Origin and Habitat: Sonora, Mexico.
Altitude: 0-300 metres above sea level.
Habitat and Ecology: Mammillaria boolii is locally common, sometimes abundant in rocky soils, across coastal mountains in thin forests together with Echinocereus scopulorum, Echinocereus engelmannii, Mammillaria swinglei and Ferocatus emoryi. Some parts of its habitat has been destroyed for urban development.
Common Names include: RUSSIAN (Русский): Маммиллярия Бола; UKRAINIAN (Українська): Мамілярія Буля

Source: Encyclopedia of Cacti

Red List Category: Near Threatened ver 3.1
Justification: This species is listed as Near Threatened due to small range size and significant ongoing populations decline, which are close to but do not currently qualify for a threat category. Although there is no substantial decline, ff current trends continue this species could become Vulnerable (B criteria) in the future based on range size and decline.

Source: ICN Red List of Threatened Species