FEaTUCEiB. 625 



26. B. SECALiNus L. Sp. PI. 76 (1753). Chess. Cheat. B. 

 arvensis Oed. Fl. Dun. t. 293 (1769). B. badensis C. Gmel. Fl. 

 Bad. 4:75. t. 5 (1826). B. Billotii Sell. Bip. Fl. 32: 233 (1849). 

 B. Ehrharti Gaud. Eoem. Collect. 19. B. grossus D C. Fl. Fr. 

 3: 68 (1805). B. kordeaceus D C. Gmel. Fl. Bad. 4: 68 (1805-20). 

 B. maximus Gilib. Exevcit. 2:535. B. nitidus Dum. Obs. Gram. 

 Belg. 119 (1823). B. segetalis K. Braun, Nym. Consp. 822 (1878). 



An erect stout annual, nearly smooth, 30-120 cm. high. 

 Sheaths about the length of the interuodes; ligule 1.5 mm. longj 

 blades 4 in number ; scabrid above, 12-20 cm. long, 4-6 cm. wide. 

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

 longest 6-7 cm. long, bearing a few spikelets near the end. Sj^ikelets 

 compressed, oblong-ovate, 8-16 mm. long, 5-10-flowered; joints of 

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

 5 mm. long, second broadly oval, mucronate, 7-nerved, 6 mm. long; 

 floral glume broadly oval when spread, 7-9-uerved, 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. Eegarded by Bentham as only a variety or form 

 of B. arvensis L. 



Pennsylvania, Scrib)ier for U. S. Dept. Agricul, 749; Michi- 

 gan, Cooleij, Beal 148, 149, 151, Wheeler 150. 



Introduced from Europe and too common in fields of winter 

 wheat. 



27. B. RACEMOsus L. Sp. PI. Ed. 2:114 (1762). Chess. 

 Cheat. B. arvensis Knapp, Gram. Brit. /. 82 (1804), not L. 

 B. commufatus Sehrad. Fl. Germ. 1:353 (180G). B. agi-arius 

 Hornung, Steud. Norn. Ed. 2. ^. 226 (1841). 



An erect annual, 60-90 cm. high. Sheaths half or two-thirds 

 as long as the internodes; ligule 2 mm. long; blades and sheaths 

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

 mm. wide. Panicle narrow, about 15 cm. long, rays in tiirees, 

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

 Spikelet ovate-lanceolate, 6-10-flowered, 15-25 mm. long, joint of 

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

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



