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American Journal of Botany, Vol 85, 387, Copyright © 1998 by Botanical Society of America, Inc.

SYSTEMATICS

Chloroplast DNA characters, phylogeny, and classification of Lathyrus (Fabaceae)

CB Asmussen and A Liston

Mapped cpDNA restriction site characters were analyzed cladistically and the resulting phylogenetic hypotheses were used to test monophyly and relationships of the infrageneric classification of Lathyrus (Fabaceae) proposed by Kupicha (1983, Notes from the Royal Botanic Garden Edinburgh 41: 209-244). The validity of previously proposed classification systems and questions presented by these classification schemes were explored. Two cpDNA regions, rpoC (rpoC1, its intron, part of rpoC2, and their intergenic spacer) and IR- (psbA, trnH-GUG, part of ndhF, and their intergenic spacers), were analyzed for 42 Lathyrus and two Vicia species. PCR (polymerase chain reaction) amplified rpoC and IR- products digested with 31 and 27 restriction endonucleases, respectively, resulted in 109 potentially informative characters. The strict consensus tree suggests that several of Kupicha's sections may be combined in order to constitute clades. The widespread section Orobus and the South American section Notolathyrus should be combined. Section Lathyrus, characterized by a twisted style, should either include sections Orobon and Orobastrum or be redefined as three sections, one of which is characterized by a 100 base pair deletion in the IR- region. Finally, a weighted parsimony analysis positions sections Clymenum (excluding L. gloeospermus) and Nissolia, both with phyllodic leaves, as sister sections. The affiliation of Lathyrus gloeospermus (section Clymenum) remains problematic.


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