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Dryadoideae
The Dryadoideae subfamily of the Rosaceae consists of four genera,〔Potter, D., et al. (2007). Phylogeny and classification of Rosaceae. ''Plant Systematics and Evolution''. 266(1–2): 5–43.〕 all of which share root nodules that host the nitrogen-fixing bacterium ''Frankia''.〔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.〕 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.〔 ==Taxonomic history== The subfamily has at various times been separated as its own family (Dryadaceae), or as a tribe (Dryadeae) or subtribe (Dryadinae).〔(【引用サイトリンク】title=Indices Nominum Supragenericorum Plantarum Vascularium – RA-RZ )〕
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