Systematics Section / ASPT
Bell, Hester L. , Columbus, J. Travis .
Relationships within the Distichlis clade inferred from molecular, anatomical, and micromorphological characters.
We investigated relationships within the Distichlis clade, comprising Distichlis (7 species), MonanthochloÃ« (2), and Reederochloa (1), using DNA sequence data from the nuclear internal transcribed spacer region and chloroplast trnL–F and ndhF, macromorphology, leaf blade transectional anatomy, and lemma micromorphology. Except for one Australian species, the group is limited to the New World and occurs in both hemispheres. The Distichlis clade is supported as monophyletic; however, there is conflict between the nuclear and chloroplast markers in the placement of D. humilis, D. laxiflora, and D. scoparia. The genus Distichlis is not monophyletic in either phylogeny. Characters diagnostic for this group include dioecy, growth in saline/alkaline soils, rhizomes and/or stolons, lemma nerves 7–13, and bicellular microhairs with basal cells sunken into the epidermis. In this study we observed stomates on lemmas of all species. Species distributions and ranges of variation in three macromorphological characters—leaf blade length, numbers of spikelets per inflorescence, and numbers of florets per spikelet—will be discussed. As well, the taxonomic implications of these data and analyses will be presented.
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1 - Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, California, 91711, USA
2 - Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, California, 91711, USA
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Presentation Type: Oral Paper:Papers for Sections
Location: Continental A/Hilton
Date: Tuesday, July 10th, 2007
Time: 9:30 AM