30S 



Bulletin No. 205 



[March, 



V\". 73. — P, Imachucae 



this group were incorrectly referred by 

 the earlier American authors to P. pubes- 

 ccns Lam. or Michx. (that name being a 

 synonym of P. scoparium Lam.). P. 

 pubcscens, Engclmann ('44, p. 103) is 

 cited, but it is impossible to determine 

 which species he collected. 



Panicum huachucae Ashe 



(Figs. 73 and 74) 



Hitchcock and Chase '10, 214; Gates '12, 354. 



Culms 8 to 24 inches tall, erect and 

 stiff ; culms and leaves densely papillose- 

 pubescent ; nodes bearded with spread- 

 ing hairs; sheaths shorter than the in- 

 ternodes ; blades 1.5 to 2.5 inches long, 

 6 to 8 mm. wide ; ligules 3 to 4 mm. long ; 

 panicle axis and branches covered with 

 long hairs nearly to the end; spikelets 

 1.6 to 1.8 mm. long, densely pubescent. 



This species is usually light olive green 

 but generally tinged with purple, and 

 the spikelets are often purplish. The 

 plant is very stiff and harsh to the touch 

 from the abundance of hairs. The au- 

 tumnal form is much the same, tho the 

 culms are branched and the leaves much 

 shorter ; usually not much over an inch 

 in length. The panicles are very small 

 and almost hidden by the leaves. There 

 is considerable variation in the amount 

 of pubescence present. The species in- 

 tergrades with the subspecies P. liuacliu- 

 cac silvicola, which is apparently more 

 abundant in Illinois. 



CHRLSTiAN CO. Tavlorville, Andrews, Aug., 

 1898. COOK CO. East Side, Chicago, IWl, July, 

 1905; Palos Park, Umhach, June, 1909; Lan- 

 sing, A. Chanc, Juno, 1898; Beverly Hills-, A. 

 Chase, Juno, 1902 ; Washington Heights, Eoh- 

 crt Bcbb, Juno, 1902; Chicago, Somes, Aug., 

 1907; Chicago, Ilill in 1905. ford CO. Kemp- 

 ton, Wilcox, July, 1902. Henderson co. Oquaw- 

 ka, Patterson, knox co. "Willianisfield, V. U. 

 Chase 1858. lake CO. Beach, Umhach 22.37, 

 2244; Waueonda, mil in 1898; Rockefeller, 

 Gates, July, 1907; area north of Waukegan, 

 Gates; Waukegan, Gleason and Shohe, Aug., 

 ]90(). MACON CO. Elm Eidgo, Clol-ey 2435. 



