SALIX NIGRA Marshall. Black Willow. (× 1/2.)]

=1.= =Salix nìgra= Marshall. Willow. Black Willow. Plate 10. Shrub or

tree 5-20 m. (17-65 feet) high, dark green in mass color; bark of trunk

thick, rough, flaky, dark brown to nearly black; twigs brittle at base,

the younger pubescent and green, becoming glabrous and darker with age;

buds ovate, small, 2-3 mm. (1/8 inch) long; petioles 3-6 or 8 mm.

(1/8-3/8 inch) long; stipules small, ovate to roundish; leaf blades

narrowly lanceolate, acute or rounded at base, long-acuminate at the

apex, 6-11 cm. (2-1/4-4-1/4 inches) long, 7-12 mm. (1/4-1/2 inch) wide,

often falcate (scythe-shaped), the so-called variety =falcata=, finely

serrate, green on both sides, shining above, paler and dull beneath,

glabrous or sometimes pubescent beneath on midrib and larger veins;

flowers appearing with the leaves in late April in the southern part of

the State and well into May in the northern part; catkins slender, 2-5

or 6 cm. (4/5-2 or 2-1/2 inches) long, the staminate bright yellow;

capsules 3-5 mm. (1/8 inch) long, ovoid or ovoid-lanceolate, on pedicels

1-2 mm. (1/16 inch) long.

=Distribution.=--New Brunswick and New England, westward to the eastern

part of the Great Plains area from North Dakota to Texas, and, in some

forms, westward across that State and into Mexico. It is interesting

that this species, the first willow published in America, in the first

book on American Botany ever published in this country, should be

abundantly and widely distributed in the United States.

Specimens have been seen from the following counties in Indiana:--Allen

(Deam); Bartholomew (Deam); Clark (Deam); Crawford (Deam); Dearborn

(Deam); Dubois (Deam); Decatur (Deam); Floyd (Deam); Fulton (Deam);

Harrison (Deam); Hendricks (Deam); Henry (Deam); Jackson (Deam); Jay

(Deam); Jennings (Deam); Knox (Deam); Kosciusko (Deam); Lagrange (Deam);

Marion (Mrs. Chas. C. Deam); Marshall (Deam); Miami (Deam); Morgan

(Deam); Noble (Deam); Ohio (Deam); Parke (Deam); Perry (Deam); Porter

(Deam); Posey (Deam); Pulaski (Deam); Ripley (Deam); Steuben (Deam);

Sullivan (Deam); Tippecanoe (Deam); Vermillion (Deam); Wabash (Deam);

Warrick (Deam); White (Deam).

=Economic Uses.=--The black willow is used very extensively along the

lower reaches of the Mississippi River in making mattresses which

protect the levees from washing. In 1912, it was estimated that 150,000

cords were used annually.

=2.= =Salix amygdaloìdes= Andersson. Willow. Peach-leaved Willow. Plate

11. Trees 3-12 m. (10-40 feet) high, yellowish-green in mass color; bark

of trunk fissured, dark brown or reddish-brown; twigs longer and less

brittle than those of _Salix nigra_, yellowish to reddish-brown, usually

somewhat drooping, giving a "weeping" effect, which, with the color,

makes the species easily recognizable from a distance; buds ovoid, about

3 mm. (1/8 inch) long, colored as the twigs; petioles long, slender,

twisted, 5-15 or 20 mm. (1/4-4/5 inch) long; leaves lanceolate to

broadly lanceolate or ovate-lanceolate, rounded or somewhat acute at

base, long-pointed at apex, closely serrulate, 5-12 cm. (2-5 inches)

long, 1.5-3 cm. (3/5-1-1/4 inches) wide, yellowish-green above, glaucous

beneath, glabrous; flowers appear from late April throughout May,

usually later than those of _Salix nigra_; catkins slender, 3-5 cm.

(1-2 inches) long, the fertile becoming 4-8 cm. (1-1/2-3 inches) long in

fruit; capsules lanceolate, 4-5 mm. (1/6 inch) long; pedicels slender, 2

mm. (1/12 inch) long.

[Illustration: Plate 11.

Trees of Indiana First Revised Edition (Publication No. 13, Department of Conservation, State of Indiana) · 第 46 / 265 题