Rebutia (Aylostera) vulpina was first published in the Dutch journal Succulenta 56(3): p.p. 66 by Friedrich Ritter in 1977.

The original description in Latin is given here, together with my own English translation.

Rebutia vulpina Ritter spec. nov.

Proliferans, 3-5 cm crassa, viridis; costae ca. 20, dissolutae tuberculis 1,5-2 mm altis; areolae suborbiculares, 1-1,5 mm longae, lana alba obtectae, 2-3 mm inter se remotae; spinae asperae; marginales 10-14, paulum externe directae, tenuiores albae, ceterae rufae, 3-15 mm longae; centrales 1-7, rufae; flores 25-30 mm longi; ovarium lana alba et saetis instructum; stylus 5-6 mm cum tubo coalitus; sulcus nectarifer 0,5-1 mm longus; tubus floralis 3 mm longus, nudus; filamenta alba, sine lacuna insertionum; stylus albidus, stigmata 3-4 flavida; petala miniata terminis coccineis, 16-20 mm longa, 5-7 mm lata, linearia, obtusa.

Semina atra, 1,2 mm longa, subtiliter tuberculata.

Habitat Tarija ad occidentem versus, Prov. Mendez, Bolivia.

Nr. collect. FR 939.

English translation

Rebutia vulpina Ritter spec. nov.

Proliferating, 3-5cm thick, green; approx. 20 ribs, divided by 1.5 – 2mm high tubercles; areoles almost circular, 1 – 1.5mm long, covered with white wool, 2-3mm apart; spines rough; 10-14 marginal spines, projecting a little, the thinner ones white, the rest brownish-red, 3 -15mm long; 1-7 central spines, brownish red; flowers 25-30 mm long; ovary with white wool and bristles; style fused with the flower tube for 5 – 6mm; nectar groove 0.5 – 1mm long; flower tube 3mm long, naked; stamens white, inserted very close together; style whitish, 3 – 4 buff stigmas; petals dark red with scarlet tips, 16 – 20mm long, 5 – 7mm broad, linear, blunt.

Seeds black, 1.2mm long, finely knobby.

Habitat W. of Tarija, Prov. Mendez, Bolivia. Field number FR 939.