APPENDIX. 33 7 



XI. CLASS ICOSANDRIA. 



43. Prunus *mcana, L. v. Schw. 



Mr. Say calls this shrub a cherry, found at the Lake of 

 the Woods, and from a vestige of an umbell, there is lit- 

 tle doubt that it belongs to the genus Prunus, although 

 there is neither flower nor fruit. If so, it is doubtless an 

 undescribed species. 



The young branches are very red and angularly grooved; 

 the older gray and verrucose. The leaves alternate, on 

 short petioles, elliptically acuminate, finely and subdistant- 

 ly serrate above, and attenuated into the petiole below, 

 with the margin somewhat revolute. The upper surface 

 smooth and shining, the under pinnately nervose, and re- 

 markably glaucous, a little tomentose. Two large glan- 

 dules in the axill of each leaf. The traces of a few flower- 

 ed umbell appear at the commencement of the young 

 branches of the year. 



Hah. Islands in the Lake of the Woods. 



44. Aronia sayiguinea, Nutt. p. 306. 

 Pyrus sanguinea, Pursh, p. 340. 



Destitute of flowers or fruit ; but doubtless this Cana- 

 dian tree. 



Hub. Lake of the Woods. 



45. Crataegus elliptica, Pursh, p. 337. 

 Not uncommon. 



Hab. near Pembina and Lake of the Woods. 



46. Crataegus *flexuosa, L. v. Schw. 



Flower and fruit are wanting, but there can be no doubt 

 of the genus from the habit. The leaves greatly resemble 

 those of C. populifolia, although they cannot be said to be 

 at all cordate at base. Perhaps it may be the C. populifo-. 

 lia of Walter, see Elliott, Sketch, I. p. 553. But the re- 



