Mammillaria senilis Salm Dyck 1850

Cochemiea senilis (Salm-Dyck) Orcutt 1922, Mamillopsis senilis

(Salm-Dyck) Britton & Rose 1923 Mammillaria senilis var. diguetii F. A. C. Weber 1904, Mamillopsis diguetii (F. A. C. Weber) Britton & Rose 1923, Mammillaria diguetii (F. A. C. Weber) D. R. Hunt 1971

Plants forming clusters. Stems globose to cylindrical, to 15 cm (5.9 in) high and 10 cm (3.9 in) in diameter. Tubercles conical, obtuse, without latex, axils with wool and bristles. Central spines 4-6, white with yellow tips, upper and lower ones hooked. Radial spines 30-40, thinner than the centrals, white, to 20 mm (0.8 in) long. Flowers orange-red, 60-70 mm (2.4-2.8 in) long, 55-60 mm (2.2-2.4 in) in diameter; floral tubes slender, scaly, to 4 cm (1.6 in) long. Fruits silvery red to greenish white. Seeds black. Distribution: Chihuahua, Jalisco, and Sinaloa, Mexico. Mammillaria senilis has been used ceremonially by the Tarahumara (Chapter 2, under Cacti as Medicine). This species is probably closely related to Cochemiea.

Mammillaria sheldonii (Britton & Rose) Boedeker 1933 SHELDON'S PINCUSHION

Neomammillaria sheldonii Britton & Rose 1923, Chilita sheldonii (Britton & Rose) Orcutt 1926, Ebnerella sheldonii (Britton & Rose) Bux-baum 1951

Neomammillaria swinglei Britton & Rose 1923, Chilita swinglei (Britton & Rose) Orcutt 1926, Mammillaria swinglei {Britton & Rose) Boedeker 1933, Ebnerella swinglei (Britton & Rose) Buxbaum 1951 Mammillaria gueldemanniana Backeberg 1941, Chilita gueldemanni-

ana (Backeberg) Buxbaum 1954 Mammillaria alamensis R. T. Craig 1945, Chilita alamensis (R. T. Craig) Buxbaum 1954

Mammillaria guirocobensis R.T. Craig 1945, Ebnerella guirocobensis

(R.T.Craig) Buxbaum 1951 Mammillaria inaiae R. T. Craig 1945, Ebnerella inaiae (R. T. Craig) Buxbaum 1951, Chilita inaiae (R. T. Craig) Buxbaum 1954 Mammillaria marnieriana Backeberg 1952

Plants branching basally to form clumps. Stems slender cylindrical, dull green, often becoming reddish, 8-20 cm (3.1-7.9 in) high, to 6 cm (2.4 in) in diameter. Tubercles cylindrical, four-sided basally, keeled, without latex, axils without wool but sometimes with a few bristles. Central spines 1-4, stout, to 15 mm (0.6 in) long, lower one elongated and either straight or hooked. Radial spines 9-24 with 1-2 placed sub-centrally, white with dark tips, 6-8 mm (0.2-0.3 in) long. Flowers often open several days, wide funnelform, light purplish pink with pale margins to nearly white, to 20 mm (0.8 in) long and in diameter. Fruits club shaped, pale scarlet, 25-30 mm (1-1.2 in) long. Seeds black. Distribution: Chihuahua and Sonora, Mexico.

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