The Dryadoideae subfamily of the Rosaceae consists of four genera,[1] all of which share root nodules that host the nitrogen-fixing bacterium Frankia.[2] They are sub-shrubs, shrubs, or small trees with a base chromosome number of 9, whose fruits are either an achene or an aggregate of achenes.[1]

Taxonomic history[edit]

The subfamily has at various times been separated as its own family (Dryadaceae), or as a tribe (Dryadeae) or subtribe (Dryadinae).[3]


  1. ^ a b Potter, D., et al. (2007). Phylogeny and classification of Rosaceae. Plant Systematics and Evolution. 266(1–2): 5–43.
  2. ^ Swensen, S.M.; Mullin, B.C. (1997). The impact of molecular systematics on hypotheses for the evolution of root nodule symbioses and implications for expanding symbioses to new host plant genera. Plant and Soil. 194: 185–192.
  3. ^ J. L. Reveal. "Indices Nominum Supragenericorum Plantarum Vascularium – RA-RZ". 
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