S.M. Bukasov. Potatoes of South America and their breeding use, Leningrad, 1933, p. 71.

Diagnosis: Powerful plants, decumbent stems, with numerous axillary branches. Leaf is strongly dissected, leaflets are large. Corolla is dark-blue, large. Stigma is bipartite. Does not form berries.
Similarity with f. incrassatum: large inflorescence, size of peduncle and pedicles,  thick upper part of pedicle, density of pubescence (but longer), calyx, corolla and shape of lobe, anthers.
Similarities with v. bolivianum: length of the upper part of pedicle and conic anthers column (more oval by incrassatum).
Differences from v. bolivianum and incrassatum: strongly dissected leaf, conic shape of the grown-up bud, blue corolla color, strongly displaced chinked conic anthers column, bipartite stigma, absence of berries.
Very far from v. chiar-imilla, strongly different in flower and dissection of corolla.
Juz. 1783. La Paz under the name Cjati (wrong name, usually referring to another species - S. stenotomum).