752 GRAMINEiE catabhosa 



GBAPHEFHOBDM 



it. maritima Kaf. 1. c, Glabrous throughout : stems 3 inches to 2 feet 

 high, erect, from horizontal rootstock, often decumbent at base : sheaths 

 shorter thd,n the internoijes, often crowded : ligules a ring of very short 

 hairs : leaves >^-9 inches long, 1-2 lines wide, flat or involute : panicle 

 dense and spike-like 1-3 inches long, the branches 1 inch long or less, erect : 

 spikelets 6-16-flDwered, 4-9 lines long, pale- green or purplish : empty 

 glumes acute.the first 1-3-nerved, % as long as the 3-2'nerved, second one: 

 flowering glume 1J^-2J^ lines long, acute or acuminate. In salt marshes 

 along the coast Brit. Columbia to California and in the interior, also on 

 the Atlantic coast. . . 



40 OATABEOSA Beauv. Agrost. 97, t. 19, flg.' 8. 



Perennial grasses with soft flat leaves and open panicles. 

 Spikelets usually 2-flowered. Two lower glumes empty, thi'ri- ' 

 membranaceous, much shorter thdh the flowering ones, unequal, 

 rounded or obtuse at the apex. Flowering glumes membranous, 

 erose- truncate. Palets barely shorter than the glume. Stam- 

 ens 3. Styles distinct, with plumose stigmas. 



C. aqnatica Beauv. Agrost. 157. Smooth and glabrous: stems erect, 

 from a creeping base, ^-2 feet high, bright green, flaccid: sheaths usually 

 longer than the internodes, loose : ligule lJ^-5 inches long, 1-3 lines wide, 

 flat, obtuse : panicle 1-8 inches long, open, the branches whorled, spread- 

 ing or ascending, very slender 3^-2 inches long, spikelets l^-\% lines 

 long, the empty glumes rounded or obtuse, the first about half as long, as 

 the second whiah is crenulate on the margins : flowering glumes 1-lJ^ 

 lines long, 3-nerved, erose-truhate at the apex. In .water or wet places, 

 Washington to Alaska and Labrador to Nebraska : also Europe and Asia. ~ 

 41 GRAPHEPHOEUM Desv. Bull. Soc. Philom. ii, 189. 



Erect grasses with.flat leaves and usually contracted nodding 

 panicles. Spikelets 2-4-flowered, flattened, the rachella prolong- 

 ed beyftnd the flower. Glumes 4-6, the 2 lower ones empty, 

 somewhat shorter than the flowering ones, thin-membranaceous, 

 acute, keeled. Flowering glumes membranous, obscurely nerved, 

 entire, sometimes short-awned just below the apex. Stamens 3. 

 Styles distinct, with plumose stigmas. Grain glabrous. 



G. Wolfil Vasey Des. Cat. Gr. U.S. 66. Stems slender, 16-30 inches 

 high, from a perennial root: sheaths about as long as the internodes: 

 ligules about a line long : leaves flat, scabrous, 6-10 inches long, 2-3 lines 

 wide: panicle erect, subspicate, 8-9 inches long :- spikelets 2-4-flowered, 

 purplish : rachella villoiis: empty glumes elliptical, nearly equal, about 3 

 fines long the flrst 1-nerved, the second 3-nerved : flowering glumes 2-2J^ 

 lines long, less than 1 line wide, obscurely 5- nerved, obtuse, lacerate, some- 

 times split or 2-toothed, bearing an awn )^ line long : palets shorter than 

 or nearly equalling the glumes. Dry rocky slopes, eastern Oregon to Mon- 

 tana and California. 



42 PANICULAEIA Fabr. Enum. Hort. Helmst. 373. (1763.) 

 GLYCERIA R. Br. (1810.) 



Mostly perennial grasses with flat leaves and numerous spike- 

 lets in more or less open panicles. Spikelefs 2-20-flowered, terete 

 or sometimes flattened. Two lower glumes empty, obtuse or 

 acute, 1-3-nerved : flowering glumes membranous, rounded on 

 the back, 5-9-nerved, the nerves disappearing in the hyaline apex. 



