ORDEK 122. THE WILLOWORTS. 299 



1 B. excel'sjor. Yellow Birch. Tree 50-80f. Fertile amenta erect, oblong, 1 inch 



in length, erect, sterile 2-4', pendulous, clustered, e. N. 

 2 B. lenta. Black B. Svttet B. Tree 40-60f. Fertile aments erect, oval, obtuse, 



stalked; sterile 2-3', pendulous. Inner bark sweet-spicy. M. N. 

 8 B. ni'gra. Red Birch. Tree 30-50f. Leaves rhombic-ovate, acute at both ends, 

 obscurely lobed. Fertile anients sessile, ovoid. M. S. W. 



4 B. populifo'lia. White B. Tree 30-40f. Leaves triangular, long-pointed 



smooth, unequally serrate. Sterile aments long, pendulous. N. 



5 B. papyra'cea. Canoe Birch. Tree 50-70f. Leaves ovate, pointed, doubly- 



serrate. All the aments nodding. Hills and mountains. N. 



6 B. pum'ila. Dwarf B. Shrub erect, 2- 6f. Branches warty. Leaves obovate, ob- 



tusely serrate above. Fertile arnents cylindric. Mountains. N. 



7 B. na'na. Tiny B. Shrub low, trailing, smooth. Leaves round, crenate. Scalce 



of fertile arnent deeply 3-parted. 8-12'. Mountains. N.-H. 



ORDER CXXII. SALICACE.E. The Willoworts. 



Trees or shnibs, with simple leaves, and stipules usually present; 

 flowers dioecious, naked, both kinds in aments, each with a bract ; 

 ovary 1 or 2-celled, with 2 short styles; capsule many-seeded; 

 seeds with a coma and no albumen. 



687 634 



fig. 634. A fertile flower of a Willow, consisting of a pistil and a bract Fig. 635. Sterile 

 flower, 2 stamens and a .bract Fig. 636. A sterile flower of Balm-of-Gilead (Popidus candl- 

 cans); many stamens, fig. 637. A fertile flower, consisting of a fringed scale, a calyx holding 

 a double ovary. 



Analysis of the Genera. 



S Amenta cylindric, bracts entire. Stamens 2 or more. Capsule 1-celled, 2- 

 valved, the seeds very small, clothed with silky hairs. Trees or shrubs. 

 Leaves often long and narrow. (Figs. 12, 17, 88.) We have about 27 spe- 

 cies. Willow. Ofier. SA_ x 

 $ Aments cylindric, bracts fringed. Stamens 8 or more. Capsule 2-celled, 2- 

 valved. Calyx an entire cup. Bude varnished with a fragrant resin. 

 Leaves broad, lar#e. Trees. Poplar. Atp. Porvun 



