n= 12 (Moyetta et al. 2013; voucher Chiarini et al. 821).
Solanum concarense is endemic to central Argentina in San Luis province, along the road from Concarán to Santa Rosa; known from a single population in Prosopis forest at ca. 800 m elevation.
Solanum concarense is a member of the Dulcamaroid clade, and shares with that group the distinctive pedicel sleeves and green spots at the base of the corolla lobes.
Solanum concarense is an exceptionally rare species; it is known from a single population along the old dirt track from Concarán to Santa Rosa, in an area that is highly anthropogenically altered for agriculture and ranching. The population is found along the road bank in deep, sandy soil at the foot of Prosopis trees. Various groups of collectors have searched for additional populations, but to no effect.
Plants grown in cultivation (from rhizomes) have set no fruit (G.E. Barboza, pers. comm.), so the species is quite possibly self-incompatible. This may indicate that the known population is composed of several individuals or that there are additional populations not yet encountered.
Morphologically S. concarense is very similar to S. triflorum of the Morelloid clade, with fleshy, deeply pinnatifid leaves, but differs in its larger flowers with creamy yellow, ellipsoid anthers and berries with eight large stone cells versus flowers with bright yellow narrowly ellipsoid anthers and berries with many small stone cells. Solanum triflorum is an annual herb, while S. concarense is clearly a rhizomatous perennial. Barboza et al. (2013) treated this species as a member of the Morelloid clade in Flora Argentina, but more recent molecular work (E. Gagnon, pers comm.) has shown it to be deeply nested in the Dulcamaroid clade. Solanum concarense shares the morphological synapomorphy of the Dulcamaroid calde (Knapp 2013) of the deep pedicel sleeve; a cup-shaped structure in which the base of the pedicel is inserted.
Barboza GE, Knapp S, Särkinen T (2013) Grupo VII. Moreloide. In Anton AM, Zuloaga FO (Eds), Barboza GE (coord.) Flora Argentina vol. 13, Solanaceae. IOBDA- IMBIV, CONICET: Buenos Aires & Córdoba, Argentina, 231-264.
Knapp S (2013) A revision of the Dulcamaroid Clade of Solanum L. (Solanaceae). PhytoKeys 22: 1-432.
Moyetta NR, Steifkens LB, Bernardello G (2013) Karyotypes of South American species of the Morelloid and Dulcamaroid clades (Solanum, Solanaceae). Caryologia 66: 333-345.
Known from a single population, Solanum concarense is Data Deficient (DD) using IUCN Criteria; however, it should be considered critically at risk due to its extremely restricted range in an area of high anthropogenic disturbance and activity.