146 ^i'lSC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 
Jnglans cinerea L. Butternut. 
Range : 18, 19, 21, 22, 23, 24, 25, 26, 27, 28. 
Site : Well-drained, sun. 
Fruit: Nut, available September-November. 
A large monoecious tree; root system deep with a deep taproot, but rather 
v^idespreading ; rapid growing, especially when young; short lived; foliage 
much injured by defoliating insects ; very susceptible to fire damage ; wind-firm, 
but easily storm damaged ; ordinarily occurs on rich soils but will grow on some- 
what poorer and drier soils than J. nigra; wood somewhat used commercially; 
heartwood durable ; propagation is by seed stratified in the fall and sown in 
spring; 16-40 seeds per pound, germination 80 percent; somewhat difficult to 
transplant ; sugar may be produced from this species as in sugar maple. 
Observations: White-tailed deer, cottontail rabbit, red squirrel, and other 
squirrels. 
Juglans glabra, see Carya gJalyra. 
Juglans hindsii Jeps. Hinds walnut. 
J. calif ornica hindsii Jeps. 
Range : 1, 3, 4. 
Site : Well-drained, sun. 
Fruit: Nut. 
A large tree ; not resistant to walnut yellows ; 30 seeds per pound. 
Juglans major (Torr.) Heller. Arizona walnut. 
J. rupestris major Torr. 
Range: 11, 16, 17. 
Site : Well-drained, sun. 
Frjiit : Nut. 
A small or large shrub to large tree; taproot much developed, especially in 
early stages ; at first rapid growing, later slower ; long-lived : wood very durable 
in contact with soil; fruit borne abundantly every 2 or 3 years; 45 seeds per 
pound, germination 30-50 percent ; occurs in many kinds of soil. 
Observations: Much eaten by squirrels and other rodents. 
Juglans myristicaeformis, see Carya myristicaeformis. 
Juglans nigra L. Black walnut. 
Range : 18, 19. 20, 21, 22. 23, 24, 25, 26, 27, 28, 29, 30. 
Site: Well-drained, sun, shade. 
Fruit: Nut, available October-November. 
A large monoecious tree ; root system deep, widespreading ; will not grow on 
dry or poor soils ; rapid growing, especially when young ; long-lived ; wind-firm ; 
fire resistant; foliage much attacked by caterpillars; wood injured by borers; 
generally free from fungus attacks : wood of great commercial value, very dur- 
able ; begins bearing at 10 to 15 years of age ; propagation is by seeds stratified 
and sovrn in spring ; about 25 seeds per pound, germination 90-95 percent ; much 
cultivated. 
Observations: White-tailed deer, red squirrel, and other squirrels. Not pal- 
atable to cattle. 
Juglans ovata, see Carya ovata. 
Juglans rupestris Engelm. Texas walnut. 
J. ichiiwleana Torr. 
Range : 11, 14, 16, 17, 19, 20, 29. 
Site : Drv. well-drained, moist, sun. 
Fruit: Nut. 
A small to large shrub to small or rarely a large tree ; seedlings with a deep- 
growing taproot, fairly rapid growing; occurs commonly on limestone soils; 
may often form thickets; often branched to the base; fruit generally borne 
in abundance every 2 or 3 years; 75 seeds per pound. What was formerly 
considered merely a western form of this species is here treated as J. major, 
although it is often given only varietal rank and intermediate forms exist. 
Observations: Rock squirrel: favorite food of Huachuca squirrel. 
Juglans whippleana, see Juglans rupestris. 
Juniperus spp. Junipers. 
Evergreen, commonly dioecious, or rarely monoecious trees or shrubs; fruit 
a berrylike cone maturing in 1 to 3 seasons. Some forms are of value commer- 
