;8cm +
pale green +  and yellow +
tuberculate +
Chilita +, Cochemiea +, Dolichothele +, Ebnerella +, Leptocladodia +, Neomammillaria +  and Phellosperma +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Mammillaria wrightii +
Mammillaria +
species +
flat +  and concave +
dull +  and glossy +
not confluent +
3mm +  and 25mm +
cylindric +, conic +  and pyramidal +
0.6 cm6 mm <br />0.006 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
2mm +  and 9mm +
fibrous +  and succulent +
straight +
sinuate +
epiphytic;epiphytic;epiphytic +
barrel-shaped +  and spheric +