Abstract
Lamprothyrsus, a ditypic arundinoid, South American grass genus, consists predominantly of populations of exclusively female plants in which seeds are set by autonomous apospory. Lamprothyrsus peruvianus is a high polyploid-2n = ca. 136, the highest chromosome number so far recorded in the Arundineae. The hypothesis favored here for the evolution of apospory involves a mutation for apomixis spreading through to fixation in an old, dioecious, polyploid genus resulting in generations solely of female plants. This proposal is consistent with reproductive pathways already recognized in some aposporous species of the related genus Cortaderia, and in some diplosporous species of Poa and Calamagrostis (...)
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