ORDER 154 CYPERACE^E. 363 



1 E. alpimim L. Culms jointlepe, Blender, 8 16', form a creeping rhizome; IVB. 



radical, short, subulate ; spk. 2", the white hairs at length 79" loner. Bogs, N., M. 



2 E. vaginatum L. Rigid, tufted, 1 2f, culm with 1 or 2 inflated sheaths; leaveg 



radical, filiform ; spk. 6 S", blackish, hairs 1', white, glossy, 3040 in each flower. 

 N. Bug. to Mich., and N. PoconoMt. in Penn. (Prof. Porter.) 



3 E. Virgaiiicum L. Culm strict, firm, slender, 2 3f, Ivs. shorter, narrowly lin- 



ear; invol. 2-4-lvd. ; spk. ovoid, 3", many, glomerate with very short ped. forming a 

 capitate cluster ; set* 70200, pale-cinnamon, 68" long. Bogs. 

 /3. confet'ttssimum. Setae white, in a large and compact tuft. N. H., N. Y., &Can, 



4 E. polystacfeloii L. Culms 1 2f, with 2 or 3 cauline broad linear Ivs. ; invol. 



2-leaved ; spk. about 10, on long drooping peduncles ; setae 3040 to each flower, 

 6 8", white. Very conspicuous in meadows and swamps. 



6 E. gracile Koch. Culm JJ--2f; Ivs. triquetrous, channelled above, scarce 1" wide; 

 spk. 38, on ronghish ped. which are V V 4' long; setae white, 8-10".. 



8. HEMICARFHA, Nees. Spike many-flowered. Glumes imbri- 

 cated all around. Interior scale 1, embracing the flower and fruit; setae 0. 

 Sta. 1. Style 2-cleft, not bulbous at base, deciduous. Ach. compressed, 



*oblong, subterete. (T) Low, tufted, with setaceous culms and leaves. 

 H. submquarrbsa Nees. Culms 23', curved, the Ivs. shorter; spk. 2 or 3, nearly 

 2", ovoid, sessile together; invol. 2-lvd., 1 continuing the stem; gls. svbfqnarrous. 

 Sandy shores. j3. ItrumnufndH. Sts. 12', spk. only 1. Fulton Co. 111. (J. Wolf.^ 



9. LIPOCARPHA, Brown. Spikes many-flowered; glumes spatu- 

 late, imbricated all around ; interior scales 2, thin, subequal, involving the 

 flower and coating the fruit. Perianth none. Sta. 1. Style 2- or 3-fid; 

 achenium coated with the scales. @ Culms leafy at base. Spikes numer- 

 ous, collected into an involucrate, terminal head. 



Li. maculata Torr. Culm 3 8', the linear-filiform Ivs. shorter; invol. of 2 long Ivs. 

 and 1 short; spk. 3 4. ovoid; glumes very GC, scarious, marked with red dotfl 

 and a green midvcin ; ach. oblong. Wet grounds, Phila. (Leidy), and S. 



10. FIMBRISTYLIS, Vahl. Glumes imbricated on all sides ; bristles 

 D. Style compressed, 2-cleft, bulbous at base, deciduous, ciliate-Jringed (as 

 the name indicates.) With the habit of Scirpus. Lvs. mostly radical. 



1 F. spadicea Vahl. Culms 1 3f, hard and rigid; lys. semiterete, rigid, chan- 



nelled ; rays few, exceeding the 2 or 3 invol. bracts ; spk. ovate-oblong, 36" by 2", 

 rust-colored to brown ; sta. 2 3 : ach. whitish, minutely netted, it Salt marshes. 



2 F. laxa Vahl. Culm 312', lax, flattened, striate ; Ivs. flat, linear, glaucous, rough- 



edged; rays few, shorter than 1 of the invol. bracts ; spk. ovoid, 3", brown ; sta. 1 ; 

 ach. whitish, with 6 8 prominent ribs. (T) Clay soils, Pa. to 111., and S. 



3 F. argentea Vahl. Glaucous, tufted; culms 26', setaceous, flattish, like the 



leaves ; spk. straw-colored, 6 9 in a dense head ; invol. Ivs. 4, longer than the culm; 

 gls. lance-ovate, pointed ; sta. 1. Philad. (A. H. Smith), and S. (F. congesta Torr.) 



11. TRICHELOSTYLIS, Lestib. Glumes in 4 to 8 ranks, carinate; 

 bristles none ; style 3-cleft, deciduous below the bulb (if any) at the base; 

 acheninm triangular. H. Sts. leafy at the base, tufted. Spikes in a 

 terminal head, or umbel, or solitary. 



Spikes rusty-brown, in a cymous umbel, the glumes 6 15, in 4 rows Nos. 1 S 



Spike* greenish x both capitate and umbellale, with linear Ivs. and bracts.. No. 4 

 x all capitate in a single head ; bracts dilated at base...Nos. 5, 6 

 x one only on each culm, or rarely 2 or 3, bracted Nos. 7, 8 



