GRASSES OF OHIO 303 



tween the teeth; palet rather firm, its two nerves close together; 

 grain free, loosely enclosed in the flowering glumes. 



1. Ammophila arenaria (L.) Link. Sand Beach-grass. A glab- 

 rous grass with erect, rigid, stout stems, 2-4 ft. high, from long 

 horizontal branching rhizomes, and with a dense, spike-like, com- 

 pressed panicle. Lemma scabrous, usually with a minute awn just 

 below the apex. 



On sandy beaches of the sea coast and the Great Lakes. July, 

 Aug. Erie County. 



41. Alopecurus L. Foxtail. 



Branching annual or perennial grasses with flat leaves, erect or 

 decumbent stems, and soft dense spike-like panicles. Spikelets 1- 

 flowered, flattened, falling from the axis entire ; empty glumes usually 

 somewhat united at the base, keeled ; lemma broad, obtuse, 5-nerved, 

 with a slender dorsal awn on the back; palet usually none. 



1. Lemma shorter than the obtuse, long-ciliate empty glumes ; empty glumes 

 less than % in- long. A. geniculates. 



1. Lemma as long as the acute long-ciliate empty glumes ; empty glumes y%-% 

 in. long. A. pratcusis. 



1. Alopecurus geniculates L. Marsh Foxtail. A grass, usually 

 glabrous, with slender, decumbent stems, simple or sparingly 

 branched, Yi-^Yi ft. high, and a slender spike-like panicle. Lemma 

 obtuse, glabrous, with an awn inserted about one-fourth above its 

 base. 



In wet soil. June-Aug. Lake, Ottawa, Crawford, Auglaize, 

 Madison, Franklin, Perry. Introduced. 



2. Alopecurus pratensis L. Meadow Foxtail. A glabrous grass 

 with slender, simple, erect stems, 1-2^ ft. high, from short, creeping 

 rhizomes, and with a spike-like panicle. Empty glumes united at 

 the base for about one-fourth of their length ; lemma obtuse, its awn 

 inserted about one-fourth above the base. 



In meadows and pastures. May, June. No specimens. From 

 Europe. 



42. Heleochloa Host. Cat-tail-grass. 



Low tufted branching annuals or perennials with flat leaves and 

 numerous spike-like panicles partly included in the inflated sheaths. 

 Spikelets 1-flowered, flattened; empty glumes subequal, membranous, 

 acute, ciliate keeled; lemma 1-nerved; palet shorter, 2-nerved ; grain 

 free, oblong, loosely enclosed in the flowering glumes. 



1. Heleochola schoenoides (L.) Host. Cat-tail-grass. A low, 

 cespitose, glabrous annual, usually almost prostrate, with branched 



