Mammillaria dioica
First description by K. Brandegee, Erythea 5: 115 (1897)
Body: Plants solitary to clustering, sometimes branching. Stems cylindrical, blue-green, rounded apically, 10 - 25 cm and up to 33 cm (13 in) high, 3 - 7 cm (1.2 - 2.8 in) in diameter.
Roots:
Sap: Without latex.
Tubercule arrangement:
Tubercule: Tubercules firm, short cylindrical.
Axil: With wool and 4 - 15 bristles as long as the tubercules.
Radial spine: 11 - 22, needle-like, straight, white, 5 - 7 mm (0.2 - 0.3 in) long.
Central spine: 1 - 4, sometimes absent, brown to brownish-black, needle-like, erect, stout, lowermost one hooked, upper ones straight, ascending, like the radials, 8 - 15 mm (0.3 - 0.6 in) long.
Flower: Funnelform, imperfectly unisexual, occuring on functionally dioecious plants, white to yellowish white, sometimes with red midstripe, 10 - 30 mm (0.4 - 1.2 in) long.
Fruit: Club shaped or ovoid, scarlet.
Seed: Black.
Flowering period in Cultivation (Europe):
Minimum temperature:
Habitat Substrate:
Geographic Distribution: California, USA and Baja California Peninsula and Sonora, Mexico.
Comments: Difficult, requiring the very best drainage.
Bibliography:
John Pilbeam (1999) - Mammillaria The Cactus File Handbook - page 88.
Edward F. Anderson (2001) - The Cactus Family - page 415.
Synonymes:
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Photos containing "dioica" in caption, comment or name.
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