Solanaceae Source

A global taxonomic resource for the nightshade family

Solanum cajamarcense

Citation author: 
Agronomía (Lima) 26(4): 314. 1959.
Peru. Cajamarca: Prov. Cajamarca, Lanchi, near Chiquidén, ascending from San Juan to El Paso del Gavilán, 2600 m, 17 May 1952, Ochoa 1490 (holotype, CUZ [Correll neg. 19, BM000881775, F-1604412, NY, UC1152208]; isotypes, CUZ [Correll neg. 20, BM000881775, F-1604414, NY, UC1152208], F-2190630 [F neg. 70879], GH, K-2 sheets, LL [Correll neg. 859, BM000881774, UC1152208]).
Last edited by: 
Spooner, D.M.
Written by: 
Spooner, D.M. & M. Ames
Herbs 0.25-0.94 m tall, erect. Stems 2-9 mm in diameter at base of plant, brown to yellow, sometimes winged, the wings 0-0.34 cm wide, densely pubescent with whitish hairs; tubers typically moniliform (multiple tubers arranged along the stolon like beads on a necklace).
Sympodial structure: 
Sympodial units tri- to plurifoliate, not geminate.
Leaves odd-pinnate, the blades 6.6-18 x 5.6-13.1 cm, dark green to yellowish, coriaceous, densely pubescent adaxially and abaxially with very short white hairs; lateral leaflet pairs 2-4, decreasing in size toward the leaf base, with the terminal leaflet subequal to or larger than the lateral leaflets; most distal lateral leaflets 2.7-6.9 x 1.4-3.5 cm, ovate to oblanceolate, the apex acute to acuminate, the base typically sessile and attenuate to rounded, asymmetric, with more tissue on the basiscopic side of leaflet; terminal leaflet 3.8-8.5 x 2-5.3 cm, ovate, the apex acute to acuminate, the base attenuate; interjected leaflets 0-38, sessile, ovate to orbicular; petioles 1-2 cm, densely pubescent with whitish simple hairs. Pseudostipules 0.4-5 mm long, densely pubescent as the stems.
Inflorescences 3.2-17.5 cm, terminal with a subtending axillary bud, generally in distal half of the plant, usually forked, with 10-60 flowers, with all flowers apparently perfect, the axes densely pubescent as the rest of the plant; peduncle 2.5-13.5 cm long; pedicels 16-54 mm long in flower and fruit, spaced 1-10 mm apart, articulated high in the distal half.
Flowers homostylous, 5-merous. Calyx 7-9 mm long, the tube 1-3 mm, the lobes 3-4 mm, linear, the acumens 1-2 mm long, densely pubescent as the stems. Corolla 2.6-4.8 cm in diameter, pentagonal to rotate, white, the tube 1-2 mm long, the acumens 0.5-1.2 mm long, the corolla edges flat, not folded dorsally, sub-glabrous adaxially with hairs on the margins of the petal acumens, pubescent abaxially. Stamens with the filaments 1-2 mm long; anthers 4-8 mm long, lanceolate, connivent, yellow, poricidal at the tips, the pores lengthening to slits with age. Ovary glabrous; style 6-13 mm x ca. 1 mm, exceeding stamens by 2-6 mm, straight, glabrous; stigma clavate to capitate.
Fruit a globose berry, 1.2-2.1 cm in diameter, light green, sometimes with purple stripes when ripe, glabrous.
Seeds from living specimens ovoid and ca. 2 mm long, whitish to greenish in fresh condition and drying brownish, with a thick covering of “hair-like” lateral walls of the testal cells that make the seeds mucilaginous when wet, green-white throughout; testal cells honeycomb-shaped when lateral walls removed by enzyme digestion.
Chromosome number: 

2n = 2x = 24 voucher: Ochoa 1490 (CIP) (Hijmans, et al. 2007)


Northern Peru (Dept. Cajamarca), rocky slopes, among bushes; 2200-3000 m in elevation.

Flowering and fruiting from March to May.

Solanum cajamarquense is a member of Solanum sect. Petota Dumort., the tuber-bearing cultivated and wild potatoes. Within sect. Petota, Solanum cajamarquense is a member of a distinctive clade of southern Ecuadorian and Peruvian species formerly classified in series Piurana and some other series that frequently possess moniliform tubers and shiny coriaceous leaves, although this species has pubescent leaves. On a higher taxonomic level, it is a member of the informally-named Potato Clade, a group of perhaps 200-300 species that also includes the tomato and its wild relatives (Bohs, 2005).


Solanum cajamarquense is a very distinct species. It is extremely pubescent, with the terminal leaflet distinctly ovate and is unlikely to be confused with any other wild potato species.


Ochoa, C.M. 1999. Las papas de sudamerica: Peru (Parte I).
Lima, Peru: International Potato Center.

Bohs, L. 2005. Major clades in Solanum based on ndhF sequences.
Pp. 27-49 in R. C. Keating, V. C. Hollowell, & T. B. Croat (eds.), A festschrift for William G. D’Arcy: the legacy of a taxonomist. Monographs in Systematic Botany from the Missouri Botanical Garden, Vol. 104. Missouri Botanical Garden Press, St. Louis.

Hijmans, R., T. Gavrilenko, S. Stephenson, J. Bamberg, A. Salas & D.M. Spooner 2007. Geographic and environmental range expansion through polyploidy in wild potatoes (Solanum section Petota).
Global Ecol. Biogeogr. 16: 485-495.

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