2n = ploidy missing =48 voucher missing = (Spooner & Hijmans 2001)
Southern Mexico (Chiapas), southeast through Guatemala and central Honduras, 1800-3400 (3800) m; in wet habitats, in organic soils, in full sun to partial shade, often in openings of cloud forests. Common habitats include recently logged or otherwise recently disturbed areas in valleys, streamsides, upland marshes, or roadside ditches.
Solanum agrimonifolium belongs to the potato clade of Solanum (Bohs, in press). Spooner and Sytsma (1992) placed S. agrimonifolium on the most terminal clade of section Petota based on chloroplast DNA restriction site data. Spooner et al. (2004) erected the Conicibaccata group to contain S. agrimonifolium, S. longiconicum, S. oxycarpum, and S. woodsonii. All four of these species form a “polyploid ser. Conicibaccata clade” distinguished from the diploid species of the series by chloroplast DNA and morphological data (Castillo and Spooner 1997). These four species are morphologically distinguished (sometimes with difficulty) as a group by conical fruits, leaves with a somewhat parallel-sided morphology (mentioned in the descriptions as lateral leaflet pairs subequal or diminishing gradually towards the base) and narrowly ovate to elliptical leaflets (Spooner et al. 2001). The species evaluated in North and Central America are all 4x(2EBN) (S. longiconicum is not yet evaluated for EBN, and S. woodsonii is not yet evaluated for ploidy and EBN). Some related species traditionally placed in ser. Conicibaccata in South America are also 4x(2EBN), and others are 2x(2EBN) and 6x(4EBN). All species in North and Central America, like related species in South America, generally grow in moist organic soils in upland rain forests.
Spooner, D.M. & K.J. Sytsma 1992. Reexamination of series relationships of Mexican and Central American wild potatoes (Solanum sect. Petota): evidence from chloroplast DNA restriction site variation.
Syst. Bot. 17:432-448.
Castillo-T., R. 1995. Phylogenetic relationships of wild potatoes, Solanum series Conicibaccata (sect. Petota).
Ph.D. Thesis, University of Wisconsin-Madison.
Castillo-T., R., & D.M. Spooner 1997. Phylogenetic relationships of wild potatoes, Solanum series Conicibaccata (sect. Petota).
Syst. Bot. 22: 45-83.
Spooner, D.M., R.G. van den Berg, A. Rivera-Peña, P. Velguth, A. del Rio, & A. Salas 2001. Taxonomy of Mexican and Central American members of Solanum series Conicibaccata (sect. Petota).
Syst. Bot. 26: 743-756.
Spooner, D.M. & R.J. Hijmans 2001. Potato systematics and germplasm collecting, 1989-2000.
Amer. J. Potato Res. 78:237-268; 395.
Spooner, D.M., R.G. van den Berg, A. Rodríguez, J. Bamberg, R.J. Hijmans, & S.I. Lara-Cabrera 2004. Wild potatoes (Solanum section Petota; Solanaceae) of North and Central America.
Syst. Bot. Monog. 68: 1-209 + 9 plates.
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.
Chloroplast DNA restriction site data available in: Spooner and Sytsma (1992) and Castillo (1995).
Solanum agrimonifolium, like all four species in the Conicibaccata group, is distinguished by conical fruits, leaves with a somewhat parallel-sided morphology (mentioned in the descriptions as lateral leaflet pairs subequal or diminishing gradually towards the base) and narrowly ovate to elliptical leaflets. As with most species from North and Central America, however, it is distinguished from its most similar species (S. longiconicum, S. oxycarpum, and S. woodsonii) only by a series of overlapping character states. Solanum agrimonifolium is distinguished from the above by its highly dissected leaves, with generally 6-7 lateral leaflets and 4-31 interjected leaflets), in contrast to the other species with generally 3-6 lateral leaflets and 0-6 interjected leaflets.
The southernmost records of S. agrimonifolium were collected in Honduras, from Montaña La Tigre, all clustered within a few km of each other. Spooner et al. (2004) were not able to find the plants on our searches there in 2000 and the species may no longer grow in Honduras.