. Bulletin of the Department of Agriculture. Agriculture; Agriculture. GENEEA OF GRASSES OF THE UNITED STATES. 93 37. Elymus L. Spikelets 2 to 6 flowered, sessile in pairs (rarely 3 or more or soli- tary) at each node of a continuous rachis, the florets dorsiventral to the rachis: rachilla disarticulating above the glumes and between the florets; glmnes equal, usually rigid, sometimes indurate below, nar- row, sometimes subulate, 1 to several nerved, acute to aristate, some- what asymmetric and often placed in front of the spikelets; lemmas rounded on the back or nearly terete, obscurely
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. GENEEA OF GRASSES OF THE UNITED STATES. 93 37. Elymus L. Spikelets 2 to 6 flowered, sessile in pairs (rarely 3 or more or soli- tary) at each node of a continuous rachis, the florets dorsiventral to the rachis: rachilla disarticulating above the glumes and between the florets; glmnes equal, usually rigid, sometimes indurate below, nar- row, sometimes subulate, 1 to several nerved, acute to aristate, some- what asymmetric and often placed in front of the spikelets; lemmas rounded on the back or nearly terete, obscurely 5-nerved, acute or usually awned from the tip. Erect, usually rather tall grasses, with flat or rarely convolute blades and ter- minal spikes, the spikelets usually crowded, some- times somewhat distant. Species about 45, in the temperate regions of the Northern Hemisphere; 25 species in the United States, most of them in the Western States. Type species: Elymus sihiri- cus L. Elvuius L., Sp. PI. 83, 1753; Gen. PI., ed. 5, 36. 1754. Lin- naeus describes five species, E. arenarius, E. sibiricus, E. can- adensis, E. virginicus, and E. raput-medusae, all of which iire still retuined in the genus. The first use of the name Ely- mus by Linnseus was in his Hortus Upsaliensis (1748), where two species are de- scribed, the first being cited in the Species Plantaruni inider E. virginicus the second under E. sibiricus. Elymus sibiricus is chosen as tlie type because it is the first of the five species in the Species Plantarum that is described ia the Hortus Upsaliensis. Terrellia LuneJi. Ainer. Midi. Nat. 4: 227. 1915. Proposed for Elymus L., not Elymus of various ancient authors. The asymmetric glumes, in many species standing in front of the spikelet instead of strictly distichous and in some species united at the very base, have been the object of investigations as to their morphological identity. Schenck^ considers them to be developed from lateral branches at the base of the .spikel
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