752 GRAMINE^E CATABROSA 



GRAPHEPIIORDM 



D. maritima Raf. 1. c. Glabrous throughout : stems 3 inches to 2 feet 

 high, erect, from horizontal rootstock, of ten decumbent at base : sheathe 

 shorter than the internodes, often crowded : ligules a ring of very short 

 hairs : leaves 3^-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-flowered, 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 1^-2^ 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 CATABROSA Beauv. Agrost. 97, t. 19, fig. 8. 



Perennial grasses with soft flat leaves and open panicles. 

 Spikelets usually 2-flowered. Two lower glumes empty, thin- 

 membranaceous, much shorter than 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. aquatica Beauv. Agrost. 157. Smooth and glabrous: stems erect, 

 from a creeping base, K~2 feet high, bright green, flaccid: sheaths usually 

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

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

 ing or ascending, very slender %-2 inches long, spikelets 1%-1% lines 

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

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

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

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

 41 GRAPHEPHORUM Deev. Bull. Soc. Philom. ii, 189. 



Erect grasses with flat leaves and usually contracted nodding 

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

 ed beyond 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. Wolfii Vasey Des. Cat. Gr. U. S. 66. Stems slender, 15-30 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, subs picate, 3-9 inches long: spikelets 2-4-flowered, 

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

 lines long the first 1-nerved, the second 3-nerved: flowering glumes 2-2% 

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

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

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

 tana and California. 



42 PANICULARIA 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. Spikelets 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. 



