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Herbaceum 30-35 cm altus. Tubera diluto brunea, 2-3 cm longa. Stolonis 7-15 cm long. 1-1.5 mm crassus. Caulis laxo erectus, ramosus, alatus, viridis purpureo punctis. Folia 7-20 cm long. 6-12 cm lata, 4-5 juga. Foliola lateralia opposita vel alternata 4-6 x 2.53 cm elliptica vel ovata a basim obliqua asyrnetrica, brevi petiolulata vel sessilia. Foliolum terminale ellipticum 6 x 4 cm, apice acuto vel rotundato. Foliola interjugalia 8-10, orbicularia 5-10 mm long. Omnibus foliolis, pilis brevis sparsis praeditus. Pedunculus communis 3-7 cm long. atro purpureo marmoratus, pilis sparsis vel ad furcae densioribus, hyalinis, brevis instructus. Floribus 7-10. Pedicelli 10-12 mm long. purpureo marmoratis sparsi pilosis, dimidio articulatis. Calyx 5-6 mm long a basim atro viridis denso pubescentis. Lobi sepalis 2 mm long. lineari acutis. Corolla rotacea 15-20 mm diam. interiora diluto lilacina, exteriora obscuriora, extus denso pubescentia. Lobi petalis 3 mm long. 4 mm latis. Staminibus 5-7 mm long., filamentibus 1.5 mm long. antheris aurantiacus. Ovario globoso a basim atro viridis, 2.5 mm long. Stylo 8 mm long. stamina superans a basim albidis. Stigma claviformis 1.5 mm long. viridis. Bacca globosa vel subconica 1.5-2 cm long. dilutissime viridis vel albidis. Patria: Bolivia, provincia Cercado, departamento Cochabamba, prope "Las Cuadras" 2.567 m. Herbaceous tuberiferous 30-35 cm tall. Tubers 2-3 cm long round or elongate or flattened light brown much lenticellate. Stolons 7-15 cm long, 1-1.5 mm thick. Stems laxly erect, branched, winged, green slightly purple spotted. Leaves 10-12 per plant 7-20 cm long, 6-12 cm wide, 4-5 jugate. Leaflets dark green somewhat rough. Lateral leaflets alternate or opposite, roundish and asymmetric at base. Terminal leaflet elliptic acute or rather roundish at tip. Intersected leaflets 4-5 pair, orbicular 5-10 mm. long. All leaflets with scattered short whitish hairs. Common peduncles 3-7 cm. long with scattered short hyaline hairs. Flowers about 8 per inflorescence. Peduncles green, dark purple spotted much pubescent at furcae branches. Pedicels 10-12 mm. long purple marbled bearing scattered hairs, with the articulation at its middle length. Articulation purple tinged. Calyx 5-6 mm long, densely tomentose dark green at its base. Sepal acumens 2 mm long, linearly acute. Corolla rotate 15-20 mm diameter, light lilac inside, darker outside, more hairy outside. Petal acumens 3 mm long, 4 mm wide. Androecium cone 5-7 mm long; filaments 1.5 mm long; anthers orange yellow. Ovary globosely dark green at base 2.5 mm long. Style 8 mm long surpassing anthers, whitish at its base. Stigma clavate 1.5 mm long, green. Berries globose to subtonic 1.5-2 cm long very light green almost whitish. Bolivia. Cercado. Cochabamba, February 1966, M. Cárdenas, NQ 6,229 (Type in Herbarium Cardenasianum). Obs. This is a weed potato which grows at the University cultivated grounds among maize and other crops. It might suggest some forms of S. sparsipilum or S. anomalocalyx, but differs by its roundish and harsh leaflets and shape of berries. It is remarkable the resistance of this wild potato to various diseases and particularly to the dominant virus in these fields. Thus this potato thrives year after year since immemorial time not showing symptoms of disease. This species, it is named after Eng. Agr. Alberto Ruiz Zeballos a former potato breeder at the University experimental fields and who has cooperate in wild potato collecting activities in this country. Cochabamba, March, 1966.
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