372 ICOSANDR1A MONOGVNIA. 



POLYGNIA. 



232. ROSA. Calyx urceolate, fleshy, contracted at the orifice ; border 

 5-cleft ; pet. 5 ; seeds numerous, hispid, attached to the interior side 

 of the calyx. 



233. RUB US. Calyx 5-cleft, inferior; pet. 5 ; fruit composed of many 

 1 -seeded juicy acines, on a dry receptacle. 



234. DALIBARDA. Calyx inferior, 8-cleft, spreading ; styles 5 8, 

 long and deciduous ; seeds dry. 



235. GEUM. Calyx 10-cleft, inferior ; the alternate segments smaller ; 

 pet. 5 ; seeds awned, with the awn naked or bearded, mostly genicu- 

 late. 



236. POTENTILLA. Calyx flat, 10-cleft, (rarely 8 or 12-cleft;) seg- 

 ments alternately smaller ; pet. 5, (rarely 4 ;) seeds or acines subo- 

 vate ; mostly rugose, immerged in a common receptacle, which is 

 juiceless or spongy, more or less hemispherical. 



237. FRAGRARIA. Calyx 10-cleft ; pet. 5 ; acines naked, fixed on a 

 large, pulpy, deciduous receptacle. 



ICOSANDRIA. 

 MONOGYNIA. 



species. 224. CACTUS. Indian Fig, &c. 



C. opuntia : articulately proliferous ; articulations compressed, ovate ; 



spines setaceous ; fruit succulent, smooth. 

 HAB. Rocks and sandy fields. June July ty; procumb., leajl., 



fleshy ; Jlower yet. 



225. PRUNUS. Plum and Cherry. 



* Flowers racemose. 



V. virginiana, : racemes erect, elongated ; leaves deciduous, oval-ob- 

 long, acuminate, shining above, serrate, smooth on both sides ; peti- 

 oles with 2 1 glands. 



HAB. Woods. May. A large tree ; racem. simp. ; Jlower white ; 

 drupe black. 



P. serotina : racemes loose, at length pendulous ; leaves deciduous, 

 ovate, with a short acumination, doubly and very acutely serrate 

 midrib bearded on each side towards the base ; petiole with 2 

 glands. 



