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Publication Type J
Authors Bell, HL; Columbus, JT
Author Full Name Bell, Hester L.; Columbus, J. Travis
Title Proposal for an expanded Distichlis (Poaceae, Chloridoideae): Support from molecular, morphological, and anatomical characters
Source SYSTEMATIC BOTANY
Language English
Document Type Review
Author Keywords biogeography; generic delimitation; Monanthochloe; phylogeny; Reederochloa; taxonomy
Keywords Plus INTERNAL TRANSCRIBED SPACER; C-4 GRASSES POACEAE; SEQUENCE DATA; PHYLOGENETIC INFERENCE; SALT-GLANDS; CHLOROPLAST DNA; NUCLEAR; ULTRASTRUCTURE; GRAMINEAE; ACID
Abstract The Distichlis clade comprises Distichlis (7 species), Monanthochloe (2), and Reederochloa (1). All species except D. distichophylla (endemic to Australia) and D. spicata (widespread in the New World) are restricted either to North or South America. We investigated phylogenetic relationships within the clade using chloroplast (trnL-F and ndhF) and nuclear ribosomal (internal transcribed spacers and 5.8S) DNA sequences. We also studied lemma micromorphology, leaf blade anatomy, macromorphology, and biogeography in a phylogenetic context. The Distichlis clade is strongly supported in the molecular analyses, A morphological synapomorphy for the clade is the presence of a single papilla on the center of each subsidiary cell of lemma stomata. Other diagnostic features include dioecy, rhizomes or stolons, conspicuously distichous leaves, 5-13 lemma nerves, dumbbell- or flask-shaped bicellular microhairs with sunken basal cells, and growth in alkaline or saline soils. The nuclear and chloroplast phylogenies indicate that Monanthochloe and Reederochloa are nested within a paraphyletic Distichlis, and a number of structural characters, including leaf blade length, number of spikelets per inflorescence, and number of florets per spikelet, also fall within the range of variation in Distichlis. Therefore, we propose expanding the circumscription of Distichlis to include Monanthochloe; and Reederochloa, and make the following new combinations: Distichlis acerosa, D. eludens, and D. littoralis. Biogeographical analysis revealed that the group likely originated in North America followed by a number of long-distance dispersal events, including back dispersals.
Author Address [Bell, Hester L.; Columbus, J. Travis] Rancho Santa Ana Bot Garden & Claremont Grad Univ, Claremont, CA 91711 USA
Reprint Address Bell, HL (reprint author), Rancho Santa Ana Bot Garden & Claremont Grad Univ, 1500 N Coll Ave, Claremont, CA 91711 USA.
E-mail Address hester.bell@cgu.edu
Funding Agency and Grant Number Andrew W. Mellon Foundation; National Science Foundation [DBI 0070377]
Funding Text C. R. Annable, L. G. Clark, R. S. Felger, E. A. Friar, J. M. Porter, L. M. Prince, L. L. Worlow and two anonymous reviewers read earlier versions of this manuscript and gave many helpful suggestions that improved the final version. We thank J. M. Porter for guidance with phylogenetic analyses. L. M. Prince provided instruction for primer desigh. N. Fraga and E. Kempton helped with the ArcGIS software. Thanks to N. Refulio and B. Carey for help with the SEM. N. Walsh (MEL) provided the specimens of D. distichyphylla. P. Peterson (US) and N. Refulio (RSA) provided specimens of D. humilis. S. Jacobs facilitated a loan from NSW.F.Zuloga (SI). R. Tortosa and A. Vega (BAA), A. Anton (CORD), and M. Munoz-Schick, E. Barrera, and E. Olate (SGO) provided access to herbaria and facilitated collecting in Argentina and Chile. Lon Bell provided support and encouragement at every stage of this project. This work represents a portion of a dissertation submitted to Claremont Graduate University by HLB. This research was supported by the Andrew W. Mellon Foundation, RSABG Alumni Research Award, the Goldhamer Scholarship Award, and an equipment grant to Rancho Santa Ana Botanic Garden from the National Science Foundation (DBI 0070377).
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Cited Reference Count 106
Times Cited 20
Total Times Cited Count (WoS, BCI, and CSCD) 28
Publisher AMER SOC PLANT TAXONOMISTS
Publisher City BRONX
Publisher Address NEW YORK BOTANICAL GARDEN, BRONX, NY 10458-5126 USA
ISSN 0363-6445
29-Character Source Abbreviation SYST BOT
ISO Source Abbreviation Syst. Bot.
Publication Date JUL-SEP
Year Published 2008
Volume 33
Issue 3
Beginning Page 536
Ending Page 551
Digital Object Identifier (DOI) 10.1600/036364408785679879
Subject Category 16
Document Delivery Number Plant Sciences; Evolutionary Biology
Unique Article Identifier Plant Sciences; Evolutionary Biology
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