Species of cactus
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Mammillaria albiflora is a critically endangered species of cactus.
The botanist David Hunt initially considered it "probably just a phase" of "Mammillaria herrerae". Other students of the "Mammillaria" genus disagreed, including Charlie Glass, and Hunt eventually accepted it as a distinct species. "M. albiflora" is more slender than "M. herrerae", with typically solitary stems about 2 cm wide and at least 5 cm tall. It has fewer radial spines (60–80, compared to 100+ in "M. herrerae") but larger flowers, up to 3.5 cm long, white with a faint pinkish hue under good light. The fruit hides beneath the spines but remains external to the plant body, similar to "M. herrerae". The seeds are black and require careful handling to locate.
"Mammillaria albiflora" is native to the Mexican state of Guanajuato, found south of Pozos at altitudes between , including along the road to San José Iturbide and at La Calera—locations roughly 50 km or more from the range of "M. herrerae". It grows on sloping calcareous rock in semi-desert. Because it occurs in only one location with a limited range and its population is continuously declining, it is listed as Critically Endangered by the International Union for Conservation of Nature (IUCN). The chief threat to its survival is illegal plant collecting by both amateurs and commercial collectors. A part of the location was fenced off in an attempt to protect it, but the fence was soon breached. The population fell from about 10,000 to about 5,000 individuals from 1993 to 2013.
"Mammillaria albiflora" is illegally collected or commercially cultivated to be grown as an ornamental plant. It is propagated worldwide and may be found in international trade. It is challenging to cultivate, apparently resenting peat and acidic humus in potting mix. A mixture containing some limestone is likely beneficial. Successful growth also requires maximum sun exposure, which is crucial for flowering.
References.
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