NATIVE WOODY PLANTS OF THE UNITED STATES 
271 
Tetradymla canescens DC, Gray horsebrush. 
T. linearis Rydb. 
Range : 4, 6, 7, 8, 9, 10, 13, 14. 
Site: Dry, sun. 
Fruit: Acliene. 
A small, freely-branched shrub; flowers July-August; occurs in sandy and 
rocky soils. 
Var. inermis (Nutt.) Gray, {T. 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 Tetradymia canescens. 
Tetradymia linearis, see Tetradymia canescens. 
Tetradymia longispina, see Tetradymia spinosa. 
Tetradymia nuttallii Torr. and Gray. Ifuttall horsebrush. 
Range: 9, 13. 
Site: Dry, sun. 
Fruit: Achene. 
A small prickly shrub ; flowers May-August ; of local browse value for sheep. 
Tetradymia spinosa Hook, and Arn. Shortspine horsebrush. 
Range : 8, 9, 10. 
Site : Dry, sun. 
Fruit: Achene. 
A small, rigid, divaricately-branched shrub ; flowers May- August ; somewhat 
spiny. Var. longispina Jones, {T. longispina (Jones) Rydb., T. 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 Lepidospartum squamatum. 
Tetradymia stenolepis Greene. Mohave horsebrush. 
Range : 4, 10. 
Site : Dry, sun. 
Fruit : Achene. 
A small, much-branched shrub. 
Thamnosma montana Torr. and Frem. Turpentine-broom. 
Range : 9, 10, 11. 
Site : Dry, sun. 
Fruit : Capsule. 
A small shrub; flowers April-May; branches broomlike; leaves early decidu- 
ous. Not palatable to livestock. 
Thuja spp. Arborvitae. 
Stomach records (in addition to specific records) : Four species of birds, 
including ruffed grouse. 
Thuja occidentalis L. ITorthern white cedar. 
Range : 22, 23, 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 ; 
130186°— 39 18 
