Hybridization ofPyrola chlorantha(Ericaceae) in North America

摘要

A distinctive hybrid betweenP.chloranthaandP.minoris reported from specimens collected by John Richardson at Great Bear River, Northwest Territories, during the second voyage of the Franklin Expedition to British Northwest America. The intermediacy of some collections ofP.chloranthaandP.pictaand the presence of floral and pollen abnormalities are interpreted as evidence of hybridization between these morphologically similar species. Pollen tetrad diameters and two-dimensional paper chromatographic patterns of leaf flavonols serve as useful criteria in characterizing these two species.