138 SALICACEAE (WILLOW FAMILY) 



or bifid. Streams and wet places in the Black Hills and in Montana. A com- 

 mon species in the eastern and central States. 



29. Salix Scouleriana Barr. 1. c. 145. Shrub with rather slender twigs, 

 glabrous to densely pubescent: leaves obovate or oblanceolate, obtuse or 

 mostly abruptly acute at the apex, cuneate at the be, 3-8 cm. long, 1.5-3.5 

 cm. wide, entire or shallowly crenulate-serrulate, dark green and glabrate 

 above, glaucous, strongly reticulate-veined, and sometimes densely tomentose 

 beneath; stipules minute, entire, or small, finely dentate: staminate aments 

 sessile, 2-3 cm. long, 1.5 cm. wide; pistillate longer, short-peduncled, 3-5 cm. 

 long, 1.2-1.5 cm. wide; scales black, obovate, long-villous: capsules rostrate, 

 7-9 mm. long, tomentose; pedicels 1-2 mm. long, pubescent; stigmas about 

 1 mm. long. S. ftavescens. (S. Nuttallii Sarg. Gard. & For. 8: 463. 1895.) 

 Forms with short, stout aments may be referred to var. crassijulis Anders. 

 Common along mountain streams at elevations of 1,500-3,000 m.; New 

 Mexico to Alberta and west to the coast. 



XII. ROSTRATAE. Shrubs 2-5 m. high; twigs slender, divaricate, full of 

 leaf-scars, the younger very leafy: leaves linear-oblanceolate to elliptic-oval, 

 mostly entire, more or less pubescent on both sides; stipules usually none: 

 aments coetaneous; the staminate small, subsessile with small leafy bracts 

 at the base; the pistillate on pubescent leafy peduncles, rather lax in fruit; 

 scales linear-oblong, acute, thinly pilose, tawny, reddish at the tips: capsules 

 long-pediceled, conic-rostrate, 5-10 mm. long, pubescent; styles short or none; 

 stigmas short, divided. 



Leaves elliptic-oval, pedicels 2-5 mm. long; branches without bloom 30. S. Bebbiana. 

 Leaves linear-oblanceolate, pedicels 1.5-2.5 mm. long; branches with 



bloom . . . . . . . . . . . . 31. S. Geyeriana. 



30. Salix Bebbiana Sarg. Gard. & For. 8: 463. 1895. A tall shrub with 

 few stems, or a small tree, 2-5 m. high; twigs short, brown or darker, 

 pubescent or glabrate : leaves small to medium, narrowly elliptical and acute 

 at both ends to broadly oblanceolate or obovate-oval and abruptly short- 

 acuminate, 2-4 or 5 cm. long, 1-2 or 2.5 cm. wide, entire or occasionally 

 glandular-crenulate, dull green above, paler or subglaucous and reticulated be- 

 neath, more or less pubescent on both surfaces or glabrate in age; stipules 

 none, or small, dentate: staminate aments subsessile or on short peduncles, 

 slender, 1-2 cm. long, 5-7 mm. wide, yellowish; filaments capillary; pistillate 

 aments (on peduncles 0.5-2 cm. long) 2-4 or 6 cm. long, 1-2 cm. wide, very 

 lax in fruit; scales in both sexes lanceolate-oblong, 1-2 mm. long, acute: 

 capsules 6-9 or 10 mm. long, thinly pubescent; pedicels slender, pubescent, 

 2-5 mm. long; stigmas deeply divided. (S. perrostrata Rydb. in Bull N. Y. 

 Bot. Gard. 2: 163. 1901.) Along streams and in wet ground, throughout 

 our range; ascending to 3,000 m. altitude. 



31. Salix Geyeriana Anders. Oefvers. Vet. Akad. Foerh. 15: 122. 1858. 

 Shrub 1-3 or 4m. high; twigs glabrous, very leafy, black with a bluish bloom: 

 leaves small, linear-oblanceolate or elliptical, acute or short-acuminate at apex, 

 acute at base, 2-4 or 6 cm. long, 5-10 mm. wide, dark green above, more or less 

 glaucous beneath, thinly or densely silky-pilose on both surfaces, margins entire, 

 revolute ; stipules none: aments on pubescent leaf y peduncles, 0.5-1 cm. long, the 

 leaves often exceeding the ament, the staminate 1 cm. or less, oblong; the pistil- 

 late subglobose, numerous, 1 or occasionally 2 cm. long, 1-1.3 cm. wide; scales 

 linear-oblong, acute, thinly pilose, the base tawny, the tip red : capsules 5-7 mm. 

 long, rostrate; pedicels stout, pubescent, 2-2.5 mm. long; styles short or none; 

 stigmas short, divided. S. macrocarpa Nutt. A plant of stream banks and wet 

 places, at middle altitudes; Colorado to Montana, west to the coast. 



XIII. RETICULATAE. Densely caespitose, low or creeping alpine shrubs, 

 0.5-8 dm. high, with ellipticcl-oblong , obovate or suborbicular leaves, strongly ' 

 reticulate and glaucous beneath; petioles slender, channeled; stipules none: 

 aments on naked peduncles arising opposite the last leaf: capsules small, ses_f 

 sile, tomentose; styles none; stigmo.s sh^ , divided, 



