326 



SALICACEAE (WILLOW FAMILY) 



6GO. S. humilis. 



aments ovoid-cylindric, at first 1-2 cm. long, in fruit broad and loose from the 

 lengthening of the pedicels, becoming 2-4 cm. long ; capsule rostrate from an 

 ovoid base, blunt. Low shrub of damp soil, N. B. to the Great Lake region 

 and Man., s. to Tenn. FIG. 659. 



= = Mature leaves pubescent at least beneath, 

 a. Aments sessile on the old wood, naked at base, appearing before the leaves. 



1. Leaves dull, grayish-tomentose, undulate-crenate or subentire ; capsules slen- 



der-beaked. 



21. S. humilis Marsh. (PRAIRIE W.) Leaves oblanceolate or oblong-lan- 

 ceolate, rarely obovate, 5-15 cm. long, above downy becoming glabrate, beneath 

 glaucous, rugose-veined and softly tomentose, the margin revo- 

 lute, undulate-entire ; stipules medium-sized, semi-ovate, entire 

 or oftener toothed ; petioles distinct ; aments ovoid or ellipsoid, 

 often recurved, 1.5-4 cm. long. Dry plains and barrens, Nfd. 

 to Minn, and N. C. A shrub, 1-3 m. high, vary- 

 ing much in the size and shape of the leaves. 

 FIG. 660. 



Var. rigidiiiscula Anders. Leaves narrowly 

 oblanceolate to lance-oblong, 0.5-1 dm. long, rigid, 

 strongly ascending, very rugose and glabrescent 

 beneath. O. to Ga. and Kan. Shrub or small 

 tree. 



22. S. tristis Ait. (DWARF GRAY W.) Leaves 

 similar to those of the last, small (1-5 cm. long), 

 crowded, linear-oblanceolate, tapering to a very short petiole ; 661 s 

 stipules minute, deciduous; aments very small, globular or ovoid, 

 1-1.5 cm. long in fruit. Sandy plains or on the borders of hillside thickets, 

 N. E. to Minn, and southw., mostly near the coast. A tufted shrub, 0.5m. 

 high. FIG. 661. 



2. Leaves lustrous beneath with minute silky pubescence, fine-serrate ; capsules 



blunt. 



23. S. sericea Marsh. (SILKY W.) Leaves narrowly lanceolate, 0.4-1 dm. 

 long, 1-2.5 cm. broad, finely serrate, at first (principally beneath) very silky, 

 turning black in drying ; stipules narrow, deciduous ; aments nar- 

 rowly cylindrical, the fertile densely flowered, in maturity 2-3 cm. 

 long ; capsule sericeous, ovoid-oblong, round-tipped, its pedicel 

 about equaling the short-hairy scale and twice exceeding the gland. 

 Large shrub of wet places, N. B. to N. C. and Mich. FIG. 662. 



b. Aments leafy-bracted at base, appearing with the leaves. 



1. Leaves strongly rugose in age, grayish-pubes- 

 cent or glabrate beneath; capsule gray-pubes- 

 cent, its pedicel several times exceeding the 

 subtending scale. 



24. S. rostrata Kichards. Leaves obovate to 

 l. s. sericea. elliptic-lanceolate, 3-10 cm. long, acute or acumi- 

 nate, dull green and minutely downy above, serrate, 

 crenate, or subentire, thin, becoming rigid; stipules when pres- 

 ent semi-cordate, toothed, acute ; sterile aments narrowed at 

 base, the fertile loosely flowered, 2-6 cm. long ; capsules tapering 

 to a very long slender beak ; pedicels thread-like, much exceeding 

 the pale rose-tipped linear thinly villous scales; style scarcely 

 any ; stigma lobes entire or deeply parted. (S. Sebbiana Sarg.) 

 Shrub or small tree of moist or dry ground, Nfd. to Alaska, 

 B. to N. J., Pa., 111., la., etc. FIG. 663. 



