The Dryadoideae subfamily of the Rosaceae consists of four genera. These genera are unusual in the family Rosaceae because they all have the nitrogen-fixing bacteria called Frankia in their roots. Dryadoideae plants are subshrubs, shrubs, or small trees. Their fruits are either an achene or an aggregate of achenes.
|Dryas × suendermannii|
- Potter, D., et al. (2007). Phylogeny and classification of Rosaceae. Plant Systematics and Evolution. 266(1–2): 5–43.
- 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.