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Dryadoideae
Subfamily of flowering plants From Wikipedia, the free encyclopedia
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The subfamily Dryadoideae consists of four genera in the family Rosaceae,[1] all of which contain representative species with root nodules that host the nitrogen-fixing bacterium Frankia.[2] They are subshrubs, shrubs, or small trees with a base chromosome number of 9, whose fruits are either an achene or an aggregate of achenes.[1] It includes five genera (Dryas, Cercocarpus, Chamaebatia, Cowania, and Purshia), all of which except the first only occur in North America.
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Taxonomic history
The subfamily has at various times been separated as its own family (Dryadaceae), or as a tribe (Dryadeae) or subtribe (Dryadinae).[3]
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External links
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