NATIVE WOODY PLANTS OF THE UNITED STATES A5 
Albizzia julubrissin Duraz. Silktree. 
Range: 29, 30. 
Site: Dry, well-drained, sun, shade. 
Fruit: Legume, available September—November. 
A large tree introduced from Asia and Africa; 11,000 seeds per pound, 3,000 
usable plants per pound of seed. 
Alhagi camelorum Fisch. Camelthorn. 
Range: 10, 11. 
Site: Dry, well-drained, sun. 
Fruit: Legume, available August-September. 
A small, spiny shrub naturalized from Asia Minor; rapid growing; aggressive 
and thicket forming; root system deep and extensive; eradication operations 
for this species have been in progress. 
Allenrolfea occidentalis (Wats.) Kuntze. Inkweed. 
Spirostachys occidentalis Wats. 
Range: 8, 9, 10, 11, 16. 
Site: Well-draingd, moist, sun. 
Fruit: Achenelike. 
A small to large, succulent, almost leafless shrub, usually confined to and an 
indicator of alkaline soil. Sparingly eaten by livestock. 
Alnus spp. Alders. 
Generally rapid growing; commonly occurring in neutral soil; wood durable 
in water; nitrogen-fixing bacteria form nodules on the roots of alder in some- 
what the same manner as on the legumes; propagated by seeds sown in fall 
or spring; or in the shrubby species, by hard-wood cuttings and layers. 
Stomach records (in addition to specific records) : 20 species of birds, includ- 
ing sharp-tailed grouse, ruffed grouse, bobwhite, woodcock, and ptarmigan. 
Composed 2.5 percent of the food of northern sharp-tailed grouse in winter in 
Quebee and Ontario; Lilinois skunk, opossum. Obdservations (in addition to 
specific records) : Sixteen species of birds; an emergency food of prairie Sharp- 
tailed grouse, northern sharp-tailed grouse; snowshoe hare, Pacific mountain 
beaver, brown mountain beaver, porcupine, Olympic wapiti; beaver, where 
Populus is lacking; moose, white-tailed deer. Palatability to livestock not high 
but considered an important secondary forage, especially for cattle. A source 
of pollen for bees. 
Alnus alnobetula, see Alnus crispa. 
Alnus crispa (Ait.) Pursh. Green alder. 
A. alnobetula of Amer. auth., not Koch. 
Range: 26, 27. 
Site: Dry, well-drained, moist, Sun. 
Fruit: Nutlet, borne in a cone. 
A large shrub with somewhat decumbent branches. 
Var. mollis (Fern.) Rehd., (A. mollis Fern.) is a small tree occurring in 
regions 23, 24, 26, and 27. 
Observations: Redpoll; an important summer browse of moose on Isle Royale. 
Alnus fruticosa, see Alnus sinuata. 
Alnus glutinosa (L.) Gaertn. European black alder. 
A. vulgaris Hill, A. rotundifolia Mill. 
Range: 26, 27. 
Site: Well-drained, sun. 
Fruit: Nutlet, borne in a cone. 
A small tree introduced from Hurope, with many varieties known in cultiva- 
tion; about 10,000 usable plants per pound of seed. 
Observations: Much eaten by ruffed grouse in New York. 
Alnus incana (L.) Moench. Speckled alder. 
Ranges 21) 22.23. 24.26, 27. 
Site: Well-drained, moist, sun, shade. 
Fruit: Nutlet, borne in a cone, available August-September. 
A large shrub to small tree with very thick and dense foliage; rapid growing; 
thicket forming; a naturally occurring stream-hbank protector; 256,000-625,000 
ae ae pound, about 10,000 usable plants per pound of seed; easily trans- 
planted. 
