Mammillarias.net

Mammillaria deherdtiana ssp deherdtiana

First description by Farwig, Cact. Succ. J. (US) 41(1): 28 (1969)

Body: Solitary in habitat but clustering from the base in cultivation. Stems to 2.5 cm (1 in) in high and about 5 cm in diameter.

Roots: fibrous.

Sap: sans latex.

Tubercule arrangement: 8-13

Tubercule: Conical.

Axil: Slightly woolly or naked.

Radial spine: 33 - 36, fine, needle-like, slightly curved 3 to 6 mm long, yellow becoming white.

Central spine: 1 - 6 or more, but they appear with age so they are often viewed without any one, sometimes absent, 3 to 7 mm long, fine, needle-like, nearly erect, reddish brown to yellow.

Flower: Long funnelform, bright rose violet to 5 cm in diameter, with a 2 cm long flower tube very distinct. Stigmas are white.

Fruit: Globose with 3 to 4 mm diameter, coulour is pale-green, half embedded in stems.

Seed: Dark brown to black.

Flowering period in Cultivation (Europe): March, April.

Minimum temperature:

Habitat Substrate: barren rocky soil

Geographic Distribution: Oaxacana, Mexico.

Comments: In culture, organic substrate.
Slow growing species that will form irregular clumps with time. Be sure to limit water and fertilizers more than with faster growers. Spine formation is enhanced by bright light. Considered more difficult than the average Mammillaria species.

Bibliography:
John Pilbeam (1999) - Mammillaria The Cactus File Handbook - page 84.
Edward F. Anderson (2001) - The Cactus Family - page 414.

Synonymes: