ISOLEPIS. 



CYPERACEtE. 



361 



Torr. Cyp. p. 350. Scirpus capillaris, Linn. sp. 1. p. 49 ; Pursh, fl. I. p. 37 ; Muhl. 

 gram. p. 36 ; Torr. fl. I. p. 52 (excl. syn. Ell.) ; Bigel. fl. Bost. p. 23 ; Beck, hot. p. 426 ; 

 Darlingt. fl. Cest. p. 18. S. Muhlenbergii, Spreng. syst. 1. p. 207. 



Annual. Culms densely cespitose, very slender, 3-8 inches high, somewhat quadrangular. 

 Leaves mostly radical, 2-3 inches long ; the sheaths rather loose, membranaceous, hairy at 

 the throat. Umbel of 2 - 3 short setaceous leaves : longer rays of the umbel about half an 

 inch long. Spikes 2\ lines long, somewhat quadrangular, rather obtuse, one or sometimes two 

 of them sessile. Scales rusty brown with a green keel, slightly pubescent especially on the 

 margin. Achenium brown, abruptly contracted at the base, very obtuse, and crowned with a 

 minute depressed tubercle ; the angles very prominent. 



Sandy fields : frequent. FL July. Fr. August - September. This species belongs to 

 the genus Oncostylis of Martius and Nees. 



9. TRICHELOSTYLIS. Lestib. Cyp. p. 40 ; Torr. Cyp. p. 355. trichelostylis. 



[ From the Greek, trichion, hair, and stylos, style; the style being often hairy.] 



Scales mostly 4 - 8-ranked, keeled. Perigynium none. Style 3-cleft, more or less bulbous 

 at the base, deciduous below the bulb. Achenium triangular. — Culms simple, leafy at the 

 base, often flattened. Leaves mostly very narrow and channelled. Spikes usually in 

 terminal umbels or heads, rarely solitary. 



1. Trichelostylis mucronulata, Torr. Common Triclielostylis. 



Culm compressed, ancipital ; umbel more or less compound, spreading ; involucre 2-3- 

 leaved, shorter than the umbel ; spikes oblong, acute, solitary or 2 - 3 at the extremity of the 

 rays ; scales about 4 -rowed, ovate -lanceolate, mucronate, the points a little spreading ; 

 stamens 2 - 3 ; achenium broadly obovoid-triangular, smooth or minutely verrucose, convex 

 on the sides, the angles margined, — Torr. Cyp. p. 355 ; Nees, Cyp. in Endl. Mart. fl. 

 Bras. p. 79. Scirpus autumnalis, Linn. mant. p. 80 ? ; Pursh, fl. 1. p. 57 ; Ell. sk. 1. 

 p. 82 ; Muhl. gram. p. 37 ; Bigel. fl. Bost. p. 23 ; Beck, hot. p. 426 ; Darlingt. fl. Cest. 

 p. 19. S. mucronulatus, Michx. fl. 1. p. 31. S. Michauxii, Pers. syn. 1. p. 68. Fimbri- 

 stylis autumnalis, Rcem. <§■ Schult. syst. 2. p. 97 (in part). 



Culms cespitose, 2-12 inches high, often spreading or decumbent, rough on the edges. 

 Leaves flat, very acute, about a line in breadth, smooth ; the sheaths slightly bearded at the 

 throat. Umbel mostly decompound ; the rays about an inch long : secondary rays bearing 

 1-3 pedunculate rays, with one in the fork. Spikes about a line and a half long. Scales 

 rusty colored, prominently keeled. Style equally 3-cleft, bulbous at the base. Achenium 

 minute, whitish or pale brown, often covered (especially towards the base and summit) with 

 depressed capitate warts. 



Bogs and low grounds ; also on the sandy banks of rivers, rarely in dry situations : not 

 [Flora — Vol. 2.] 46 



