. A revision of Trisetum (Poaceae: Pooideae: Aveninae) in South America

FINOT, V. L., PETERSON, P. M., ZULOAGA, F. O., SORENG, R. J. & MATTHEI, O

ANNALS OF THE MISSOURI BOTANICAL GARDEN

Missouri Botanical Garden

Lugar: St. Louis, Missouri, EEUU; Año: 2005 vol. 92 p. 533 - 568

0026-6493

    ABSTRACTA taxonomic treatment of Trisetum Pers. for South America, is given. Eighteen species and six varieties of Trisetumare recognized in South America. Chile (14 species, 3 varieties) and Argentina (12 species, 5 varieties) have thegreatest number of taxa in the genus. Two varieties, T. barbinode var. sclerophyllum and T. longiglume var. glabratum,are endemic to Argentina, whereas T. mattheii and T. nancaguense are known only from Chile. Trisetum andinum isendemic to Ecuador, T. macbridei is endemic to Peru, and T. foliosum is endemic to Venezuela. A total of four speciesare found in Ecuador and Peru, and there are two species in Venezuela and Colombia. The following new species aredescribed and illustrated: Trisetum mattheii Finot and T. nancaguense Finot, from Chile, and T. pyramidatum Louis-Marie ex Finot, from Chile and Argentina. The following two new combinations are made: T. barbinode var. sclerophyllum(Hack. ex Stuck.) Finot and T. spicatum var. cumingii (Nees ex Steud.) Finot. A key for distinguishing the species andvarieties of Trisetum in South America is given. The names Koeleria cumingii Nees ex Steud., Trisetum sect. AnaulacoaLouis-Marie, Trisetum sect. Aulacoa Louis-Marie, Trisetum subg. Heterolytrum Louis-Marie, Trisetum subg. IsolytrumLouis-Marie, Trisetum subsect. Koeleriformia Louis-Marie, Trisetum subsect. Sphenopholidea Louis-Marie, Trisetum malacophyllumSteud., Trisetum variabile E. Desv., and Trisetum variabile var. virescens E. Desv. are lectotypified.Key words: Aveninae, Gramineae, Poaceae, Pooideae, Trisetum.