CYPEEACEAE. 1 85 



with a flat depressed border and a flattened conic acute projection. In wet sandy 

 soil, Del. to Fla. and Tex. June-Aug. 



4. Rynchospora alba (L.) Vahl. White Beaked-rush. (I. F. f. 651.) 

 Pale green ; rootstocks short; culms slender or filiform, glabrous, 1. 5-5 dm. tall. 

 Leaves bristle-like, 0.5-1 mm. wide, shorter than the culm ; spikelets in 1-4 dense 

 corymbose clusters, narrowly oblong, acute at both ends, 4-6 mm. long ; scales 

 ovate or ovate-lanceolate, white, acute; bristles 9-15, downwardly barbed, slender, 

 about as long as the achene and tubercle ; style 2 -cleft ; achene obovate-oblong, 

 smooth, pale brown, lenticular ; tubercle triangular-subulate, flat, one-half as long 

 as the achene. In bogs, Newf. to Alaska, south to Fla., Ky., Minn, and Ore. Also 

 in N. Europe and Asia. June-Aug. 



5. Rynchospora capillacea Torr. Capillary Beaked-rush. (I. F. f. 652.) 

 Culms filiform, glabrous. 1.5-5 ^ m - ta ^- Leaves filiform, less than 0.5 mm. wide, 

 much shorter than the culm ; spikelets few, in 1-3 loose cluster? oblong, acute at 

 both ends, 4-6 mm. long ; scales ovate-oblong, chestnut-brown, keeled, mucronate; 

 bristles 6, slender, downwardly barbed ; achene narrowly oblong, short-stalked, 

 light brown, minutely wrinkled, lenticular ; style 2-cleft ; tubercle compressed, tri- 

 angular-subulate, dark brown, about one-half as long as the achene. In bogs, Me. 

 to Ont. and Minn., south to N. J., Penn. and Mich. July-Aug. 



Rynchospora capillacea laeviseta E. J. Hill. Bristles smooth. N. Ind. and Mich. 



6. Rynchospora Knieskernii Carey. Knieskern's Beaked-rush. (I. F. f. 

 653.) Culms slender, smooth, 2-3.5 dm. ta ^- Leaves narrowly linear, flat, about 

 1 mm. wide, much shorter than the culm ; spikelets numerous, in several distant 

 compact clusters, oblong, acute, about 2 mm. long ; scales chestnut-brown, ovate ; 

 bristles 6, downwardly barbed, equalling the achene ; achene obovate, lenticular, 

 brown, minutely wrinkled; style 2-cleft; tubercle triangular-subulate, pale, one-half 

 as long as the achene or less. Pine barrens, N. J. to Va. July-Aug. 



7. Rynchospora glomerata (L.) Vahl. Clustered Beaked-rush. (I. F. 

 f. 654.) Rootstocks slender; culms smooth, triangular, 0.3-1 m. high. Leaves 

 flat, 2-4 mm. wide, rough-margined, shorter than the culm ; spikelets, in 3-7 

 corymbose-capitate axillary clusters, oblong, narrowed at both ends, 3-4 mm. long; 

 scales lanceolate, dark brown; bristles 6, downwardly barbed; achene obovate, len- 

 ticular, smooth, dark brown ; tubercle subulate, about as long as the achene. In 

 moist soil, Me. to Out., Mich., Fla. and Tex. July-Sept. 



Rynchospora glomerata paniculata (A. Gray) Chapm. Culm stouter, sometimes 

 1-1.1 m. tall; leaves usually wider ; spikelets numerous in compound clusters. Md. to 

 Fla. and La. 



Rynchospora glomerata minor Britton. Culms very slender, 1.2-2.5 dm. tall ; leaves 

 0.5 mm. wide or less ; clusters 2 or 3, small, with 3-10 spikelets. Mass. and N. H. 



Rynchospora glomerata discutiens Clarke. Bristles smooth, or barbed at the apex 

 only. N. J. to N. Car. 



8. Rynchospora axillaris (Lam.) Britton. Capitate Beaked-rush. 

 (I. F. f. 655.) Culms stout, 3-angled, 0.5-1 m. tall. Leaves flat, keeled, 2-3 mm. 

 wide; spikelets spindle-shaped, 5-6 mm. long, numerous, in several short-peduncled 

 axillary and terminal dense globose heads sometimes 2 cm. in diameter; scales 

 dark brown, ovate-oblong, acute; bristles usually 6, downwardly or upwardly 

 barbed; achene broadly obovate. brown, smooth, lenticular; tubercle subulate, about 

 as long as the achene. In swamps, L. I. to Fla. and La. July-Sept. 



Rynchospora axillaris microcephala Britton. Heads 8-10 mm. in diameter ; spike- 

 lets 3 mm. long ; achene one-half as large as that of the type. N. J. to Fla. and La. 



9. Rynchospora fusca (L.) R. & S. Brown Beaked-rush. (I. F. f. 656.) 

 Rootstocks short; culms 3-angled, smooth, 1.5-4.5 dm. tall. Leaves setaceous, 

 channeled, scarcely 1 mm. wide, much shorter than the culm; spikelets spindle- 

 shaped, acute, about 5 mm. long, in 1-4 loose clusters; scales oblong-lanceolate, 

 brown, shining, concave; bristles 6, upwardly barbed, often unequal; achene 

 narrowly obovate, turgid-lenticular, smooth, shining; tubercle triangular-subulate, 

 nearly as long as the achene. In bogs, N. B. to Del., west to Mich. Also in 

 Europe. July-Aug. 



