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Notes on Pappophorum (Gramineae: Pappophoreae)

John R. Reeder and L. J. Toolin
Systematic Botany
Vol. 14, No. 3 (Jul. - Sep., 1989), pp. 349-358
DOI: 10.2307/2418925
Stable URL: http://www.jstor.org/stable/2418925
Page Count: 10
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Notes on Pappophorum (Gramineae: Pappophoreae)
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Abstract

The American genus Pappophorum, with species in both Northern and Southern hemispheres, has been a source of considerable taxonomic confusion. During the past two decades, various agrostologists have estimated the number of species to be from 9 to 20. Not only has there been disagreement regarding the number of species, the application of various binomials has differed among specialists who have studied the group. Three names that have continued to be applied in different senses are: P mucronulatum, P. subbulbosum, and P. vaginatum Buckley, non Philippi. For many years the name P mucronulatum was applied to plants from both North and South America, and P. subbulbosum and P. vaginatum were relegated to synonymy under that name. Some recent botanists have held that only P. pappiferum and perhaps P. subbulbosum are amphitropic, whereas P. vaginatum is restricted to North America, and P mucronulatum and P. subbulbosum, both distinct species, occur only in South America. Authors of the present study recognize only eight species for the genus. Pappophorum mucronulatum is treated as a South American species, which is restricted to Brazil, Colombia, and Venezuela. Pappophorum vaginatum, with P. subbulbosum as a synonym, occurs in the southwestern United States and Mexico, and also in Argentina and Uruguay. A key to the species along with the important synonymy is provided.

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