Flora of the Palousc Region 53 



S. lasiandra var. fendleriaiia Bebb. Tree 10-20 m. tall, with rough lon- 

 gitudinally-fissured bark: leaves lanceolate, long-acuminate, crenulate, green 

 and glabrous on both sides, 8-16 cm. or more long; the sliort petioles and the 

 very base of the leaf glandular; stipules ear-shaped, sometimes large: 

 aments on leafy branchlets: staminate dense, 3-5 cm. long; scales pale, ob- 

 long, more or less dentate: stamens 5 or more, the filaments hairy at the 

 base: pistillate rather loose, the pale oblong scales hairy at the base, decid- 

 uous: carpel glabrous, short-pedicelled: stigma nearly sessile. Common on 

 stream banks. 



S. amygdaloides Anders. Tree 5-10 m. tall, with cinnamon-colored fis- 

 sured bark: leaves glabrous, lanceolate, serrate, attenuate-acuminate, green 

 above, glaucous beneath, 10-15 cm - long: petioles slender, without glands; 

 stipules ear-shaped or reniform, usually small and quickly deciduous: aments 

 on leafy branchlets: staminate flexuous, dense, 5-6 cm. long; scale pale, 

 hairy; stamens 5 or more: pistillate becoming loose and elongated: capsules 

 glabrous, the slender pedicels much exceeding the pale fugacious scales: 

 stigmas sessile or nearly so. Common on the banks of Snake River. 



S. exigua Nutt. Shrub, 3-5 m. tall, usually with a single trunk: bark 

 rough, longitudinally cracked: twigs glabrous: leaves acute, sub-entire, nar- 

 rowly lanceolate or oblanceolate, 3-10 cm. long, 4-10 mm. wide, glabrate 

 above, sparsely appressed-silky beneath, the veins obscure; petioles very 

 short; stipules none or very small: aments on leafy branchlets, solitary or 

 2-4; staminate aments 2-5 cm. long, slender, the scales lanceolate, acute: 

 capsules becoming glabrous, sessile: stigmas sessile. Common along streams. 

 Forms with denticulate leaves are probably referable here. 



S. melanopsis Nutt. Much like the preceding species: twigs glabrous: 

 leaves glabrous on both sides or glaucous beneath, remotely denticulate: 

 stipules triangular-ovate, acute, few-toothed: capsules glabrous; scales obtuse. 

 Low shrub on the edge of Snake River, where it is frequently covered with 

 water until July. . 



S. argophylla Nutt. Very similar to S. exigua, but the young twigs 

 pubescent and the leaves densely appressed-silky on each side: capsules 

 somewhat hairy. Banks of Snake River. 



S. SCOUleriana Barratt. Shrub or tree, 4-10 m. tall, with dull gray bark: 

 leaves very variable, oblong, elliptic or obovate, acute, acuminate, or obtuse, 

 entire or serrulate, green above, usually down}- beneath, this becoming rusty 

 in age, 2-12 cm. long; petioles rather short; stipules large, ear-shaped, den- 

 tate, persistent on sterile shoots: aments appearing before the leaves, very 

 densely flowered; scales black, hairy, persistent: staminate aments sessile; 

 stamens 2, with glabrous separate filaments: pistillate short- peduncled; car- 

 pels hairy, long-beaked, the pedicels equalling the scales; stigmas sessile. 

 Frequent along streams and in open coniferous woods. 



S. bella Piper. Shrub, 2-4 111. tall, with slender, erect branches, the bark 

 gray and smooth: branchlets shining yellow, usually glabrous, very brittle: 

 leaves lanceolate or oblong, or oblong-obovate, acute, 3-6 cm. or more long, 

 green and glabrate above, densely silvery-woolly beneath, entire or nearly 

 so; petioles short; stipules lunate, usually present: aments appearing before 

 the leaves: staminate sessile, short and thick, 1-2 cm. long; scales acute, 

 black, densely villous; stamens 2: pistillate short-peduncled, 2-3 cm. long; 

 scales black, obtuse, densely villous; capsules silky-hairy, nearly sessile; 

 style 1.5 mm. long. Near Garrison, rare; along the North Fork of the Pa- 

 louse, common. 



