You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. 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)
ROBERT D. WEBSTER and STEPHAN L. HATCH
SIDA, Contributions to Botany
Vol. 9, No. 1 (APRIL 1981), pp. 34-42
Published by: The Botanical Research Institute of Texas, Inc.
Stable URL: http://www.jstor.org/stable/41966583
Page Count: 9
You can always find the topics here!Topics: Spikelets, Nerves, Florets, Glumes, Taxa, Species, Plant morphology, Biological taxonomies, Species populations, Bracts
Were these topics helpful?See somethings inaccurate? Let us know!
Select the topics that are inaccurate.
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.
Preview not available
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.
SIDA, Contributions to Botany © 1981 The Botanical Research Institute of Texas, Inc.