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TAXONOMIC RELATIONSHIPS OF TEXAS SPECIMENS OF "DIGITARIA CILIARIS" AND "DIGITARIA BICORNIS" (POACEAE)

ROBERT D. WEBSTER and STEPHAN L. HATCH
SIDA, Contributions to Botany
Vol. 9, No. 1 (APRIL 1981), pp. 34-42
Stable URL: http://www.jstor.org/stable/41966583
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
TAXONOMIC RELATIONSHIPS OF TEXAS SPECIMENS OF "DIGITARIA CILIARIS" AND "DIGITARIA BICORNIS" (POACEAE)
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Abstract

Numerical techniques were used to clarify the taxonomic relationships between two closely related grasses, Digitaria ciliaris and Digitaria bicornis. Principal component analysis illustrated distinct specimen clusters, whereas a correlation phenogram showed a distinct dissimilarity between the species and high degree of similarity among populations within the species. A multiple discriminant analysis procedure showed that there were no misclassifications of the specimens. Digitaria bicornis was found to have a shorter distance to the first lateral nerve on the lemma of the lower floret, a longer second glume, and a shorter first glume. Minor characters included a shorter main axis and a longer average rachis length. The length of the second glume, main axis, and rachis were characters previously not considered as taxonomically important. A nested analysis of variance showed these characters to have more than 70 percent of the measured morphological variation due to differences between species.

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