266 



CYPERACEAE 



13. Eleocharis montana (H. B. K.) R. & S. 

 Dombey's Spike-rush. Fig. 636. 



Scirpus montaniis H. B. K. Nov. Gen. 1: 206. 1815. 

 Eleocharis montana R. & S. Syst. 2: 153. 1817. 

 Eleocharis dombeyana Kunth, Enum. 2: 145. 1837. 



Eleocharis arenicola Torr. ; Engelm. & Gray, Bost. Tourn. Nat. Hist. 5: 

 237. 1847. 



Perennial by rootstocks ; culms slender, 1-4 dm. high, the 

 upper sheath truncate, usually 1-toothed. Spikelet oblong to 

 lanceolate-oblong, obtuse or acutish, 5-12 mm. long, 2-3 mm. 

 thick, densely many-flowered ; scales ovate, brown to yellowish, 

 obtuse or the upper acute ; bristles mostly as long as the achene 

 or somewhat longer; style 3-cleft; achene obovoid or oblong- 

 obovoid, trigonous, yellow-brown, 1 mm. long, tinely reticu- 

 lated or nearly smooth; tubercle conic, much shorter than the 

 achene. 



Wet soil, Sonoran Zones; Butte County, California, to Lower Cali- 

 fornia, east to New Mexico, San Luis Potosi. Louisiana and South Caro- 

 lina and Florida; Mexico to northern South America. Type locality: 

 Mount Quindiu, Colombia. I follow C. B. Clarke in reducing E. areni- 

 cola to E. montana, but now with some hesitation. 



14. Eleocharis acuminata (Muhl.) Nees. 

 Flat-stemmed Spike-rush. Fig. 637. 



Scirpiis acuminatns Muhl. Gram. 27. 1817. 

 Eleocharis acuminata Nees, Linnaea 9: 204. 1835. 



Perennial by stout rootstocks, similar to the pre- 

 ceding species but stouter ; culms flattened, striate, 

 slender but rather stiff, tufted, 0.2-0.5 m. tall. Upper 

 sheath truncate, sometimes slightly 1-toothed; spikelet 

 ovoid or oblong, obtuse, thicker than the culm, many- 

 flowered, 6-12 mm. long; scales oblong or ovate- 

 lanceolate, acute or the lower obtusish, purple-brown 

 with a greenish midvein and hyaline white margins, 

 deciduous ; bristles 1-5, shorter than or equaling the 

 achene, fugacious, or wanting; stamens 3; style 3-cleft, 

 exserted ; achene obovoid, obtusely 3-anglcd, light 

 yellowish brown, papillose, much longer than the 

 depressed-conic acute tubercle. 



Wet grounds, Transition and Boreal Zones; 

 (?) and British Columbia; Montana to Ontario, 

 Louisiana and Georgia. Type locality: not cited. 



Washington 

 New York, 



15. Eleocharis rostellata Torr. 



Beaked Spike-rush. 



Fig. 



638. 



Scirpus rostellattis Torr. Ann. Lye. N. Y. 3: 318. 1836. 



Eleocharis rostellata Torr. Fl. N. Y. 2 : 347. 1843. 



E. rostellata occidcntalis S. Wats. Bot. Calif. 2: 222. 1880. 



Perennial by a short caudex; culms slender, wiry, 

 the fertile erect or ascending, the sterile reclining 

 and rooting at the summit, grooved. 0.3-1.5 m. long. 

 Upper sheath truncate ; spikelet oblong, narrowed 

 at both ends, thicker than the culm, 10-20-flowered, 

 6-12 mm. long, about 2 mm. in diameter; scales 

 ovate, obtuse or the upper acute, green with a some- 

 what darker midvein ; bristles 4-8, retrorsely 

 barbed, longer than the achene and tubercle ; sta- 

 mens 3; style 3-cleft; achene oblong-obovoid, 

 obtusely 3-angled, its surface finely reticulated ; 

 tubercle conic-subulate, about one-half as long as 

 the achene or shorter^ capping its summit, partly or 

 entirely falling away at maturity. 



VV'et grounds, Transition and Sonoran Zones; southern 

 California to British Cohmibia, east across the continent to 

 Montana, Michigan, New Hampshire, and Florida; Bermu- 

 da; Cuba. Tv[ie locality: Penn Yan, Yates County, New 

 York. 



