Hitchcock — Opening of Buds of Some Woody Plants. 135 



Vitis riparia, Mx. Buds rupturing the bark sometimes 

 two superposed. Each leaf protected by its two hairy stip- 

 ular scales. Vernation straight but inclosing the remainder 

 of the bud. Apr. 1st. 



Oissus Ampelopsis, Pers. Much as in V. riparia, but stip- 

 ules and young leaves thinner and nearly smooth. May 3d. 



Ampelopsis quinquefolia, Mx. Buds one to three, rupturing 

 the epidermis. Scales four. Leaves enclosed by their en- 

 larged stipules. First leaf perfect, 5-divided, lobes condupli- 

 cate, arranged almost in a circle. Apr. 30th. 



^iEsculus arguta, Buckley. Buds swelling considerably 

 before opening. Scales opposite, six to ten pairs, the inner 

 successively larger and thinner, but no transition to leaves. 

 First leaves with five leaflets. Leaflets involute. Apr. 9th. 



Acer dasycarpum, Ehrh. Scales opposite, four pairs ; the 

 inner pairs ciliate-margined. Vernation plicate. Apr. 21st. 



Negundo aceroides, Moench. One of the first of the woody 

 plants to show signs of pushing out leaves in spring. Scales 

 opposite, four pairs. First pair with a roundish point ; second 

 pair about twice as long, apiculate; third pair about, twice as 

 long as the second, roundish at apex ; fourth pair somewhat 

 longer than the third, three-lobed at apex. First pair of 

 leaves with three leaflets. Leaflets conduplicate, side by 

 side, the margins of opposite leaves touching. Apr. 8th. 



Staphylea trifolia, L. Scales opposite, two pairs. First 

 set of stipules more than half as long as leaf, succeeding ones 

 shorter. Leaflets involute, side by side. Apr. 22d. 



Rhus Toxicodendron, L. Buds naked or occasionally with 

 one or two scales. Leaflets conduplicate. May 5th. 



Hints Canadensis, Marsh. Buds naked, the first leaf be- 

 coming normal in size and shape. As all the internodes elon- 

 gate there is but one ring separating the growth of successive 

 years. (M. glabra also has naked buds, with the first leaves 

 very felty-pubescent.) Leaves plicate. May 5th. 



Amorpha fruticosa, L. Buds two, superposed, either or 

 both developing. Scales several. First leaf pinnate, some- 

 times imperfect. Stipules lanceolate, acuminate. Leaflets 

 conduplicate, side by side. May 6th. 



Cercis Canadensis, L. Scales two. First leaf well-formed, 



