Xerophyte

Central Spines

1-2(rarely more), subulate to awl shaped, rigid, upright, stiff, 1-2 two times longer than radials (approx 12 mm long) at fist brown, brownish-red or yellow, becoming ivory-brown.

Seeds

Minute brown.

Description

Mammillaria voburnensisSN|20736]]SN|25920]] (Sometimes wrongly spelled “woburnensis”), is a freely clustering cactus with yellow 'snowy' tomentum near the top. This species forms mounds up to 30 centimetres high and wide. It was firstly described in 1845 by Frederick Scheer.

Similar Species

Mammillaria voburnensisSN|25920]]SN|25920]] is strictly related with Mammillaria karwinskianaSN|25920]]SN|20736]] and often synonymized with the latter.

Habitat

Solitary or growing in large clumps of 25 or more, but loosely held together up to 30 cm high and wide, giving off new plants from all parts of the body.

Tubercles

Small, sub-ovoidal, wider at base, face polyhedral above, rounded below, dull green often reddish toward the top, with latex. Axills densely filled with silky wool and bristles. Tubercle arranged in 8-13 spirals.

Flowers

Yellowish with a reddish tinge, small, about 1 cm long..

Stem

Globose to cylindrical, apex convex, 5-15 cm high and about 3 cm in diameter (often larger in cultivation), yellowish green to dull green with a reddish tinge, oozing abundant milky sap if enjured.

Radial Spines

5-9 (approx 4 mm long) sub-equal, irregularly spreading, more or less recurved, lower 4 slightly longer, yellowish or ivory white pointing downwards. All yellowish or ivory white.

Fruits

Club shaped red18 to 25 mm long.

Areoles

Woolly becoming soon bare as they ages.