Mammillaria lauif. dasyacantha D. R. Hunt 1979; M. dasyacantha
(D. R. Hunt) Reppenhagen 1990, not validly published; M. laui subsp. dasyacantha (D. R. Hunt) D. R. Hunt 1997 Mammillaria lauif. subducta D. R. Hunt 1979, M. subducta (D. R. Hunt)
Reppenhagen 1987, M. laui subsp .subducta (D. R. Hunt) D. R.
Plants forming clusters. Stems depressed globose to globose or short oblong, to 6 cm (2.4 in) high and 4.5 cm (1.8 in) in diameter, densely covered by spines. Tubercles cylindrical, axils naked or with sparse wool. Central spines absent or many, intergrading with the radials. Radial spines 35-60 or more, in several series, hairlike, white, 6-9 mm (0.2-0.4 in) long. Flowers carmine, to 15 mm (0.6 in) long and 12 mm (0.5 in) in diameter. Fruits cylindrical to club shaped, white or pale pink, to 10 mm (0.4 in) long. Distribution: Tamauli-pas, Mexico.
Three subspecies of Mammillaria laui are recognized. Subspecies laui lacks distinct central spines but the radials are stiff; it occurs at moderate elevations between Ciudad Victoria and Jaumave. Subspecies dasyacantha has numerous, very slender central spines, all spines soft and flexible; it occurs at much higher elevations. Subspecies subducta has as many as 12 distinct, somewhat stout, white to yellowish central spines 7-10 mm (0.3-0.4 in) long; it occurs at lower elevations.
Mammillaria lenta K. Brandegee 1904 Chilita lenta (K. Brandegee) Orcutt 1926
Plants branching basally to form flat-topped clusters. Stems globose to flattened globose, bright green to yellow-green, 3-5 cm (1.2-2 in) in diameter, 1-2 cm (0.4-0.8 in) high. Tubercles slender conical, somewhat firm, without latex, axils with short, persistent wool and some bristles. Central spines absent. Radial spines 30-40, dense, fine, white to slightly yellow, 3-7 mm (to 0.3 in) long. Flowers white with pink or purplish midveins, to 20 mm (0.8 in) long and 25 mm (1 in)
Mammillaria longiflora 427
in diameter. Fruits club shaped, red, to 10 mm (0.4 in) long. Seeds black. Distribution: Coahila, Mexico.
Mammillaria limonensis Reppenhagen 1985 Mammillaria fittkauisubsp. limonensis (Reppenhagen) J. M. Liithy 1995
Plants branching basally to form decumbent clumps. Stems globose to short cylindrical, gray-green, 4-12 cm (1.6-4.7 in) high, 3-5 cm (1.2-2 in) in diameter. Tubercles slightly tapered cylindrical, stubby, flattened apically; without latex, axils with as many as 14 bristles to 15 mm (0.6 in) long. Central spines 5-8, brown to blackish, with yellowish bases, 9-18 mm (0.4-0.7 in) long, lower one hooked. Radial spines 15-20, straight, white, to 6 mm (0.2 in) long. Flowers short funnelform, pink, to 12 mm (0.5 in) in diameter. Fruits club shaped, shiny scarlet red, 8-20 mm (0.3-0.8 in) long. Seeds brownish black, coarsely pitted. Distribution: Jalisco, Mexico.
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