Subfamily
Dryadoideae
Cercocarpus betuloides. Photo: (c) Steve Matson, some rights reserved (CC BY-NC)
The Dryadoideae subfamily of the Rosaceae consists of four genera, all of which share root nodules that host the nitrogen-fixing bacterium Frankia. 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.
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