Solanum, Bitter, Bitter

Spooner, David M., Van Den Berg, Ronald G., Peña, Antonio Rivera-, Velguth, Peter, Rio, Alfonso Del & López, Alberto Salas-, 2001, Taxonomy of Mexican and Central American Members of Solanum Series Conicibaccata (sect. Petota), Systematic Botany 26 (4), pp. 743-756 : 752

KEY TO THE MEXICAN AND CENTRAL AMERICAN MEMBERS OF SOLANUM SERIES CONICIBACCATA

1. Leaves with (3)6–7(8) pairs of lateral leaflets and 4–31 interjected leaflets; corollas bluish purple.......... S. agrimonifolium .

1. Leaves with (2)3–6(8) pairs of lateral leaflets and 0–6(8) interjected leaflets, corollas white to blue to purple.

2. Leaves shiny, glabrous or with scattered 1–2 celled short hairs; fresh seeds greenish with a conspicuous purple spot caused by the purple embryo showing through the seed coat; corollas pure white to blue or purple......... S. longiconicum .

2. Leaves not shiny, but finely to coarsely pubescent; fresh seeds greenish throughout and without a spot; corollas typically bluish purple to purple, only rarely white)................................................ 3

3. Larger leaves typically 15–25 cm long, with (3)4–6(8) pairs of lateral leaflets; southeastern Mexico....... S. oxycarpum .

3. Leaves typically 25–40 cm long, with (2)3–5 pairs of lateral leaflets; western Panama............... S. woodsonii .