Sedge Family 71 



stamens 3; style 3-cleft; achene obovoid-oblong, obscurely 3- 

 angled, with a rib on each angle and 6-9 intermediate ones, con- 

 nected by fine ridges; tubercle conic, acute, ^ as long as the 

 achene. 



Frequent in moist places along streams and on borders of ponds. April- 

 June. 



3. E. montana (H. B. K.) R. & S. Perennial ; stems slender, 

 sulcate, 15-45 cm. high, erect ; basal sheaths brown ; spike oblong 

 or sometimes ovate, 4-10 mm. long, rounded at the apex; scales 

 numerous, closely imbricated, ovate, very obtuse, brown with 

 green midvein, scarious margined; bristles 4-6, about equaling 

 the achene; style 3-cleft; achene obtusely 3-angled, oblong- 

 obovate, about 1 mm. long, greenish brown, smooth; tubercle 

 broad at the base and slightly constricted, deltoid, acute. (E. 

 arenicola Torr.) 



Frequent on river bottoms and borders of marshes throughout our range. 



4. E. rostellata Torr. Perennial ; stems rather slender, com- 

 pressed, strongly sulcate, 3-8 dm. high; often reclining and root- 

 ing at the apex ; basal sheaths light colored, truncate; spike ob- 

 long, 6-10 mm. long; scales straw-colored or pale brown, ovate, 

 obtuse, carinate and rather firm, about 4 mm. long; bristles 6, 

 exceeding the achene ; style 3-cleft ; achene obovate, obtusely 3- 

 angled, about 2 mm. long; tubercle not constricted at the base, 

 pyramidal, about 1 mm. long. (E. rostellata occidentalis Wats.) 



Frequent in marshes and on river bottoms about Los Angeles and San 

 Bernardino. 



4. FIMBRISTYLIS Vahl. 



Annual or perennial herbs with stems leafy below. 

 Spikelets umbellate, several-many-flowered, subtended 

 by 1-many-leaved involucre, their scales spirally imbri- 

 cated, mostly deciduous, all fertile. Perianth none. 

 Stamens 1-3. Style 2-3-cleft, pubescent or glabrous, its 

 base much enlarged, falling away from the achene when 

 mature. Achene lenticular, biconvex or 3-angled. 



1. F. thermalis Wats. Perennial by short matted rootstocks ; 

 stems 3-6 dm. high, flattened and somewhat roughened, striate; 

 leaves 2-4 mm. wide, flat, becoming more or less revolute, some- 



