Browsing by Subject "NORTH-AMERICA"
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Item Open Access Isozymic and Chromosomal Evidence for the Allotetraploid Origin of Gymnocarpium dryopteris (Dryopteridaceae)(Systematic Botany, 1993-01) Pryer, KM; Haufler, CHItem Open Access The paraphyly of Osmunda is confirmed by phylogenetic analyses of seven plastid loci(Systematic Botany, 2008-03-01) Metzgar, JS; Skog, JE; Zimmer, EA; Pryer, KMTo resolve phylogenetic relationships among all genera and subgenera in Osmundaceae, we analyzed over 8,500 characters of DNA sequence data from seven plastid loci (atpA, rbcL, rbcL-accD, rbcL-atpB, rps4-trnS, trnG-trnR, and trnL-trnF). Our results confirm those from earlier anatomical and single-gene (rbcL) studies that suggested Osmunda s.l. is paraphyletic. Osmunda cinnamomea is sister to the remainder of Osmundaceae (Leptopteris, Todea, and Osmunda s.s.). We support the recognition of a monotypic fourth genus, Osmundastrum, to reflect these results. We also resolve subgeneric relationships within Osmunda s.s. and find that subg. Claytosmunda is strongly supported as sister to the rest of Osmunda. A stable, well-supported classification for extant Osmundaceae is proposed, along with a key to all genera and subgenera. © Copyright 2008 by the American Society of Plant Taxonomists.