APPENDIX. 



The range of several trees as given in the text has been 

 extended by discoveries made during the summer of 1901, 

 but reported too late for incorporation in its proper place. 



Populus balsam if era, L., var. candicans, Gray. One of 

 the commonest and stateliest trees in the alluvium of the 

 Connecticut and the Cold rivers ; with negundo, river maple, 

 and white and slippery elm, forming a tall and dense forest 

 along the Connecticut at the foot of Fall mountain, and 

 opposite Bellows Falls. The densely pubescent petioles and 

 the ciliate margins of the broad cordate leaves at once dis- 

 tinguish this tree from the usually smaller but more common 

 P. balsamifera (" Some Trees and Shrubs of Western Cheshire 

 County, K H." Mr. M. L. Fernald, in Rhodora, III, 233). 



The above is the Populus candicans, Ait., of the text. 



Salix discolor, Muhl. There are many fine trees at Fort 

 Kent, Maine, one with trunk 13 inches in diameter. (M. L. 

 Fernald in lit., September, 1901.) 



Salix balsamifera, Barrett. A handsome tree at Fort 

 Kent, 25-30 feet high, with trunk 4-6 inches in diameter. 

 (M. L. Fernald in lit., September, 1901.) 



Crataegus Crus-Galli, L. Nantucket, Massachusetts. 

 Young trees were set out in 1830, enclosing an oblong of 

 about an acre and a half. The most flourishing of these 

 have obtained a height of about 30 feet and a trunk diameter 

 near the ground of 10-12 inches. Now established, probably 

 through the agency of birds, along swamps and upon hill- 

 slopes. (L. L. D.) 



Primus Americana, Marsh. One clump of small trees in 

 a thicket at Alstead Centre, N. H., has the characteristic 

 spherical fruit of this species. P. nigra, Ait., with oblong, 

 laterally flattened fruit, is abundant. {Rhodora, III, 234.) 



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