Spring Flora of Oklahoma 
19 
merous seeds, provded with rather long and silky down, 
by means of which they are transported by the wind. 
Bracts fimbriate or incised; stamens numerous; stig¬ 
mas elongated. I. Populus. 
Bracts entire; stamens 2-10; stigmas short. 
II. Salix. 
I. POPULUS. L. 
Trees with scaly, resinous buds, terete or angled twigs 
and broad or narrow, usually long-petioled leaved. The 
stipule minute, fugacious. Staminate aments dense, pen¬ 
dulous. Pistillate aments pendulous, erect or spreading. 
Ovary sessile. Style short, stigmas 2-4, entire or 4-lobed. 
1. Populus deltoides Marsh. Cottonwood. A tree attaining the 
height of 150° and a trunk diameter of 7°-8°. Foliage glabrous. 
Leaves broadly deltoid-ovate, abruptly acuminate at the apex, cren- 
ulate, truncate at the base. Petiole flattened laterally, stout. Bracts 
glabrous, deeply-fimbriate. Staminate aments drooping, 3'-5' long, 
5"-6" in diameter. Pistillate aments loosely flowered. Capsules 
ovoid, acute, 2-4-valved. 
In moist soil. Common. Mjarch-May. 
II. SALIX (Tour.) L. 
Shrubs or trees, with single-scaled buds. Leaves usu¬ 
ally long and narrow. Stipules sometimes leaf-like or 
often small and soon deciduous. Bracts of the catkins 
entire. Staminate flowers with 1-10, mostly 2, stamens, 
distinct or united. Pistillate aments usually erect or 
spreading. Stigmas 2, entire or 2-cleft. 
Stamens 3-7; filaments hairy at the base; bracts caduc¬ 
ous, light yellow. 
Leaves green or pale beneath. 
Leaves narrowly lanceolate; petioles very short. 
1. S. nigra. 
Leaves broadly lanceolate; petioles slender. 
2. S. amygdaloides. 
3. S. Wardi. 
Leaves whitish beneath. 
