Revisión sistemática y análisis cladístico del género Chaetium (Poaceae: Panicoideae: Paniceae)

MORRONE, O.; ZULOAGA, F. O.; ARRIAGA, M. O.; POZNER, R.; ALISCIONI, S. S.

ANNALS OF THE MISSOURI BOTANICAL GARDEN

Allen Press

Lugar: St. Louis; Año: 1998 p. 404 - 424

0026-6493

Chaetium (Poaceae: Panicoideae: Paniceae) is a Neotropical genus of three species, ranging from Mexico, and the Antilles to northern South America. The genus is mainly defined by having an oblique articulation of the spikelet, a hairy callus at the base of the spikelet, and a linear hilum on the caryopsis. Morphological and anatomical characters were considered in the present treatment; two anatomical patterns were found in the transverse section of the leaves. A cladistic analysis was carried out using 29 morphological characters; the results have shown that Chaetium forms a monophyletic clade, based on exomorphological and leaf anatomical data. A key to the species as well as an anatomical description of the genus and photomicrographs of the species, morphological description, illustrations, and a distribution map are presented.