A Phytosociological Study on Andean Rainforests of Peru, and a Comparison with the Surrounding Countries.

This work is a phytosociological approach to the montane rainforests of Peru with the aim of advancing on the diversity of plant communities, which we had already begun in previous research. From 364 phytosociological plots and 3389 species of the South American tropics, we have developed a cluster, using the Sørensen index, to know the similarities between the forests and their parallelism with bioclimatic conditions. After studying the existence of characteristic groups of the Peruvian forests, we have established different communities and phytosociological units for Peru.

(Caryophyllaceae), a new species from the Andes of Cajamarca (North Peru).

A new species from the Northern Peruvian Andes (Cajamarca department), , is proposed in the present paper. It grows in the high-elevation montane grasslands and it is morphologically similar to from which it differs in having elliptic-ovate leaves, blade margin bases glandular, large number of stipules arranged in a pedicel form at the leaf axis and by the short and glandular pedicels. A detailed description, original photographs and a location map are provided, as well as an updated diagnostic key of Drymaria Ser.