Dryadoideae

Dryadoideae
	Dryas × suendermannii
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Rosales
Family:	Rosaceae
Subfamily:	Dryadoideae; (Lam. & DC.) Sweet
Genera
	Cercocarpus Kunth; Chamaebatia Benth.; Dryas L.; Purshia DC. ex Poir. (including Cowania)

The Dryadoideae subfamily of the Rosaceae consists of four genera.[1] These genera are unusual in the family Rosaceae because they all have the nitrogen-fixing bacteria called Frankia in their roots.[2] Dryadoideae plants are subshrubs, shrubs, or small trees. Their fruits are either an achene or an aggregate of achenes.[1]

Notes

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.

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[Potter-1] 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.