URDEK 154. CYPERACE^;. 363 



1 !<;. alpiuum L. Culms jointless, slender, 8 16', form a creeping rhizome; lvs 



radical, short, subulate ; spk. 2", the white hairs at length 7 9" long. Bogs, N., M. 



2 E. vaglnmtum L. Rigid, tufted, 1 2f, culm with 1 or 2 inflated eheaths; leave* 



radical, filiform ; spk. 6 S", blackish, hairs 1', white, glossy, 30 40 in each flower. 

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



3 E- Virgintcum L. Cnlm strict, firm, blender, 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* 70 200, pale-cinnamon, 68" long. Bogs. 



(3. foHfertiimimum. Setae white, in a large and compact tuft. N. II., N. Y., & Can 

 I E, polystachyon L. Culms l2f, with 2 or 3 cauline broad linear Ivs. ; invol. 

 2-'eaved ; spk. about 10, on long drooping peduncles ; seise 30 40 to each flower, 

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



E. graclle Koch. Culm l$--2f; Ivs. triquetrous, channelled above, scare* 1" wide; 



spk. 3 8, on roughish ped. which are 1" 1' 4' long ; setie white, S- 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. @ Low, tufted, with setaceous culms and leaves. 



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

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

 Sandy shores. 0. Itrumnnindii. Sts. 12', spk. only 1. Fulton Co. 111. (J. Woif.^ 



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

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

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

 Hchenium coated with the scales, (i) Culms leafy at base. Spikes numer- 

 ous, collected into an involucrate, terminal head. 



I.. iiiiK-ulata Torr. Culm 3 8', the linear-filiform Ivs. shorter; invol. of 2 long Ivs. 

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

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



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

 3. Style compressed, 2-cleft, bulbous at base, deciduous, ciliate-fringed (as 

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



1 F. spadicea Vahl. Culms 1 3t, hard and rigid ; Ivs. eemiterete, rigid, chan- 



nelled : rys 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. 11 Salt marshes. 



2 F. la.va Valil. Culm 3 12', 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. 

 8 F. argeiitea Vahl. Glaucous, tufted ; culms 2 6', 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. congests 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; 

 achenium triangular. @ U- Sts. leafy at the base, tufted. Spikes in a 

 terminal head, or umbel, or solitary. 



$ Spikes rusty-brown, in a cymons umbel, the glnmes 6 15, in 4 rows Noe. 18 



% Spikot gre-nish x both capitate and umbellate, with linear Ivs. and bracts. .No. 4 

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

 a; one only on each culm, or rarely 2 or 3, bracted Nos. 7, J 



