342 SALICACEAE 



obtusish, nearly glabrous : style very short : stigmas lobed : capsules rarely containing fer- 

 tile seeds, ovoid-conic. 



Naturalized in eastern North America, except the extreme north. Native of Asia. 



8. Salix Floridana Chapm. A branching shrub 2-4 m. tall, with sparingly pul^escent 

 twigs. Leaf-blades oblong or oblong-lanceolate, 5-8 em. long, acute, serrulate, glabrous, 

 dark-green above, glaucous beneath, rounded or truncate at the base ; petioles 4-10 mm. 

 long, pubescent : mature pistillate aments oblong-cylindric, 4-7 cm. long, fully 2 cm. 

 thick, dense : capsules ovoid-conic, G-8 mm. high, glabrous. 



On rocky banks, middle and western Florida. 



9. Salix cordkta Muhl. A shrub 1-5 m. high, often widely spreading from the base. 

 Twigs stout, usually hairy : winter buds plano-convex, decidedly larger on the staminate 

 than on the pistillate shoots : leaf-blades oblong-lanceolate, sharply serrate, tapering, 

 rounded, or obscurely cordate at the base, green on both sides, usually silky when young, 

 glabrous at maturity, not blackening in drying ; stipules mostly large and conspicuous : 

 aments very silky, appearing before the leaves, the staminate about 2 cm. long : stamens 

 2, with free filaments : ijistillate aments 3-C cm. long, 1 cm. thick : stigmas short and thick, 

 usually two-lobed : capsules ovoid, acute. 



In wet soil or on banks of streams. New Brunswick to British Columbia, North Carolina. Missouri 

 and California.— A form with linear-lanceolate leaf-blades is, S. cordata angustdta (Pursli) Anders. 



10. SalLx Missouri6nsis Bebb. A tree, reaching a height of 15 m., with a trunk 

 usually less than 5 dm. thick and gray scaly bark. Twigs pubescent or puberulent : leaf- 

 blades lanceolate or sometimes oblanceolate, 7-15 cm. long, 1-3 cm. wide, acuminate, finely 

 serrate with gland-tipped teeth, usually glaucous beneath : aments appearing before the 

 leaves, the staminate 2.5-4 cm. long, pubescent, the pistillate 7-10 cm. long, silky : style 

 very short : capsules narrowly ovoid. 



On river banks, Missouri to Nebraska and the Indian Territory. 



11. Salix liiteosericea Rydb. A branching shrub 1-6 m. high, occasionally mon- 

 oecious, with grayish bark. Leaf-blades linear-lanceolate, or linear, 2-8 cm. long, 2-6 

 mm. wide, acute, entire or remotely denticulate, permanently yellowish silky : staminate 

 aments 2-3 cm. long ; bracts obovate : pistillate aments 3-5 cm. long ; bracts broadly lance- 

 olate : capsules elongated ovoid, 4-5 mm. long, soon glabrate. 



On sand bars, Saskatchewan and British Columbia to Nebraska, the Indian Territory and Arizona. 



12. Salix interior Rowlee. A low shrub, often forming thickets, or a slender tree 6-9 

 m. tall, with a trunk sometimes 3 dm. thick. Twigs brown to gray : buds plano-convex, 

 obtuse, very small : leaf-blades linear-lanceolate or linear, ordinarily 6-10 cm. long, less 

 than 1 cm. wide, varying to much wider, especially on young shoots, remotely dentate, the 

 teeth narrow and spinulose : aments on short lateral branches, which bear 4-6 leaves, 

 loosely flowered, the staminate 2-4 cm. long and 1-2 cm. thick ; bracts usually glabrous or 

 slightly hairy toward the base, narrowly oblong : filaments crisp-hairy below the middle : 

 capsules sometimes nearly or quite glabrous, conic-ovoid, about 5 mm. long. 



Along streams and lakes, Quebec to the Northwest Territory, Virginia, Tennessee and Texas. 



13. Salix linearifolia Rydb. A low branching shrub, with early glabrous foliage. 

 Branchlets red : leaf-blades narrowly linear or nearly so, 4-10 cm. long, 2-4 mm. wide, 

 remotely dentate ; stipules minute, deciduous : aments terminating leafy branches, loosely 

 flowered, the staminate about 3 cm. long, the pistillate 3-4 cm. long : bracts nearly glabrous, 

 about as long as the pistils : capsules conic, 3-4 mm. long, glabrous. 



On sand bars, Saskatchewan to Minnesota, the Indian Territory and Colorado. 



14. Salix petiolaiis J. E. Smith. A shrub 2-4 m. tall, with erect or ascending slender 

 branches. Leaf-blades lanceolate, 4-9 cm. long, slightly silky when young, acuminate at 

 both ends, serrulate with blunt cartilaginous teeth, short-jjetioled, remaining green in dry- 

 ing : aments unfolding before the leaves, the staminate, 1-2 cm. long, dense: pistillate 

 aments loosely flowered, becoming 2-2.5 cm. long : stigma.s nearly sessile : capsules ovoid- 

 oblong below the tapering apex, 4-6 mm. long, about twice as long as the slender pedicels. 



In swamps or low grounds, New Brunswick to the Northwest Territory and Tennessee. — .'<. pctio- 

 laris gnlcilis Anders, is a form with na^ro^ver leaf-blades and pedicels nearly as long as the capsules. 



15. Salix discolor Muhl. A shrub or small tree, becoming 7 m. high. Trunk 

 rarely 3 dm. thick, with dark bark : branches tough : IkkIs large, glabrous, nearly black : 

 leaf -blades oblong or oblong-lanceolate, 5-10 cm. long, sometimes silky when young, becom- 

 ing glabrous and rigid at maturity, dark-green above, glaucous-white beneath, entire or 

 remotely serrate, slender-petioled ; stipules conspicuous, acute : aments sessile, appearing 

 before the leaves, large, cylindric, the staminate brilliant yellow at anthesis ; bracts oblong, 

 rounded, fringed with long white hairs : pistillate aments becoming 4-7 cm. long : pedicels 



