616 



MONOECIA POLYANDRfA 



1 



BETULA. Gen. Pl. 1419. 





i %-f 



1 



Ma s c u 1 1. Amentum 



imbricatum, squamis 



Ca- 



ster He Jlorets 



A- 



peltatis, trifloris. 



lyx squama. Corolla Calyx ^ scale. 



merit imbricate, scales 

 peltate, three-flowered. 



Coral' 



0. 



Stamina 10 



12. 



FoemineL Amentum 



imbricatum. 

 squama bi flora. 



Calyx 

 Co- 



rolla 0. Semen 1, ala- 



tum. 



12. 

 A- 



la 0. Stamens 10 

 Fertile Jlorets. 

 merit imbricate. Calyx 

 a scale 2-flowered. Co- 

 rolla 0. Seed J, wing- 

 ed. 



1. Nigra. 



Lin. 



B. foliis rhombeo- 

 ovatis, diiplicato-serra- 

 tis, acutis, sublus pube- 

 scentibus, basi integris; 

 amentis foemineis ova- 



tis. 



squamis 



villosis, 



laciniis linearibus ae 

 qualibus. 



Leaves rliomboidal, 

 ovate, doubly serrate, 

 acute, pubescent under- 

 neath, entire at base; 

 fertile aments ovate, 

 the scales villous 

 segments hnear 



the 



13, "J 



e qu al 



Sp. pi. 4. p. 464. Purshj 2. p. 621, 



B. Alba, Walt, p, 231? 



B. Lanulosa, Mich, 2. p, 181. 



B. Rubra, Mich. arb. for. 2. p. 142. 



A tree growing commonly 30 



Nutt. 2. p. 218. 



2 feet in diameter, 



_ -40 feet, and from 1 



though sometimes attaining a much greater size; the trunk covered witn a 

 smooth scaly bark, the branches long and flexible. Leaves on short peti- 

 oles, ovate, acuminate, somewhat angled and acutely serrate, very pubescent 

 underneath when young. Fruit in small oval aments, scales 3-cleft villous^ 

 the segments equal. 



Grows along the margins of rivers whenever the soil is v,'^X and snnn}^ 

 The wood, I believe, is very little used in the Southern Stntes. 



Flowers March. 



