Portal de Periódicos da CAPES

DE MACROCARPAEAE GRISEBACH (EX GENTIANACEIS) SPECIEBUS NOVIS : IV: ELEVEN NEW SPECIES OF MACROCARPAEA (GENTIANACEAE: HELIEAE) FROM CENTRAL AND SOUTH AMERICA, AND THE FIRST REPORT OF THE PRESENCE OF STIPULES IN THE FAMILY

2003; Harvard University Press; Volume: 8; Issue: 1 Linguagem: Inglês

1938-2944

Jason R. Grant, Richard E. Weaver,

Botany and Geology in Latin America and Caribbean

Progress toward a taxonomic revision of Macrocarpaea(Gentianaceae: Helieae) has revealed numer- ous novelties in this morphologically diverse and unexpectedly species-rich genus. Eleven new species are here described and illustrated from Central and South America: Colombia ( M. nicotianifolia and M. schultesii), Costa Rica (M. auriculata), Ecuador (M. subsessilis), Peru (M. gracilis, M. maguirei, M. wurdackii, and M. zophoflora), and Venezuela (M. ewaniana, M. papillosa, and M. weaveri). Macrocarpaea zophoflorais notable for being the first species to be described of Gentianaceae that is known, or recognized, to have free deciduous interpetiolar stipules. The family was previously defined as exstipulate without exception. Preliminary work on Macrocarpaea by R.E.W. in the early 1980's revealed numerous new species in this morphologically diverse genus. Eleven species identified during those studies are here described for a monograph of the genus being prepared by J.R.G. for Flora Neotropica. These species are from Colombia (M. nicotianifolia, and M. schultesii), Costa Rica (M. auriculata), Ecuador (M. subsessilis), Peru (M. gracilis, M. maguirei, M. wurdackii, and M. zophoflora), and Venezuela (M. ewani- ana, M. papillosa, and M. weaveri) (Fig. 1). The genus has long been underestimated for its species diversity. Hundreds of collections have been made in remote regions of the Neotropics in the past 50 years, yielding over 20 times the number of specimens that were available to Ewan during preparation of the only existing monograph of the genus (Ewan 1948). It is not surprising therefore that by careful examination of a large number of spec- imens, that additional and more refined taxo- nomic groups can be defined.