Agrostopoa (Poaceae, Pooideae, Poeae, Poinae), a New Genus with Three Species from Colombia

نویسندگان

  • Gerrit Davidse
  • John S. Lehmann
  • Robert J. Soreng
  • Paul M. Peterson
چکیده

Agrostopoa Davidse, Soreng & P. M. Peterson, a new genus endemic to the páramos of Colombia, is proposed. The genus includes two new species, A. barclayae Davidse, Soreng & P. M. Peterson and A. woodii Soreng, P. M. Peterson & Davidse, and a third species transferred from Muhlenbergia Schreber, A. wallisii (Mez) P. M. Peterson, Soreng & Davidse (lectotype designated here). A key for determining the species and illustrations of the three species are provided. Agrostopoa is placed in subfamily Pooideae because it has non-Kranz anatomy and lanceolate membranous lodicules, and in tribe Poeae where it differs from Agrostis L. by having carinate lemmas with a terminal awn or mucro, well-developed paleas, and peculiar synflorescences with recurved branches and fragile pedicels. It is classified near Poa L., but differs from that in its single-flowered spikelets that lack rachilla extensions and possess awned or mucronate lemmas. RESUMEN . Se propone Agrostopoa Davidse, Soreng & P. M. Peterson como un género nuevo endémico de los páramos de Colombia. El genero incluye dos especies nuevas: A. barclayae Davidse, Soreng & P. M. Peterson y A. woodii Soreng, P. M. Peterson & Davidse; y las tres especies transferidos de Muhlenbergia Schreber: A. wallisii (Mez) P. M. Peterson, Soreng & Davidse (lectotipo designado aquı́). Se presenta una clave de determinación y las ilustraciones de esas tres especies. Agrostopoa pertenese a la subfamilia Pooideae basado sobre la anatomı́a foliar de non-Kranz y el tipo de las lodiculas cuales son membranosas y lanceoladas, y a la tribu Poeae donde Agrostopoa se diferencia de Agrostis L. por tener las lemas carinadas con una arista o un mucron terminal, las paleas bien desarolladas y las inflorescencias peculiares con las ramas curvadas y los pedicelos frágiles. Segun la esquema de clasificación Agrostopoa es aproximada a Poa L., pero se diferencia de ése genero por tener las espiguillas con una sola flor que carecen la extensión de rachilla, y tienen las lemas aristadas o mucronadas.

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تاریخ انتشار 2009