160 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 
Podopogon Raf., Neogenyt. 4. 1825. Two names are given, " Stipa avenacea " 
L. and " barbata " Michx., both belonging to the same species. 
Pic. 93. — Porcupine grass, Stipa spartea. Plant, X I ; glumes and floret, x 2. 
