AtH{«»srii>i;.K. a<>:{ 



l()-»»Ocin. liijjh. Slu'uths not crowded from tin- intcinodcs: li^'uU> 

 very Hln)rt; Idiidos ;j. Ilat, 1(»-IS i-ni. I<»ll;.^ I'miiclforifii on a pcdi- 

 i-r\ of its own l«'n;,'tli. spiki'liki', iiiti'rniptcd, the a|i|ircss('d ray.s 

 riHistly iit coiiiilcs. S|.ikcU-l.s S nun. lon;^ to tlio tips of tiii' siilt- 

 t((ual. l-iU'i'Vfd, i-inpty j.'lunie-»; lloivt 4.5 mm. lou^j; tlio lalt-ral 

 awMs lu mm. loii)^', tl>o central one a third lon^jfor. 



New .Icrsey, ./. //. I/in'mis for Nat. Miis. N'asey says it has 

 liccn chi>-i'd with .1. ///v/</7/.v. and with forms (»t" J. /tin /mm', lnit 

 it is prolialdy 'I'rinius* old spirii'S. ll mnch rcsenihKs .1. aliirhi 

 Michx. 



IH. A. Humboldtiana 'I'rin. and Knpr. Mem. Acad. St. reter>l>. 

 (VI.) : : lis (lS4;t). .1. ,li,'(irir,ihi 11. H. K. Willd. Knum. '.)!• 

 (I80!l). Clnrliuiii dirarini/,/ Heauv. ,\,u'rost. :{() (IST.'). 



An erect {jniss. :)(>-!M) cm. hi;,'ii. Shcalhs cowriii;,' the nodes; 

 Mades eonvolntc. ri«rid. l','-*^()cm. lon^'; li;/nle ciliate, short. I'ani- 

 (tlc often partially included. "^O ;5(> cm. '.oii.i,', narrow or widely 

 spreading;; rays mostly in twos helow, sinjjle ahove. some of them 

 10- ri cm. lon<;, sparsely flower-hearinj; alon<; the upper two-lifths. 

 Kni|)ty ^ilunies purplish. 1 -nerved, ecpial. or the lower a little tlu' 

 lon^jfi'r. about 1"' mm. lonjf, liesides a very short awn; florets often 

 seal)ri(l and spotted, '.» mm. lon<f, .some of them sterile and shorter: 

 awns erect, the lateral oiu's ahout as lon<>- as the spikeh't. the cen- 

 tral one 'i-G mm. lon^ror; paK-a 1 mm. lonjjj. 



.Mexico, /'(thiiir '^S4. KiS; Arizona, Toitnii'ij 7H4; California, 

 Junes; New Mexico, \'<isci/. 



New Mexico, Arizona to California. 



1!>. A. lanata Poir. Encycl. Sujipl. 1:4.5:) (ISIO). Chwhirid 

 f/(>f<ni//n')ia lieauv. Agrost. 30 (1S1',»). ArisliilK hniasK Muhl. 

 (Jram. IT4 (1817). 



An erect rather stout perennial. (JO-r^O cm. high. Sheaths 

 covering the nodes, often woolly; ligule very short; blades :{ or 

 more in number, rough or smooth above, smooth below, rigid, 

 usually becoming involute. 30-00 rm. or more long, I'aniclemuoh 

 exserted, ;J0--60 cm. long, sjiikelike; rays in couples, some of them 

 10-15 cm. long, tlower-bearing alojig the upper two-thir<ls. Empty 

 glumes with scabrous keels and straight awns, l-Z mm. long, the 



