Variabilidad morfológica de las especies del complejo Poa resinulosa (Poaceae) y su relación con las especies de la sección Dioicopoa. Darwiniana

FERNANDEZ-PEPI M. G. , L. M. GIUSSANI Y O. MORRONE.

DARWINIANA

INSTITUTO DE BOTÁNICA DARWINION

Lugar: Buenos Aires; Año: 2008 p. 279 - 296

0011-6793

The Poa resinulosa complex includes a group of disjunct but morphologically similar species: P.calchaquiensis, P. pedersenii, and P. resinulosa. To evaluate and analyze the species of the Poa resinulosacomplex and related species, we measured 40 morphological and anatomical characters in specimensof Poa calchaquiensis, P. lanigera, P. pilcomayensis, and P. resinulosa. This data set was analysedtogether with a previous matrix of Poa section Dioicopoa (Giussani, 2000), also including P.nubensis, a new species similar to P. calchaquiensis. By means of the principal components analysisand statistical tests, the species of the P. resinulosa complex were circumscribed. Poa resinulosa is describedas a new variety of P. ligularis, distinguished by its shorter ligule, shorter leaves and culms, broaderblades and minor stomata. A key for the identification of Poa ligularis var. resinulosa and relatedtaxa is presented together with a map representing the geographical distribution of both varieties of P.ligularis.