Mammillaria thornberi Orcutt 1902



Chilita thornberi (Orcutt) Orcutt 1926

Mammillaria fasciculata Britton & Rose 1923, misapplied, not Engelmann ex B. D. Jackson 1895 (see Echinocereus fasciculatus); Ebnerella fasciculata (Britton & Rose) Buxbaum 1951, Chilita fasciculata (Britton & Rose) Buxbaum 1954 Mammillaria yaquensis R. T. Craig 1945, Ebnerella yaquensis (R. T. Craig) Buxbaum 1951, Chilita yaquensis (R. T. Craig) Buxbaum 1954, M. thornberi subsp.yaquensis (R. T. Craig) D. R. Hunt 1997

Plants commonly forming dense clusters. Stems slender cylindrical, tapered basally, often dull purplish green, 5-10 cm (2-3.9 in) high, 1-2.5 cm (0.4-1 in) in diameter. Tubercles slightly flabby, conical to cylindrical, without latex, axils naked. Central spine one, hooked, pale to dark reddish brown, 9-18 mm (0.4-0.7 in) long. Radial spines 15-20, white or yellowish, with dark tips, 5-9 mm (0.2-0.4 in) long. Flowers broadly funnelform, purplish to lavender pink, 15-20 mm (0.6-0.8 in) wide. Fruits prominent, fat, red. Seeds black. Distribution: Arizona, and Sonora, Mexico.

Two subspecies of Mammillaria thornberi are recognized. Subspecies thornberi has stems to 2.5 cm (1 in) in diameter that taper basally, and 15-20 radial spines that are not distinctly pubescent; it occurs in Arizona and Sonora. Subspecies yaquensis has fragile stems to 1.5 cm (0.6 in) in diameter and 7 cm (2.8 in) long, and 18-19 minutely pubescent radial spines; it occurs only in Sonora.

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