FESrUCE.E. 625 



26. B. SECALiNusL. Sp. PI. ro (1T5;3). Ciikss. Cheat. B. 

 arvensis Oed. Fl. Dau. t. 293 (Koy). B. baiknsis C. Gruel. Fl. 

 Bad. 4:75. t. 5 (183G). B. Billotii Scli. Bip. Fl. 3:2:333 (ISIO). 

 B. Ehrlmrfi Claud. Itoem. Collect. 10. B. (jrosaus D C. Fl. Fr. 

 3: 08 (1805). B. honlmreus D C. Gmel. Fl. Bad. 4: GS (1805-:i(;j. 

 B. via.n'miis Gilib. Exercit. 2:535. B. ttHidtiH Dum. Ob.s. (Jrain. 

 Belg. llt)(18;23). B. scijvfalisA. liraun, Xym. Consp. S?Jl (1878). 



All erect stout annual, nearly smooth, 30-120 em. liiuii. 

 Sheaths about the length of the internodes; ligule 1.5 mm. long; 

 blades 4 in iiumber; scabrid above, 12-20 em. long, 4-0 cm. wide. 

 Panicle oblong, 8-18 cm. long, rays in threes, fours, and fives, the 

 longest 0-7 cm. long, benring a few spikelets near the end. Spikelets 

 compressed, oblong-ovate, 8-lG mm. long, 5-10-llowereil; joints of 

 rachilla nearly 2 mm. long, first empty glume ovate-acute, 3-nerved, 

 5 mm. long, seeoiul broadly oval, mucroiuite, 7-nerved, mm. long; 

 floral glume broadly oval when spread, 7-i)-nerved, at length coria- 

 ceous, 7 mm. long, awn variable, usually 5 mm. or less long; palea 

 as long as its glume, pectinate-ciliate. Grain in section shaped 

 like a horseshoe. Kegarded 1)y Bentham as only a variety or form 

 of B. arrrnsis L. 



Pennsylvania, SrrUnicr for U. S. Dept. Agricul. 749; Michi- 

 gan, Conlcy, Bcdl 148, 149, 151, W/icekr 150. 



Introduced from Europe and too common in fields of winter 

 wheat. 



27.15. KACKMOsus L. Sp. PI. Ed. 2:114 (1702). Cjirss. 

 CiiKAT. B. (inriisis Knap[), Gram, lirit. /. 82 (1804), not L. 

 B. comnmtatns Schrad. Fl. (ierm. 1:353 (1800). B. af/rariiis 

 Ilornung, Steud. ^'om. Ed. 2. t. 22G (1841). 



An erect annual, 00-90 cm. high. Sheaths half or two-tliirds 

 as long as the internodes: ligule 2 mm. long; blades and slu'aths 

 smooth or more often pubescent, 4 in number, 8-15 cm. long, 3-6 

 mm. Avidc. Panicle narrow, about 15 cm. long, rays in threes, 

 fours, and fives, the longest 4-5 cm. long, besides the spikelet. 

 Spikelet ovate-lanceolate, G-10-flowercd, 15-25 mm. long, joint of 

 rachilla nearly 2 mm. long; empty glumes oval, acute, nearly 

 smooth, first 3-uerved, 6 mm. long, second 7-nerved, 8 mm. long; 



