823 DICOTYLEDONOUS PLANTS. 



23. & alba Linn. : leaves lanceolate, acuminate, serrate, silky on 

 both sides ; lower serratures glandular ; stipules obsolete ; aments ap- 

 pearing with the leaves, elongated ; scales elliptic-lanceolate, of the 

 same colour, pubescent ; germs subsessile, ovate-oblong ; style short ; 

 stigmas 2-parted, thick. 



HAB. Road sides and river banks. April r May. T?. A tall tree, 

 introduced from Europe. Pursh. 



24. S. vitellina Linn. : leaves lanceolate, acuminate, with thickened 

 serratures, smooth above, paler and somewhat silky beneath ; stipules 

 none ; aments appearing with the leaves, cylindric ; scales ovate-lan- 

 ceolate, externally pubescent ; germs sessile, ovate lanceolate, smooth; 

 tigmas subsessile, 2-lobed. 



HAB. Road sides and about farms. May. J?. A middle-sized 

 tree, introduced from Europe. 



25. & decipiens Hoff. : leaves lanceolate, acuminate^ serrate, very 

 smooth, same colour on both sides ; petioles glandular toothed ; sti- 

 pules roundish ; aments appearing with the leaves ; scales obovate, 

 villous ; germs subsessile, lanceolate, smooth ; stigmas sessile, 2-part- 

 ed. S.fragilis Linn 5>. russeliana Smith. 



HAB. Road sides, &c. Introduced into the N. S. ? Native in 

 Arc. Amer. Richardson. April, May. *>. A small tree with 

 very brittle branches. 



26. S. ambigua Pursh : leaves lanceolate, acuminate, same colour on 

 both sides, smooth, glandular, serrate ; aments appearing with the 

 leaves ; nectary large ; its lobes lanceolate, smooth, toothed at the 

 summit ; terminal flowers triandrous. 



HAB. Low grounds. N. Y. and N. J. April. *>. The only 

 authority for this as an American species, I believe, is Pursh, 

 who says it resemble* in leaves and habit S. riicllina, and in 

 fructification S. decipiens. Sprengel considers it a variety of S. 

 triandra of Linnceus. 



2. POPULUS. Linn. 



Dioecious. JJment cylindrical; scales lacerated. STE- 

 RILE FL. Anthers 8 30, arising from a turbinate, oblique, 

 entire, single perianth. FERTILE FL. Perianth turbinate, 

 entire. Stigmas 4. Capsule superior, 2-celled, 2-valved, 

 many-seeded. Seeds cornose. Dioecia. Octandria. 



1. P. balsamtfera Linn. : leaves ovate, acuminate, appressed-serrate, 

 white and reticular-Veined beneath ; T>uds resinous. 



HAB. Can. and N. to the Arctic Sea ; abundant. Introduced 

 into N. Y< March. *?. A tree from 7080 feet high, the 

 young buds of which are covered with an odoriferous balsam. 



Balsam Poplar. Tacamahac. 



2. P. candicans Ait. : leaves cordate, ovate, acuminate, obtusely and 

 unequally serrate, white beneath, somewhat 3-nerved, reticular-vein- 



