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Based on new information on floral structures, seedling, fruit, seed, root, and leaflet characters, Phaseolus dasycarpus is re-described and illustrated. Its chromosome number was determined as 2n= 22, with metacentric and submetacentric chromosomes, and karyotype formula of 9m + 2sm. Previous phylogenetic analyses of ITS and trnK sequence data, and those obtained in the present study,...
Agave vivipara L. andA. angustifolia Haw., considered conspecific by Wijnands, are shown to be two distinct species. A previous neotypification (as a lectotypification) ofA. angustifolia by Gentry is superseded because it is in conflict with the protologue; a new neotype is designated herein. The economic importance ofA. angustifolia is summarized.
Lithophytum, assigned by different workers to Solanaceae, Verbenaceae, and Hydrophyllaceae, is shown to be congeneric with Plocosperma Benth., variously referred to Loganiaceae, Apocynaceae, and Plocospermaceae.
Helietta lottiae, a new species from tropical deciduous forest from Guerrero and Jalisco, Mexico, is described. A key to the North American species of the genus and their geographical distribution are presented.
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