Dryadoideae

Dryadoideae
	White arum ( Dryas octopetala )
Systematics
	Nuclear eudicotyledons
	Rosids
	Eurosiden I
Order :	Rose-like (rosales)
Family :	Rose family (Rosaceae)
Subfamily :	Dryadoideae
Scientific name
	Dryadoideae
	Juel

The Dryadoideae are a subfamily of the rose family (Rosaceae) and comprises four genera.

The representatives of the Dryadoideae are dwarf shrubs, shrubs or trees. The leaves are simple, composed of Chamaebatia . Stipules are present. The flower cup (hypanthium) is not fused with the gynoeceum . There is one carpel or (in Cowania and Dryas ) four or many. The fruits are achenes .

Cyanogenic glycosides are present, sorbitol occurs in traces. The basic chromosome number is x = 9, all representatives are diploid (2n = 18).

The species operate symbiotic nitrogen fixation.

Systematics

The Dryadoideae are one of the three subfamilies of the rose family , the relationship between the subfamilies has not yet been clarified. The subfamily was long run as the Dryadeae tribe, by Potter et al. In 2007, however, raised to the rank of subfamily. It comprises four genera:

Silberwurzen ( Dryas )
Chamaebatia
Purshia (including Cowania )
Cercocarpus

supporting documents

D. Potter, T. Eriksson, RC Evans, S. Oh, JEE Smedmark, DR Morgan, M. Kerr, KR Robertson, M. Arsenault, TA Dickinson, CS Campbell: Phylogeny and classification of Rosaceae . Plant Systematics and Evolution, Volume 266, 2007, pp. 5-43. doi : 10.1007 / s00606-007-0539-9

Individual evidence

^ TA Dickinson, E. Lo, N. Talent: Polyploidy, reproductive biology, and Rosaceae: understanding evolution and making classifications. Plant Systematics and Evolution, Volume 266, 2007, pp. 59-78. doi : 10.1007 / s00606-007-0541-2

Web links

Commons : Dryadoideae - collection of images, videos and audio files

[1] TA Dickinson, E. Lo, N. Talent: Polyploidy, reproductive biology, and Rosaceae: understanding evolution and making classifications. Plant Systematics and Evolution, Volume 266, 2007, pp. 59-78. doi : 10.1007 / s00606-007-0541-2