Leaves: Rudimentary, forming the tubercle tooth stipular denticles absent. Tubercles 5-20 mm long, conical, spreading, fused near base into the irregularly arranged angles, glabrous, light green, faintly glaucous, armed with stout, yellowish, hard-pointed acute spines 6-12 mm long, with the apical half of the spines brown. Branches, erect, glabrous, green, sometimes mottled with purple-brown, 15–50 cm tall and 18–36 cm thick, very variable, short and very compact, sometimes with robust tubercles, or slender-stemmed, irregularly or spirally 4–6-angled. Stems: Branching from a single, central stem, erect from base. The inner lobes are shortly erect, incumbent on the anthers, and exceed them.The odour of the flowers is extremely disagreeable.ĭerivation of specific name: The name refers to the stout tubercles with brown apices (From Lat. The corona is stipitate (held on a stalk), dark purple-brown, The outer lobes are erect, bifid, fused to the bases of the inner lobes that form pouches. The corolla is 20-27 mm across, the tube is yellow and purple-spotted.
Bunches of 3-15 velvety purple-brown flowers appears in autumn in the upper 2/3 of the stem, and open simultaneously, but are seldom seen in culture. The leaves are transmuted into hard thorns.
Description: Quaqua mammillaris is a much-branched, robust succulent shrub, up to 50 cm high, and 50-70 cm across, branched in a bushy manner which root from the primary stem only.
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