NATIVE WOODY PLANTS OF THE UNITED STATES Oa 
Tetradymia canescens DC. Gray horsebrush, 
T. linearis Rydb. 
Range: 4, 6, 7, 8, 9, 10, 138, 14. 
Site: Dry, sun. 
Fruit: Achene. 
A smail, freely-branched shrub; flowers July-August; occurs in sandy and 
rocky soils. 
Var. inermis (Nutt.) Gray, (7. inermis Nutt.) the spineless horsebrush, 
occurs with the species, often on alkaline soil. Considered worthless or poor 
winter feed for stock; possibly poisonous to sheep. 
Tetradymia comosa Gray. Hairy horsebrush. 
Range: 10. 
Site: Dry, sun. 
Fruit: Achene. 
A small, many-stemmed shrub. 
Tetradymia glabrata Gray. Littleleaf horsebrush. 
Range: 8, 9, 10. 
Site: Dry, sun. 
Fruit: Achene. 
A small shrub; flowers June-August; commonly without leaves from about 
June 15. Generally not palatable to livestock; sheep poisoned by it, especially 
when taken in large quantities in the spring; poisonous effect cumulative; 
apparently not poisonous to cattle. 
Tetradymia inermis, see J'etradymia canescens. 
Tetradymia linearis, see Tetradymia canescens. 
Tetradymia longispina, see Tetradymia spinosa. 
Tetradymia nuttallii Torr, and Gray. Nuttall horsebrush. 
Range: 9, 13. 
Site: Dry, sun. 
Fruit : Achene. 
A small prickly shrub; fiowers May—August; of local browse value for sheep. 
Tetradymia spinosa Hook. and Arn. Shortspine horgebrush. 
Range: 8, 9, 10. 
Site: Dry, sun. 
Fruit: Achene. 
A small, rigid, divaricately-branched shrub; flowers May—August; somewhat 
spiny. Var. longispina Jones, (7. longispina (Jones) Rydb., 7. axillaris Nels.) 
occurs in the southern part of the range. 
Observations: A valuable forage for antelope. Locally valuable as a forage 
for sheep. 
Tetradymia squamata, see Lepidos»aritum squamaium. 
Tetradymia stenolepis Greene. Mohave horsebrush. 
Range: 4, 10. 
Site: Dry, sun. 
Fruit: Achene. 
A small, much-branched shrub. 
Thamnosma montana Torr. and Frem. Turpentine-brocm, 
Range: 9, 10, 11. 
Site: Dry, sun. 
Fruit: Capsule. 
A small shrub; flowers April-May; branches broomlike; leaves early decidu- 
ous. Not palatabie to livestock. 
Thuja spp. Arborvitae. 
Stomach records (in addition to specific records): Four species of birds, 
including ruffed grouse. 
Thuja occidentalis L. Northern white cedar. 
Range: 22, 28, 24, 26, 27. 
Site: Dry, well-drained, sun, shade. 
Fruit: Cone; mature in early autumn, persistent through the winter. 
A small to large, evergreen tree; root system usually shallow, or deeper on 
dry sites; slow growing, long-lived; very easily damaged by fire and wind; 
mature trees often decay at the base; wood durable, important commercially ; 
33772°—38——-18 
