INVESTIGADORES
ZULOAGA Fernando Omar
artículos
Título:
Mayariochloa, a new monotypic genus segregated from Scutachne (Poaceae: Panicoideae: Paniceae).
Autor/es:
SALARIATO, D.L.; MORRONE, O.; F.O. ZULOAGA
Revista:
SYSTEMATIC BOTANY
Editorial:
AMER SOC PLANT TAXONOMISTS
Referencias:
Año: 2012 vol. 37 p. 105 - 116
ISSN:
0363-6445
Resumen:
The genus Scutachne (Poaceae, Paniceae) is revised. This American genus, which included two species from the Caribbean, wascircumscribed on the basis of morphological and molecular characters. To analyze both species of the genus, S. amphistemon and S. dura, adetailed study of the micromorphology of the upper anthecium and leaf anatomy, together with exomorphological characters, wasperformed. Both species differ in vegetative and reproductive characters, including blade distribution, ligules, presence of axillary inflorescences,consistency of upper glume, lower lemma, and lower palea, presence of a lower flower, upper anthecium ornamentation, andpresence of a rachilla extension. Anatomically, S. dura is a C4 PCK species, while S. amphistemon is a C3, non-Kranz taxon. The molecularphylogenetic analysis supports these morphological differences. As a result, we concluded that Scutachne, as presently circumscribed, is apolyphyletic genus. Therefore, the genus is here redefined and S. amphistemon is transferred to the new genus Mayariochloa. Affinities of thenew genus with other genera of Paniceae are also discussed.