3*6 FLORA. 



19. Salix myrtilloides L. Bog Willow. (I. F. f. 1204.) An erect slender 

 glabrous shrub, 3- 10 dm. high, the twigs light brown, terete. Leaves oblong, 

 elliptic or somewhat obovate, obtuse or acute at the apex, entire, mostly narrowed 

 at the base, 2-4 cm. long, 8-16 mm. wide, short-petioled, bright green above, pale 

 or glaucous beneath, their margins slightly revolute; aments expanding with the 

 leaves, leafy-bracted at the base, rather dense, 2 cm. long or less, or the pistillate 

 longer in fruit; bracts persistent, obtuse, slightly villous; style shorter than or 

 equalling the stigmas; capsule oblong-conic, obtuse, glabrous, 5 mm. long, 2-3 

 times as long as the filiform pedicel which slightly exceeds the bract. In bogs, 

 N. B. and Quebec to Br. Col., south to N. J. and Iowa. Also in northern Europe. 

 April-May. 



Salix myrtilloides pedicelliris Anders. Leaves narrower, oblong-linear or oblanceo- 

 late; pedicels sometimes longer. Range of the type. 



20. Salix luteosencea Rydb. Silvery Sandbar Willow. A shrub, 

 with grayish bark, 1-6 m. high, occasionally monoecious; leaves linear-lanceolate 

 or linear, entire, or slightly and remotely denticulate, acute, 2-8 cm. long, 2-6 mm. 

 wide, permanently yellowish silky; aments at the ends of leafy branches, the stam- 

 inate 2-3 cm. long, pistillate 3-5 cm.; bract of staminate flowers obovate; of the 

 pistillate ones broadly lanceolate; capsule elongated-ovoid, slightly silky when 

 young, soon glabrate, 4-5 mm. long. On sandbars, Saskatch. and Br. Col. to 

 Neb., Ind. Terr., and Ariz. Type from Nebraska. 



21. Salix interior Rowlee. Sandbar Willow. River-bank Willow. 

 (I. F. f. 1 181.) A much-branched shrub, 1-4 m. high, forming thickets, or some- 

 times a slender tree, 6-9 m. tall, and with a trunk 3 dm. in diameter; branches 

 brown or grayish. Leaves 6-10 cm. long, 5-10 mm. wide, acuminate, remotely 

 denticulate with somewhat spreading teeth, short-petioled, bright green; petioles 

 not glandular; stipules minute or none; aments on short leafy branches, the stam- 

 inate dense, 2-4 cm. long, the pistillate looser, about 5 cm. long in fruit; capsule 

 ovoid-conic, finely silky when young, glabrate in age, about 5 mm. long. Along 

 streams and lakes, Quebec to the N. W. Terr., south to Va., Ky. and Tex. April- 

 May. [S. fJuviatilis A. Gray, not Nutt.] 



22. Salix linearifolia Rydb. Linear-leaved Willow. A low shrub, 

 very soon glabrous, with red branches; leaves 4-10 cm. long, 2-4 mm. wide, remotely 

 dentate, narrowly linear; stipules minute, deciduous; aments loosely flowered at 

 the ends of leafy branches, the staminate about 3 cm., the pistillate 3-4 cm. long; 

 capsule almost glabrous from the beginning, conic, 3-4 mm. long; bract nearly 

 as long as the pistil, almost glabrous. Sandbars, from Minn, and Saskatch. to Ind. 

 Terr, and Colo. (S. rubra Richards.; not Smith.) 



23. Salix petiolaris J. E. Smith. Slender Willow. (I. F. f. 1189.) A 

 shrub, similar to S. sericea, but the young leaves only slightly silky, the branches 

 slender, upright or ascending. Mature leaves lanceolate, acuminate at both ends, 

 serrulate with blunt cartilaginous teeth, remaining green in drying, 8-i6mm. wide; 

 p •tioles 4-10 mm. long; stipules deciduous; aments expanding before the leaves, \ 

 the pistillate short-peduncled, usually rather loose, about 2 cm. long in fruit; stig- 

 mas nearly sessile; capsule tapering from an ovoid or oblong base, 4-6 mm. long, 

 about twice as long as the filiform pedicel. In swamps, N. B, to the N. W. Terr., \ 

 south to Tenn. and Wis. May. 



Salix petiol;\ris gracilis Anders. Pedicels nearly as long as the capsules ; leaves rather 

 narrower. Range of the type. 



24. Salix discolor Muhl. Glaucous Willow. (I. F. f. 1187.) A shrub or 

 low tree, maximum height 7 m., trunk diameter 3 dm.; young leaves sometime! 

 pubescent. Mature leaves rather thin, usually glabrous, bright green above, glau- 

 cous and nearly white beneath, oblong-oblanccolate. acute at both ends, irregularly 

 serrulate or nearly entire, slender-petioled, 4 10 cm. long, 1.5-3 cm. wide; petioles 

 6-24 mm. long; stipules obliquely lanceolate or semicordate, commonly deciduous; 

 aments unfolding much before the leaves, dense, the pistillate 4-7 cm. long in fruit; 

 capsule narrowly conic, tapering to a slender beak, 5-8 mm. long. In swamps or 

 on moist hillsides, N. S. to Man., Del. and Mo. March-April. 



