Succulent forming broad spreading clump up to 0.5 m diam. or more, often rooting freely near bases of side-branches. Stems 50-200 mm long, 20-30 mm thick, decumbent, bluish green often mottled with purple to purplish mottled with darker purple; tubercles 4-15 mm long, conical to laterally flattened, spreading, somewhat irregularly joined into 4 or 5 angles along stems, each tipped with sharp hardened tooth. Inflorescences of 3-30 ± simultaneously opening flowers usually in upper half of stem; pedicel 2-5 mm long, 1.5 mm thick, spreading and holding flower facing horizontally; sepals 2-3 mm long, ovate to linear-lanceolate, acute. Corolla 15-18 mm long, tubular-campanulate, in bud usually distinctly oblong and widening from mouth of tube towards apex; outside shiny dark purple-black to purple-red on lobes changing to white blotched with purple-black on tube; inside uniformly purple-black to purple-red on lobes becoming blotched on yellow background in lower half of lobes or around mouth of tube, white or pale yellow with few dark dots in tube, with conical obtuse white to dark purple papillae around mouth of tube and for some distance outwards along middle of lobe, papillae often aggregated into partially fused clusters and each tipped with an ascending bristle; tube 2.3-4.0 mm long, 3.0-3.3 mm broad at mouth, cupular, narrowing ± from middle towards somewhat thickened mouth; lobes 12-14 mm long, ±3 mm broad at base, erect to slightly spreading, usually constricted above base and then linear and parallel-sided or widening gradually to incurved ± deltoid-acute tip, longitudinally folded back except at tip and towards base so that upper surface distinctly keeled. Corona 2.7-3.0 mm tall, 2.5-2.7 mm broad, with purple lobes and cream to white base, raised on very short stipe; outer lobes 0.5-1.0 mm long, erect, bifid into ascending to erect deltoid to deltoid-lanceolate teeth, fused laterally with bases of inner lobes to form deep pouch; inner lobes 1-2 mm long, adpressed to backs of anthers and exceeding them, then connivent-erect and rising into column in centre, linear, obtuse, dorsiventrally flattened, with slightly spreading deltoid to truncate dorsal projection in series with outer lobes.
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Like Q. mammillaris but mat-forming and rooting on branches, stems 20-30 mm diam., with fewer teeth and sometimes mottled with purple, flowers in dense clusters of up to 30, with larger papillae around mouth of tube, lobes parallel-sided or widening slightly to incurved tips.