168 SALICACEAE 
Bracts at base of flowers not slit or divided . . . . Salix 
Bracts at base of flowers divided . . . . . . Populus 
1. SALIX, (Tourn.) L. 
Trees or shrubs, mostly along streams. Long slender flexible branches 
with, in most species, long narrow sharp pointed leaves, sharply toothed, 
or nearly entire. The aments—*‘ pussys”—appear in early spring before 
the leaves. 
1. Catkins on short leafy branches; leaves all lance-shaped 
Stamens more than 2 in each axil 
Trees from 15 to 50 or more ft. high. 
Leaves very finely and closely notched around the entire border. 
Leaves linear lance-shaped - 
- S. Wheeleri 
heaves) namow.llance-shapedi mate. wes cneeemeees 1 fs ney ena ees S. nigra 
ieeaves» broad. Jance-shaped i 20 alist eee) i) bs a ne re amygdaloides 
eaves) Ovate-lance-shaned os) .) ct pcunieeiewiccieeten fon Mou s) Caicos S. lucida 
Leaves elliptic lance-shaped . . . «© . ow ae 6S Serissima 
Stamens 2 only in cere dei 
Tall tree with reddish-green pies seh se, pe ee Lak. aug top Eo ae 
Tall tree with yellow twigs . ecietan sm ke a (Siepaiba 
Tall tree with -very long slender green twigs A Ba? babylonica 
Leaves with distinct teeth (1/20 to 1/1o in. apart). Branching shrub, 2 to 
io ft. high. 
Leaves marrow lance-shaped . . ieee Lace ac S. longifolia 
Leaves broad lance-shaped or oblong he. Helo ic Fics eee glaucophylla 
2. Catkins lateral on the branches or at ithe terminals 
Stamens 2 in each axil 
Small trees or shrubs 6 to 18 it. high. 
Leaves narrow lance-shaped, broadest near the apex . . . . . S. purpurea 
Leaves elliptic or lance-ovate. 
HMainya aDOVeN lye ye . S. Bebbiana 
Smooth green above, nearly “white “beneath, ‘teeth minute. or none S. discolor 
Leaves oblong, firm, borders distinctly toothed, young branches densely hairy. 
Bracts not as long as the individual flower pedicels . . . . S._eriocephala 
Leaves as above, young branches not hairy, bracts as above . . S. prinoides 
Bracts longer than the flower pedicels . . . . . «. - «+ S._squamata 
Leaves) rather broad) lance-shaped) <* ns Uac) eeu so ce, a) a ee See 
Shrubs 2 to 1o ft. high. 
Leaves lance-shaped, scarcely notched. 
Twigs not very hairy. 
Leaves grayish, hairy beneath . ate 6 «© Ss miss 
_ Leaves silvery with silky hairs beneath » see swe OS, Se 
Twigs very hairy, leaves oval . . . . = « « « « Se adenopnyia 
eaves: narrow. egg-shaped =) Js) 20 6 9s =) 5 « Sa eunpoceeee 
Leaves heart-shaped at base . Se ees se) ey e's) 8 Se Care 
Leaves elliptic or broad lance- -shaped, tapering at ‘base <- «© w*« « Os PAVNoponE 
Leaves ovate or oval, rounded at base . . oe 0 6 De Valsamiirera 
Shrub 2 to 5 ft. igh 
Leaves narrow lance-shaped or elliptic, white beneath . . . . . S. candida 
Shrubs 6 in. to 2 ft. high. 
Leaves: dance-etiaped: 2c oS petit tele, toe Wie) el ee. bel see oe) | oe 
Leaves narrow elliptic, broadest toward the apex . . . . . S. argyrocarpa 
Leaves elliptic, tapering equally at both ends . . . . . . S. myrtilloides 
Shrubs less than 1 ft. high. 
Leaves pear-shaped, broadest toward apex . . . . . . «. « « S. Uvu-ursi 
Geavea: ‘orbicilars sh su ae se. wl er we a ion cs, ey ge) 0 
1. §. nigra, Marsh. (Fig. 1, pl. 23.) Brack Wirtow. Usually a 
small tree, 15 to 30 ft. high, but rarely reaching a much greater height. 
Leaves narrow lance-shaped, tapering sharply at both ends. Branches 
pale yellow; leaves deep green above, somewhat lighter below; leaf- 
