514 FLORA OF TEXAS. 



SALIX, Tourn. Willow. 



Bracts of the aments entire ; flowers each with 1-2 small 

 glands; stamens 2-6, free, or their filaments cohering at 

 the base; stigmas short, 2-lobed ; leaves commonly narrow, 

 short-petioled ; stipules scale-like and deciduous, or leafy 

 and persistent ; luds covered with a single scale; aments 

 mostly erect, appearing with or before the leaves. 



Aments large cylindrical, on leafy peduncles or branchlets, appearing with the 

 leaves ; ovaries smooth and stalked. 



S. NIGRA, Marshall. Leaves lanceolate, acute at each 

 end, serrate, petioled, pubescent when young, becoming 

 smoothish and green on both surfaces ; stipules small and 

 caducous, or sometimes lunate, toothed, and persistent; 

 ameyits elongated, the fertile ones slender, loose-flowered ; 

 tracts deciduous ; stamens 3-6, hairy below ; capsule ovate, 

 acuminate, pointed by the conspicuous style. (S. Hous- 

 toniana, Pursh.) Swamps and muddy banks of rivers. A 

 slirul) or small tree, with brittle branches; leaves 2-3' 

 long, sometimes pubescent at maturity, like the branch- 

 lets; fertile aments 3-4' long. 



The Weeping Willow (S. Babylonica, Tourn.), and the 

 Yellow Willow or Golden Osier (S. vitellina. Smith), 

 are introduced species. 



POPULUS, Tourn. Cottonwood; Poplar; Aspen. 



Bracts of the aments toothed or lobed; floivers from an 

 oblique cup-shaped disk ; stamens few or numerous, "with 

 the filaments free; stigmas elongated, 2-parted. — Trees; 

 leaves ovate or roundish, on long and often laterally com- 

 l")ressed petioles ; huds covered with imbricated, often resin- 

 ous-coated scales; aments slender, drooping, appearing 

 before the leaves. 



P. ANGULATA, Ait. Branches thick, smooth, and sharply 



