178 MISC. PUBLICATION 101, U. S. DEPT. OF AGRICULTURE 
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T. canescens inerm 
T. axillaris 
Ficurn 45.—Longspine horsebrush (TVetradymia azillaris), a range pest, and spine- 
less horsebrush (7. canescens inermis), a common but worthless and perhaps 
occasionally injurious western shrub 
Rush skeletonplant (Z. juncea) is hardly more than a perennial 
herb with a thickened, woody root and base, and tufted stiff rush- 
like branching stems 4 to 18 inches high. It ranges from Wisconsin 
to western Texas, Nevada, Idaho, and Saskatchewan, mostly in dry 
