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Abstract
In an effort to study plants of the Rubiaceae from Panama, 299 herbarium samples, representing 133 species, were subjected to alkaloid screening. From this total, 234 samples (78%) afforded a positive test for alkaloids, and 99 samples (33%) gave a positive reaction for indole alkaloids; 109 species (82%) contain alkaloids and 58 (44%) produce indole alkaloids. This is the first time that 102 (94%) and 52 (90%) species are reported as alkaloid and indole alkaloid bearing, respectively. The results of 10 out of 15 species, that is 67%, corroborate earlier studies. The richest indole alkaloid species were: Hamelia patens, Hamelia xerocarpa, Hoffmannia morii, Hoffmannia unguis-canceris, Deppea grandiflora, Elaeagia nitidifolia, Rondeletia secunda, Simira maxonii, Uncaria tomentosa, Gonzalagunia rosea, Isertia haenkeana, Isertia laevis, Posoqueria latifolia and Cinchona pubescens.