Rupert Barneby and his legume legacy
Hughes, Colin E. , Eastwood, Ruth J. .
Andean Lupinus (Leguminosae - Papilionoideae) - Barneby.
Barneby’s treatment of Lupinus for the Intermountain Flora shines through the otherwise diffuse and contrary literature surrounding the perennial North American species as a template for delimitation of species elsewhere in the genus. Barneby’s aim was to balance undesirable simplification and progressive lack of definition of species in the face of observed continuities in character states, against the alternative of placing greater emphasis on differences between minor races, which leads inexorably to what he described as the quicksands that ultimately engulfed Charles Piper Smith, and which results in the sort of taxonomic chaos that prevails in the Andes. In so doing he demonstrated his pragmatic genius for delimiting species in taxonomically difficult, species-rich groups. Here we discuss results of on-going research on the Andean species of Lupinus and their relationships, using field, morphological and molecular data. Previous analyses of species relationships within Lupinus using ITS and cpDNA data provided only limited resolution and were based on inadequate taxon sampling. We present separate and combined analyses of more densely sampled ITS and new cycloidea (LEGCYC1A) data sets. These analyses suggest that the majority of the ca. 70 Andean species form a monophyletic lineage derived from North American elements that is quite separate from the lineage containing the lowland South American species. Adding the cycloidea data provides greater resolution and support across the genus as a whole, but only very limited resolution among the Andean species, suggesting that they may represent a more rapid diversification than other groups in the genus. This is discussed in relation to new work to find more rapidly evolving DNA sequence regions, the marked lack of discrete morphological characters, and predominance of independently variable quantitative traits among the Andean species.
1 - University of Oxford, Department of Plant Sciences, South Parks Road, Oxford, OX1 3RB, United Kingdom
Presentation Type: Symposium
Location: Magpie (Cliff Lodge)
Date: Monday, August 2nd, 2004
Time: 3:15 PM