THE CAYUGA FLORA. 21 



tinguished from the true V. cor di folia, Michx., which scarcely ex- 

 tends to our latitude from the South and West, by the broad, round- 

 ed leaf-sinus, the narrow diaphragm separating the pith at the 

 nodes of the branches, (about %-%. mm. in thickness), the larger 

 thinner stipules (4-6 mm. long) while the seeds have a less distinct 

 raphe, and the flowering time is from 2 to 4 weeks earlier in the 

 same locality. 

 [V. cordifolia, Michx., is not certainly known within our limits, al- 

 though specimens with narrow leaf-sinus have been noticed on 

 Lockwood's Flats and elsewhere. They are all wanting, however, 

 in decisive characters connected with the diaphragms. It is in Sartw. 

 Herb. , at least so-named. ] 



79. Ampelopsis, Michx. 



170. A. quinquefolia, Michx. Virginia Creeper. (H. and C.) 

 Fences and in rich soil ; common. July. 



This vine covers the cliffs on the lake-shore, below McKinney's, 

 where it is especially beautiful in autumn. 



SAPINDACEiE. 



80. StaphylEA, Linn. 



171. *S. trifolia, L. Bladder-nut. (H. and C.) 

 Rich soils along streams and in rocky places ; scarce. May 15- 



June 15. 



Creek banks near Negundo Woods, and in a few localities be- 

 tween this and Ithaca. S. W. corner of Cayuga L. and in a few of 

 the small ravines along the Ledyard, Genoa and Lansing shores. 

 Frontenac Id. 



81. ^Esculus, Linn. 



172. * JE. Hippocastanum, L. Horse-chestnut. 



Escaped from cultivation, in Cascadilla ravine below the bridge. 

 On South Hill, and on Rocky Point, Cayuga L. May 15-30. 



82. Acer, Tourn. 



173. A. Pennsylvanicum, L. Striped Maple. (H. and C.) 

 Ravines and cold woods on the high hills ; frequent. May 20- 



June 20. 



174. A. spicatum, Lam. Mountain Maple. (H.andC.) 

 Ravines, woods and rocky hillsides ; frequent. May 20-June 20. 

 Specimen south side of Six Mile Cr. Narrows nearly 10 cm. in 



diameter. 



175. * A. saccharinum, Wang. Sugar Maple. (H. and C.) 

 Ravines and woods ; common. May 12-30. 



Large groves of these toward Cortland ; also a large element in 

 the woods of Dryden, Caroline, Danby, Enfield and Newfield. 



176. A. saccharinum, L, var. nigrum, Gray. Black Maple. (Seem- 

 ing like a distinct species.) (C. by Dr. Dwight.) 



Richer soil than the preceding ; not common. 



Toward Enfield (Jordan)*. Negundo Woods, Indian Spring, and at 

 the Corner-of-the-lake, Taughannock, Paine's Cr., and Big Gully 

 ravines and elsewhere, chiefly near the level of the lake. 



