Dryas. ROSACEiE. 419 



/. c. Spiraea stipulata, W'dld.! enum. 1. p. 542. S. stipulacea, Pursh, fl. 

 I. p. 343; Bart. I. c. 1. t. G ; Camh. in ami. sci. nat. I. p. 387, t. 28. 



Western Stares ! to Arkansas! and Louisiana ! Western part of Pennsyl- 

 vania ! and New York (not east of the Allei^hany Mountains), and in the 

 mountains of the Southern States to Ahihama ! June. — Radicle and lower 

 leaves almost piimatifid. Peduncles few-llowered. 



Tkibe II. DRYADEiE. 

 PotontilleoB &. Sanguisorbcfe, Juss. 



Calyx valvate or often imbricate in austivation. Stamens some- 

 times definite. Carpels (achenia) 1-scedcd and indchiscent, either 

 few or solitary, or numerous and then collected into a head on a 

 conical or hemispherical torus : ovules solitary, rarely 2, suspended 

 or ascending (sometimes amphitropous) : styles lateral or termi- 

 nal. — Herbs, shrubs, or rarely trees. 



The suborder or tribe Sanguisorbcje of Jussieu, De Candolle, Lindlcy, &c. 

 appears to comprise genera that are not very nearly related, and is circuniscribed 

 by no constant character. The indurated calyx-tube contracted at the orifice is 

 perhaps the best character, but this does not well apply to Alciiemilla, Adenos- 

 toma, or Cercocarpus. Poterium and Cliftbrtia only have unisexual flowers. 

 Alchemilla has sometimes four ovaries, and Sibbaklia, Chamasrhodos, Wald- 

 Bteinia, and Dalibarda have often no greater number. If tlie few and definite 

 stamens be assumed as the leading character of the tribe, Poterium and CliSbrtia 

 would be excluded, while Horkclia, Sibbaldia, and ChamtBrhodos would be in. 

 eluded. If the absence of petals be deemed the most important character, we 

 must include Cercocarpus and exclude Purshia, while Agrimonia, Aremonia, and 

 Adenostoiaa (in which the calyx-tube is indurated, and the ovaries one or two,) 

 will be rejected from the tribe. The division wo propose rests upon more im- 

 portant and constant, although less obvious, characters, and appears to produce 

 a more natural arrangement. — It appears to us that the genus Cliffortia is incor- 

 reclly described. In the few species that we have examined, the seed is certainly 

 suspended, and the radicle superior. 



Series 1. Seed attached to the extremity of (he cavity of the ovary 

 farthest from the insertion of the style. Radicle inferior. 



Subtribe 1. Eudryade^:. — Calyx campanulate or turbinate, or rather 

 flat, valvate in aestivation. Stamens numerous. Carpels numerous, dry: 

 stj'le terminal. Seed erect. Radicle inferior. — Herbs or sometimes shrubby 

 plants. Flowers perfect.* 



7. DRYAS. Linn. ; Lam. ill. t. 443 ; Gcertn. fr. i. 74. 



Calyx concave at the base, 8-9-parted ; the segments nearly equal and in 

 a single series. Petals 8-9, large. Stamens numerous. Achenia nume- 

 rous, aggregated ou the dry receptacle, caudate with the very long persistent 



• Coluria, R. Br. and Cowania, Don., also belong to this section. 



