Mammillaria geminispina Haw.

국표에 없다.

Origin and Habitat: Guanajuato, Hidalgo, Querétaro, San Luis Potosí and possibly Veracruz. Mexico.
Altitude: 1000 - 1850 metres above sea level.
Habitat and Ecology: This species is found in xerophyllous scrub on calcareous soils on rocky hills, together with Cephalocereus senilisSN|6893]]SN|6893]], Gymnocactus horripilusSN|12124]]SN|12124]], Mammillaria schiedeanaSN|8885]]SN|2251]], Mammillaria wildiiSN|2251]]SN|8885]], Astrophytum ornatumSN|3660]]SN|3660]], Gymnocactus horripilusSN|12124]]SN|12124]], Selenicereus spinulosusSN|8698]]SN|8698]], Ferocactus glaucescensSN|1532]]SN|1532]], Cephalocereus senilisSN|6893]]SN|6893]], Stenocereus dumortieriSN|7942]]SN|7942]], Fouquieria purpusii, Brahea dulcisSN|24746]]SN|24746]], Echeveria coccineaSN|13290]]SN|13290]], Tillandsia grandis, Hechtia podanthaSN|19012]]SN|19012]], Agave strictaSN|208]]SN|568]] and Agave xylonacanthaSN|568]]SN|208]]. It forms colonies. In appropriate habitat the species is abundant. Historically the species was overcollected, however today this threat has been reduced.

Collapse...

Synonyms:

• Mammillaria geminispina Haw.

Common Names include:
ENGLISH: Whitey, Twin Spined Cactus, White Cactus
RUSSIAN (Русский): Маммиллярия парноколючковая
SPANISH (Español): Cabeza blanca
UKRAINIAN (Українська): Мамілярія гемініспіна, Мамілярія парноколючкова

Description: Mammillaria geminispinaSN|14012]]SN|14012]] is a highly variable densely spined species. Some cluster aggressively and form 30 to 90 cm large clumps that appear white, while other seem to stay more solitary.

Stem: Short cylindrical, light green whit latex, up to 18 cm high and 8 cm in diameter.
Tubercles: Rounded with latex. The axil is filled by white wool and 10 - 20 long white bristles.
Spines: Spines are variable too, some plants have very short while others have long spines.
Central spines: 2 (to 6) pure white or white with dark tip that protrude far out from the rest, straight or slightly curved, 0,5 to 4 cm long (or more).
Radial spines: 16 to 20 chalky white, interlacing up to 7 mm long.
Flowers: Campanulate, pinkish to carmine red, with darker midveins, to 20 mm long and in diameter usually in a ring in the growth of the previous year but sometime more randomly over the body. If grown from seed, M. geminispina can take seven to eight years before flowering.
Fruits: Red
Seeds: Brown.

Mammillaria geminispina (llifle.com)

https://youtu.be/iAYGFXJqFo4?t=184