428 



POACE.E. 



habit of Paiiicinn cnlonunt. A /]:enus contiiinin<j^ only one species, 

 wliicli 1ms a very wide range It is found in southern Euroj)e, 

 temperate Asia, and North A'.nerioa. 



1. B. erucaeformis uniflovus Seribn., \'asey, Descr. (Jat. Gram. 

 U. S., 8 (1885), name only. 



Annual; culms rather stout, simple, GO-i)0 cm. high. Ligule 

 elongated; blades roughish, 10- '^0 em. long, 5-8 mm. wide. Pani- 

 cle 10-30 cm. long, rays single or in twos or threes, 1.5-4 cm. 



long. Spikelets 1-llowered, nearly orbicu- 

 lar or broadly obovate. 2.5-3 mm. long, lirst 

 and second glumes with 3 principal nerves 

 and some transverse nerves. 



Ontario, Foic/cr ; South Dakota, 7^ ////>•//; 

 Colorado, ('(i,s.si(?i/; Montana, Andcrxou; 

 Washington, Lak-v; Oregon, /lo/rell. 



Mountain regions mainly west of the 

 Mississippi. A grass of some prominence as 

 u forage plant for certain localities. 



Bei'Jcnuiiniia has been usually i)laced in 

 PhalaridCiT, but lieutham believed it be- 

 longed to Panicew. The habit and inflo- 

 rescence are those of Pdiiicum colonum; but 

 it is exceptional in Panicea3 as having botli 

 the flowers perfect; the lower flower is, 

 however, usually sterile. A similar character 

 is to be found in some of the species of ,Sefa- 

 n'a, and very rarely in Fanicum itself, next 



A 



Fig. 77. — Beckmnnnin 

 erucd'formis uniflorus. 



Splkelot dissected. ^^ Avbich the genus appears to be ])laced in 

 (Scnbuer.) o 1 1 



Chloridea^. 



92. (191). EleusinE G»rtn. Fruct. 1:7, ^ -? (1788). Dactij- 

 locfenium Willd. Enum. Hort. Berol. 1029 (1809). Acrachnc 

 AVight & Arn. Liiull. Introd. Nat. Syst. Ed. 2, 381 (1830). 



Spikelets several-flowered, flat, imbricate in 2 rows on one side 

 of the digitate or scattered branches of a simple panicle, rachilla 

 articulate above the outer glumes, flowers perfect or the upper one 

 stamiuate. (Humes spreading, keeled and conduplicate, thin but 



