110 MINNESOTA BOTANICAL STUDIES. 



HORDEUM LiNN, Syst. ed. I. 1735. 



Cuviera Koel. Gram. 328. 1802. 

 Zeocriton Beauv. Essai Agrost. 114. 1812. 

 Critesiou Raf. in Journ. Phys. 89: 103. 1819. 

 Critho E. Mey. Ind. Sem. Hort. Regiom. 5. 1848. 



Hordeum nodosum Linn. Sp. PI. Ed. II. 126. 1762. Wild 

 Barley. 



H. viurinimi var, B. Linn. Sp. PL 85. 1753. 



H. secaZmum ScHREB. Spicil. Fl. Lips. 148. 1771. 



H.pratense Hudson. Fl. Angl. Ed. II. 56. 1778. 



H. maximum Vill. Fl. Delphi n. 10. 1785. 



H. maritimum Roth. Tent. Fl. Germ. 2. pt. i: 150. 1789. 



Zeocriton secalinum Beauv. Essai Agrost. 115. 1812. 



H. pusillum NUTT. Gen. ,1 : 87. 1818. 



H. sibiricum Link. ex. Steud. Norn. Ed. II. 1 : 775. 1840. 



H. brevimbulatum Link, in Linniea 17: 391. 1843. 



H. nodosum C. Koch, in Linna?a 21: 432. 1848. 



H.pratense Linn. var. nodosum Led. Fl. Ross. 4: 329. 1853. 



Perennial or biennial; stems 2 to 9 dm. in length, erect or 

 geniculate below; leaves 8 to 20 cm. in length; sheaths varying 

 from nearly glabrous to hairy; blades 2 to 7 mm. broad, scabrous 

 or roughened both above and below, flat or involute, often 

 shorter than the sheaths; inflorescence 2 to 6 cm. in length, 

 dense, fragile when mature; spikelets in threes, 1 flowered, the 

 lateral ones aborted; empty glumes all capillary or setaceous, 6 to 

 15 mm. in length; flowering glumes of the aborted flowers 2 to 5 

 mm. in length, subulate, acuminate or short awned, those of 

 the perfect flowers lanceolate 5 to 10 mm. in length, 1 to 3 

 nerved, scabrous at the tip, with awns 6 to 15 mm. in length. 



Europe and Asia; cosmopolitan. 



North America: Ohio, 111., Minn., Neb., Nev., Colo., Utah; 

 N. to Or., Wash, and B. C. ; S. to southern Cal. and Tex. 



Minnesota: Reported from Blue Earth county, rare or local 

 along the southern border of the state. 



Hordeum jubatum Linn. Sp. PI. 85. 1753. Squirrel Tail 

 Grass. 



CritesiumgeriiculatumKAF. J onr.Fhys. S9: 103. 1819. 

 Elymus jubatus Link. Enum. Hort. Berol. 1: 19. 1821. 

 Elymus lechleri Steud. Syn. PI. Gl. 430. 1855. 



Biennial; stems 3 to 6 dm. in length, smooth, geniculate or 

 somewhat prostrate; leaves 1 to 2 dm. in length; sheaths smooth, 

 as long as the blades; blades 2 to 3 mm. broad, smooth or some- 

 what roughened, scabrous on the margins; inflorescence 4 to 10 



