New or critical Euphorbiaceae from the Americas

New Euphorbiaceae from Mexico

This article conta ined descriptions of five new taxa of Mexican Euphorbiaceae. Euphorbia (sub g. Agaloma) na yarensis is endemic to pine-oak woodland in the mount ains of central Nayarit. It appears related to E. so ob yi but differs by possessing linear to linear-ovate leaves. Croton varelae is also endemic to central Nayarit. A key was provided to distinguish this spec ies. a member of sect....

Eight Americas: A New Definition for “Americas”?

Sam Singer In their essay in October’s PLoS Medicine, Daniel Reidpath and Kit Yee Chan challenge the widely cited link between HIV-related stigma and the spread of the epidemic [1]. This is an important question, given the heavy emphasis on stigma in policies of the World Health Organization, the Joint United Programme on HIV/AIDS, and other public health institutions, but in making their argum...

A New Species of Jatropha (euphorbiaceae) from Nicaragua'

When Jatropha costaricensis Webster & Poveda was described from Guanacaste, Costa Rica, some years ago (Webster & Poveda, 1978), it was predicted that other xeric relict taxa might be discovered elsewhere in Central America. Recent botanical exploration in Nicaragua has disclosed not only a number of new populations of Jatropha podagrica Hook. in rocky areas in Dept. Esteli, but also on basalti...

(euphorbiaceae) from Colombia

A new species, Phyllanthus mutisianus, is described on the basis of a collection from Colombia made by the expedition of Jose Mutis. It is distinguishable from all other neotropical species of Phyllanthus by virtue of the distinctive leaf venation and very long fruiting pedicels. The type specimen lacks mature flowers, but the vegetative morphology, inflorescence, and fruiting structures sugges...

Tobacco or health: status in the Americas.