TfcEES NOT GENERALLY KNOWN. 283 



of dioecious, one-petaled flowers. Fruit an oranged-colored edi- 

 ble berry, with many seeds imbedded in a pulp. Cultivated in 

 Japan for ornament and its edible fruit. Propagated readily 

 from seed and cuttings of the roots. Thrives splendidly in the 

 Southern States, but I am not fully satisfied of its hardiness in 

 the North, although it is reported to have withstood the cold of 

 winter in the neighborhood of Boston, while unprotected speci- 

 mens have been winter-killed in the suburbs of New York City. 



Phellodendron Amnrense, Rupr. Chinese Cork Tree. A medium- 

 sized tree from China. It is closely allied to the Prickly Ash 

 (Xanthoxylum), having large pinnate leaves, which become 

 bright red in autumn, remaining on the tree quite late. Another 

 species is found in Japan, the P. Japonicum. Both species are 

 in cultivation in this country, and are apparently quite hardy, 

 at least they have not been injured by cold in my grounds. 



Pterocarya fraxinifolia. Spach. A medium-sized, but rapid- 

 growing tree from Russia and Asia. It is closely related to the 

 Walnuts, and De Lamarck describes it under the name of Jug- 

 lans fraxinifolia or Ash-leaved Walnut. The Pterocaryas are 

 moderately hardy in our Northern States, two species having 

 been introduced, the above and P. stenoptera, Cas. DC., but 

 the latter is usually mentioned in nurserymen's catalogues un- 

 der the name of P. Icevigata. 



ADDITIONS AND CORRECTIONS. 



Cercoearpus, HBK. Mountain Mahogany. Shrubs or small 

 trees belonging to the RosacecB or Rose Family, only four or 

 five species in the genus, all inhabiting the interior of North 

 America, and only one large enough to be classed among trees. 



C. ledifolius, Nutt. Mountain Mahogany. Leaves thick, 

 single, evergreen, narrow lanceolate, with more or less 

 revolute margins. Flowers small, without petals. Fruit 

 roundish, long, hairy, included in the enlarged calyx tube. 

 Seeds linear, with thin wings. A small tree or shrub, but some- 

 times thirty to fifty feet high. Wood very hard, dark ma- 

 hogany-colored, rather brittle, and usually too small to be of 

 value. Native of Oregon, Idaho, Utah, and on the slopes of the 

 Sierra Nevada. 



C. parvifolins. Nutt. Leaves more or less silky, and not so 

 thick as the last, and broader or cuneate-obovate, one to one 



