Abstract
ABSTRACT The Oxalis tuberosa alliance is a group of morphologically similar Oxalis species allied to the Andean tuber crop oca, O. tuberosa. Originally described by cytologists as a dozen species sharing a base chromosome number rare in Oxalis (x = 8), the alliance as defined here includes additional species for which cytological information is not yet available but which are supported as members on molecular and/or morphological grounds. The alliance includes members found in the Andean region from Venezuela to northern Argentina, with one species at high elevations in Central America. They occur from the high Andean steppes (paramo and puna) to the cloud forests of middle elevations and include both restricted endemics and variable widespread species complexes. Geographical and altitudinal distributions of members of the alliance and selected Oxalis species outside the alliance were compared with a combined phylogenetic analysis of DNA sequence data of ITS and ncpGS (chloroplast-expressed glutamine synt...
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