IQ2 GRAMINEAE. 



13. Eragrostis hypnoides (L,am.) B.S.P. Creeping Eragrostis. (Fig. 440.) 



Poa hypnoides Lam. Tabl. Encycl. i: 



185- 1791- 

 Eragrostts reptans Nees, Agrost. Bras. 



5H- 1829. 

 Eragrostis hypnoides B.S.P. Prel. Cat. 



N. Y. 69. 1888. 



Culms I'-iS' long, extensively 

 creeping, branched, smooth and gla- 

 brous, the branches erect or ascend- 

 ing, i'-6' high. Sheaths shorter 

 than the internodes, villous at the 

 summit; ligule a ring of short hairs; 

 leaves 2' long or less, W-\" wide, 

 flat, smooth beneath, rough above; 

 spikelets dioecious, io-35-flowered, 

 2 // -8 // long; lower scales unequal, the 

 first one-half to two-thirds as long as 

 the second; flowering scales about 

 i% fr long, the lateral nerves promi- 

 nent; scales of the pistillate flowers 

 more acute than those of the stami- 

 nate. 



On sandy or gravelly shores, Ver- 

 mont and Ontario to Oregon, south to 

 Florida and Mexico. Also in the West 

 Indies. Aug.-Sept. 



66. EATON I A Raf. Journ. Phys. 89: 104. 1819. 



Tufted perennial grasses, with flat or involute leaves and usually contracted panicles. 

 Spikelets 2-3-flowered; the rachilla extended beyond the flowers. Two lower scales empty, 

 shorter than the spikelet, the first linear, acute, i-nerved, the second much broader, 

 3-nerved, obtuse or rounded at the apex, or sometimes acute, the margins scarious; flowering 

 scales narrower, generally obtuse. Palet narrow, 2-nerved. Stamens 3. Styles distinct, 

 short. Stigmas plumose. Grain free, loosely enclosed in the scale and palet. [In honor of 

 Amos Eaton, 1776-1842, American botanist.] 



A genus of 4 or 5 species, confined to North America. 

 Empty scales unequal, the first shorter and about one-sixth as wide as the second. 



Second scale obovate, often almost truncate. i. E. obtusata. 



Second scale oblanceolate, obtuse or abruptly acute. 2. E. Pennsylvania. 



Empty scales equal, the first not less than one-third as wide as the second. 3. E. nitida. 



i. Eatonia obtusata (Michx.) A. 



Gray. Blunt-scaled Eatonia. 



(Fig. 441.) 



Aira obtusata Michx. Fl. Bor. Am. i: 62. 

 1803. 



Eatonia obtusata A. Gray, Man. Ed. 2, 558. 

 1856. 



Culms i-2> tall, erect, simple, often 

 stout, smooth and glabrous. Sheaths shorter 

 than the internodes, usually more or less 

 rough, sometimes pubescent; ligule >^ // -i // 

 long; leaves i / -9 / long, I "-4" wide, scab- 

 rous; panicle 2'-6' in length, dense and 

 generally spikelike, strict, the branches \%' 

 long or less, erect; spikelets crowded, 

 i /< "-i>" long; empty scales unequal, often 

 purplish, the first narrow, shorter than and 

 about one-sixth as wide as the obtuse or 

 almost truncate second one; flowering scales 

 narrow, obtuse, #"-i" long. 



In dry soil, Massachusetts and Ontario to 

 Assiniboia, Florida and Arizona. June-Aug. 



