Order 122.— THE WILLOWORTS. 



290 



1 B, escel'sior. Yellow Birch. Tree 50-80f. Fertile aments erect, oblong, 1 inch 

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

 2 B. lenta. Black B. Sweet 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 S0-50f. Leaves rhombic-ovate, acute at both eudn, 

 obscurely lobed. Fertile aments 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.^nm'ila.. Diva?f B. Shrub erect, 2-6f. Branches warty. Leaves obovate, ob- 



tusely serrate above. Fertile aments eylindric. Mountains. N. 



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



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



Order CXXII. SALICACEJE. The Willoworts. 



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

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

 ovaj^y 1 or 2-celled, with 2 short styles; capsule many-seeded; 

 seeds with a coma and no albumen. 



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 (Populus candi- 

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

 ft double ovary. 



Analysis of the Genera. 



S Aments eylindric, bracts entire. Stamens 2 or more. Capsule 1-celk-d, i"- 

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

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

 cies. Willow. Osier. Salia 



§ Aments eylindric, bracts fringed. Stamens 8 or more. Capsule 2-celled, 2- 

 valved. Calyx an entire cup. Buds varnished with a fragrant resfn. 

 Leaves broad, large. Trees. Poplar. Aspen. PoPOLca 



