Abstract
Total alkaloidal extracts from four closely related Lobelia species, L. cardinalis L., L. syphilitica L., L. puberula Michaux, and L. elongata Small, and ten crosses and hybrids involving L. cardinalis and L. syphilitica, were examined using two-phase descending paper chromatography with formamide-ammonium formate-formic acid as the stationary phase and chloroform-benzene as the mobile phase. The chromatogram of L. elongata showed the presence of lobinaline, suggesting its closer relationship with L. cardinalis. The chromatograms of L. cardinalis, L. syphilitica, and L. puberula were different from each other, suggesting the elaboration of different alkaloids by each of these related species. Lobinaline was present in the first species and absent in the latter two species. The L. cardinalis × L. syphilitica hybrids gave chromatograms suggesting the elaboration of alkaloids characteristic of both the parent plants.
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