S. andigenum Juz. & Buk. f. caiceda Buk.

S.M. Bukasov. Potatoes of South America and their breeding use, Leningrad, 1933, p. 38

Diagnosis: Ņubers have a correct form, oval with small eyes, speckled, of a dark –violet color, uncolored parts are confined to eyes. Tuberization reacts negatively towards a long day, up to a total absence of tubers, like by the most other Columbian forma from Paramo, similarly to S. juzepczukii, the most high-altitude Bolivian species.
Stems are usually not strongly colored. Leaves are strongly dissected (different from tocanum) 6-pairs leaflets are on long petiolule, on which acroscopic and basiscopic primary leaflets are situated; there are many primary leaflets, up to 10-12 in a series; 3 pairs of primary leaflets, 1-2 pairs of secondary leaflets and 1-2 pairs are acroscopic, often of a bigger size. Leaflets are narrower than by tocanum.
Pedicles are rarely pubescent, 19-24 mm long below articulation, 6-8-10(11) mm long above articulation, the articulation is in the upper one-third of the pedicle, the articulation is not colored.
Calyx is 8-10 mm long, 8,5 mm from inside, 10 mm from outside, symmetric. Calyx is slightly trapeze form, 2,5 mm wide, with a membrane 3,5 mm. Acumens equal 1/3-1/2 of the calyx length, two of them are longer and wider, one is falcate, all are pressed to the bud and also to the berry.
Corolla is large, but to some extent smaller than by tocanum; length and width of a petal is about 16 mm, length of a lobe is less than by tocanum; acumen is about 4 mm long. Color is dark-violet with a black star. Corolla tube is about 2 mm.
Stamen filaments are 1,5-2 mm long, not thick (1020-1100 µ and more), colored. Anthers are 6-7 mm long, width of basis is 2,75-3 mm, apex 1,75-2 mm. Style is inclined, 500-550 µ thick, long, length is 10-11 mm, strongly overtopping the stamens (for 4 mm). Stigma is not big, slightly thicker than the style, sinus is not deep. Berries abundantly.
It is cultivated broadly in the whole Columbia and is the most wide-spread form, mainly in the regions adjacent to Central Cordillera of Columbia, where it is the main form, and on the tablelands Cundinamarca and Boyaca.
Dep. Boyaca, Clenaga near Tunja; dep. Cundinamarca in the Bogota area: Fontibon, Fagua, Chipaque, Facatativa, Dintel; dep. Tolima: Ibague; dep. Caldas: Termales; dep. Antioqula: Medellin, Santa Helena; dep. Cauca: Popayan.
Accessions ¹¹ 22, 24, 25, 26ą, 28ą, 34, 36d, 38ą, 41abc, 40c, 54d, 55d, 58, 60, 70ą, 71, 72ą, 78ą, 79, 80, 81ą, 82, 85ą, 86, 91, 92, 93, 95, 96, 100, 101, 102, 103, 104, 108, 109.
Indigenous names: Caiceda, Tuquerrena, Paramuna, Argentina.
The name Caiceda originates apparently from the settlement Caicedī in the dep. Antioquia, the name Tuquerrena from the town Tuquerres near Ecuadorean border, situated on a narrow altitude above sea level. This name, together with the other name used for this form, Paramuna, i.e.  “from Parama”, the coldest zone, shows that the described form is cultivated up to high altitudes (different from tocanum). The last synonymous name Argentina could point out that this form was brought from Argentina. These can be only mountain areas adjacent to Bolivia, as in the main agricultural areas of Argentina which situated narrower, mainly in the Atlantic part of the country, only breeding cultivars occasionally brought from Europe are cultivated. However, the absence of cultivars close to Caiceda in Bolivia and Peru which are situated on the way to Columbia, leads to the conclusion that this name has nothing in common with Argentina. The few Argentinean mountain accessions from Jujuy are also far from Caiceda.
Rarely the anthocyan form is cultivated, different from the type in strongly colored stem and colored articulation of the pedicle (accessions ¹¹ 54 c, 68 c, 73 ac).
By reproduction with seeds quite a variable segregation is present within the Columbian group variation.

The forms tocanum and v. hederiforme are not present in this progeny. Perhaps the white-flower form from Usme (¹77) segregates from Caiceda.