Mammillaria (bartshella) shumannii
 

Description: Small  clumping plants.
Stems: Soft, blue-green or grey-green epidermis that tinge in pink in bright sun up to 5cm wide, globose to depressed conical when growing in habitat. While cultivated plant have (frequently) oblong offsetting stems.
Tubercles: Prominent rounded tubercles usually depressed
Flowers:  Large 3-4cm in diameter, purplish pink, in summer, with long narrow spreading stigmata, showy, nearly as large as the plant bodies.

Cultivation: This plant is somewhat difficult to cultivate. Needs good drainage as it is rot prone.

Origin: Baja California Sur, Mexico

Conservation status: Listed in CITES appendix 2.

M. shumannii was once placed in the segregate genus Bartschella because of its fruit anatomy and large pink flowers located at the top of the plant. The fruit are red, thin-skinned  and often break off from a basal pore rather than falling whole (like in most Mammillaria).

• Bartschella schumannii
• Mammillaria venusta

The flowers are very showy and nearly as large as the plant bodies.