REPORT OF THE STATE BOTANIST 1902 119 



Acer nigrum Michx. 

 A. saccharinum var. nigrum T. & G. 

 Black sugar maple 

 Less common than the preceding species, which it closely re- 

 sembles, but from which it may easily be distinguished by the 

 bark and leaves. The sap is rich in sugar. April-May. 



Acer pennsylvanicum L. 

 Striped maple. Moosewood 

 Rocky woods and ravines. Common. June. 



Acer spicatum Lam. 

 Mountain maple 

 Along streams, in glens and ravines. Common. June. 



HIPPOCASTANACEAE 

 Aesculus hippocastanum L. 

 Horse-chestnut 

 Cultivated as a shade tree, and occasionally escapes from cul- 

 tivation. June. 



BALSAMINACEAE 

 Impatiens biflora Walt. 



I. fulva Nutt. 

 Spotted touch-me-not 

 Damp, shaded places. Common. July- September. 



Impatiens aurea Muhl. 

 I. pallida Nutt. 

 Pale touch-me-not 

 With the last but more abundant along the river. July-Sep- 

 i:ember. The mature capsules of both species burst at the slight- 

 est touch and expel the seeds with much force; hence the name 



"touch-me-not." 



RHAMNACEAE 



Rhamnus cathartica L. 

 Buckthorn 

 Planted for hedges, but it occasionally escapes to fields and 

 fence rows. June. 



Rhamnus alnifolia L'Her. 



Alder-leaved buckthorn 

 Swamps north of Barton. Infrequent. June. 



