SALICACE&. 295 



cious; both kinds in aments, achlamydeous, in the axils of i- 

 flowered bracts. Stamens 2-several, distinct or monadelphous. 

 Ovary I -celled, 2-valved. Seeds numerous, with a silky coma. 



( Catkin-scales entire, stigmas short Salix. 

 SALICACE^E.-^ 



( Catkin-scales cleft, stigmas long Populus. 



I. Salix. Aments cylindric ; bracts entire, i-flowered. Barren 

 flowers calyx none ; stamens 2-8, rarely I, accompanied by glands. 

 Fertile flowers each with a gland at base ; ovary simple ; stigmas 2, 

 short, mostly bifid. Shrubs and trees. 



1. S. TRISTIS (Sage Willow), Leaves nearly sessile, narrow-lanceolate, 

 cuneate at base, acute or obtuse, woolly on both sides, at last nearly smooth ; 

 stipules minute, disappearing very early ; aments small, nearly globular 

 when young, loosely flowered ; ovaries tapering to a long point, silky-pubes- 

 cent ; style short, stigmas bifid. A straggling shrub, io'-i8' high. April- 

 May. 



2. S. HUMILIS (Low Bush Willow). Leaves lanceolate or oblanceolate, 

 abruptly acute or obtuse, petiolate, nearly smooth above ; stipules usually 

 present, varying from half ovate to lunate, entire or dentate ; style long ; 

 stigma bifid. Stem 3-8 feet high. April-May. 



3. S. VIMINALIS (Osier, Basket Willow}. Branchlets very long, straight 

 and slender ; leaves linear-lanceolate, very long-acuminate, nearly entire, 

 white beneath, with silky pubescence ; aments densely clothed with long 

 hairs ; ovary elongated ; style filiform ; stigmas linear. A large shrub, 

 10-15 feet high, in wet meadows. May. 



4. S. CORD ATA (Heart-leaved Willow'). Leaves lanceolate, or ovate- 

 lanceolate, sharply serrate, acuminate at base, smooth, paler beneath ; stip- 

 ules reniform, dentate ; aments appearing with the leaves, furnished with 

 several leafy bracts at base ; ovary pedicellate, smooth, lanceolate, acumi- 

 nate. A variable shrub, 4-15 feet high, in wet grounds. May. 



5. S. BABYLONICA (Weeping Willow). Branchlets very long and slen- 

 der, drooping ; leaves lanceolate, acuminate, smooth, glaucous beneath ; stip- 

 ules roundish-oblique, acuminate ; ovaries sessile, ovate, smooth. A beauti- 

 ful tree, cultivated. 



2. Populus. Aments cylindrical. Bracts fringed and lobed at 

 apex. Flowers on an oblique, turbinate disk. Stamens 830. Style 

 very short. Stigma long, bifid. Aments drooping and preceding the 

 leaves. Trees. 



1. P. TREMULOIDES (American Aspen, White Poplar). Leaves round- 

 ed-cordate, abruptly acuminate, dentate, smooth on both sides, pubescent on 

 the margin, dark green, on flattened petioles ; scales of the ament cut into 

 several linear segments, fringed with hairs. A common tree in forests. 

 April. 



2. P. GRANDIDENTATA (Large Poplar). Leaves roundish-ovate, acute, 

 dentate, with large, unequal, sinuate teeth, white-downy beneath when 



