NATIVE WOODY PLANTS OF THE UNITED STATES 271 



Tetradymia canescens DC. Gray horsebrush. 



T. linearis Rydb. 



Range : 4, 6, 7, 8, 9, 10, 13, 14. 

 Site: Dry, sun. 

 Fruit: Achene. 



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. Nuttall 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. Northern 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 ; 



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