52 
PURSH’S BUCKTHORN. 
Plate LIX. 
A branch of the natural size, a . The flower enlarged, b. The 
berries. 
PURSH’S BUCKTHORN. 
RHAMNUS Purshiantxs, (Decand.) inermis, erectus , foliis 
lato-ellipticis minute denticulato-serratis subtus pubescen - 
tibus nervis lateralibus obliquis lineatis , pedunculis ax- 
illaribus umbellatis Jloribusque pubescentibus , calyce 5- 
petalis minutis cucullatis. Hook. Flor. Bor. Amer., 
vol. 2. p. 123. t. 43. Decand. Prod., vol. 2. p. 25. 
Rhamnus alnifolius. Pursh, Flor. Am. Sept., vol. 1. p. 166. 
(non U Her i tier.) 
This is another species of Buckthorn which becomes 
a tree of 10 to 20 feet elevation, with a trunk of 9 
inches in diameter. It was discovered within the Rocky 
Mountain range on the banks of Salmon river, by Cap- 
tain Lewis; and it is of common occurrence on the 
borders of the Oregon, in the upland shady woods near 
the skirts of the prevailing Pine forests. Menzies also 
met with this tree near Nootka, on the North-West 
coast of America. It bears a strong resemblance to 
the R. Carolinianus , but the leaves are broader, shorter, 
and more decidedly serrated, and the berry is strongly 
3-lobed. 
The branches are round, dark brown and pubescent. 
The leaves are 3 to 5 inches long, petiolate, deciduous, 
but at length somewhat coriaceous, broadly elliptic, 
rounded or rarely somewhat acute at the base, obtuse 
or sometimes very shortly acuminate, the margin mi- 
nutely serrulate, the young leaves pubescent at length, 
