SALICACEAE (WILLOW FAMILY) 



323 



- 



S. longifolia. 





Leaves linear- or oblong-lanceolate, short-acuminate, remotely denticulate 

 with projecting teeth. 



10. S. Iongif61ia Muhl. (SAND BAR W.) Leaves 3-15 cm. 

 long, 4-15 mm. broad, tapering at each end, nearly sessile, more 

 or less silky when young, at length smooth and green both sides, 

 with 2-3 teeth to each cm. of margin ; stipules small, lanceolate, 

 deciduous ; aments slender-cylindric, often clustered at the ends 

 of the branchlets ; capsule short-pediceled, blunt ; stigmas large, 

 sessile. (8. fluviatilis auth., not Nutt. ; S. interior Rowlee.) 

 A shrub or small tree, spreading extensively in alluvial deposits 

 and forming dense clumps, e. Que. to Man., s. to Del. and La. ; 

 common and characteristic inland. FIG. 649. 



2. Aments lateral or terminal, with or without bracts ; scales 

 persistent, colored at the tip ; stamens 2 (usually 1 in no. 17). 



* Filaments glabrous and distinct. 



-- Capsules glabrous. 

 w- Erect or ascending shrubs or small trees. 



= Leaves lanceolate to ovate, acute or acuminate, serrate ; sterile aments very 

 silky, with a few bracts at base, becoming 2-4 cm. long, the fertile in fruit 

 2.5-10 cm. long, 

 a. Leaves glabrous or quickly glabrate ; capsules distinctly pediceled. 



1. Stipules persistent, usually conspicuous. 

 O Leaves dull above, the young pubescent with early -deciduous soft hairs. 



+ Fruiting aments 2.5-6 cm. long ; mature capsule 4-7 mm. long. 

 11. S. cordata Muhl. Twigs glabrous or soon glabrate; 

 leaves oblong-lanceolate or narrower, on the flowering 

 branches often tapering at base, sharply serrulate, green both 

 sides or slightly paler beneath, on vigorous shoots mostly 

 rounded, truncate, or cordate at base, not turning black in 

 drying ; stipules reniform or ovate, serrate, usually large ; 

 aments rather slender ; capsules green- 

 ish or rufescent. In wet places, along 

 streams, etc. ; a widely distributed 

 shrub, freely hybridizing. FIG. 650. 

 Var. MYRICOIDES (Muhl.) Carey. Twigs 

 cinereous or canescent with permanent 

 pubescence ; leaves elongate, even those 

 of the most vigorous shoots tapering 

 and rather acute at base, glaucous or 

 glaucescent beneath and sparsely ap- 

 pressed-hairy ; stipules small, ovate, 

 pointed ; capsules often silky when 

 young, becoming glabrate, short-pedi- 

 celed ; twigs brittle at base. Mass, 

 to Wise, and Kan. Perhaps a hybrid with S. sericea. 



+ + Fruiting aments 6-10 cm. long ; mature capsules 



8-10 mm. long. 



12. S. missouri6nsis Bebb. Tree or large shrub (3-16 

 m. high), with black bark and permanently pubescent 

 twigs ; leaves lanceolate to ovate-oblong, rarely obovate, glaucous beneath. 

 Mo. to Neb. and I. T. A poorly understood tree, said to flower earlier than 

 S. cordata; perhaps a variety (var. vestita Anders.) of that species. FIG. 651. 



O O Leaves glossy above, glabrous from the first. 

 13. S. glaucophylla Bebb. Leaves from ovate or obovate to oblong-Ian ceo- 



650. S. cordata. 



651. S. missouriensis. 



