36/ 



MONOECIA.— POLYANDRIA. %&r 



HAB. Woods. A large tree; bark smooth ; fruit 

 muricate ; leav. ribbed. 

 i. F. sylvatica ; leaves ovate, acuminate, slightly den- 

 tate, ciliate on the margin, acute at the base ; nut 

 ovate, triquetrous, obtuse, but mucronate. 



HAB. Woods. A large tree with num. branch. ; 

 leav. bright green. 



553. CASTANEA. Chesnut. Corylacea>.. 



1. C.vesca,^. americana: leaves lanceolate, acuminate, 

 mucronately serrate, smooth on both sides. 

 HAB. Woods. June. A large tree ; trunk straight ; 

 leav. large; sterile spik.Jilif. 

 1. C. pumila : leaves oblong, acute, mucronately ser- 

 rate, tomentose and hoary beneath. 

 HAB. Sandy woods. A shrub or small tree; fruit 

 small, very sweet. 



554. BETULA. Birch. Salicinm. 



1. B. populifolia : leaves deltoid, long-acuminate, un 



equally serrate, very smooth ; petioles smooth ; 

 strobile pedunculate; scales with roundish lateral 

 lobes. 

 HAB, Rocky woods and mountains. May. A smalt 

 or middle sized tree. 



2. B. excelsa : leaves ovate, acute, serrate ; petioles 



pubescent, shorter than the peduncle ; strobile 

 ovate, erect; scales with rounded lateral lobes. 

 HAB. Woods. A large tree ; bark smooth and yel- 

 lowish, somewhat fragrant. 

 i. B. nigra : leaves rhornbic-ovatc, doubly serrate, 

 acute, pubescent beneath, entire at the base ; stro- 

 bile ovate ; scales villous, with the segments linear 

 and equal. 

 HAB. Banks of rivers. A middle sized tree ; leav. 

 acutely serrate. 

 4. B. papyracea : leaves ovate, acuminate, doubly ser 

 rate, the veins beneath hairy ; peduncles smooth ; 

 strobile nodding, pedunculate ; scales with the la 

 teral lobes short and suborbicular. 

 HAB. Woods. A large tree; cuticle tough, com- 

 posed of numerous membranaceous layers. 

 H h 



