50 CYPERACEAE. 



pubescent branches about as long as the glabrous lower part; achene obovoid. 

 dull black, bluntly trigonous, nearly 1 mm. long, capped by a minute de- 

 pressed tubercle. 



Castle Island and Little Inagua. Endemic. WILSON'S STENOPHYLLTJS. 



4. FIMBRISTYLIS Yahl, Enum. 2: 285. 1806. 



Annual or perennial sedges. Culms leafy below. Spikelets umbellate or 

 capitate, terete, several to many-flowered, subtended by a 1-many-leaved in- 

 volucre, their scales spirally imbricated all around, mostly deciduous, all fertile. 

 Perianth none. Stamens 1-3. Style 2-3-cleft, pubescent or glabrous, its base 

 much enlarged, falling away from the summit of the achene at maturity. 

 Achene lenticular, biconvex, or 3-angled, reticulated, cancellate, or longitudi- 

 nally ribbed or striate in our species. [Greek, in allusion to the fringed style 

 of some species.] A large genus, the species widely distributed in temperate 

 and tropical regions. Type species: Fim'bristylis acuminata Vahl. 



Style branches 2 : achene lenticular. 



Achene longitudinally ribbed. 1. F. diphylla. 



Achpne cancellate, reticulate or granular, not ribbed. 



Scales pilose-puberulent ; leaves short. 2. F. fcrniginea. 



Scales glabrous. 



Leaves elongated : inflorescence loose. 



Leaves involute or plano-convex. 3. F. castancri. 



Leaves flat. 4. F. inaguensis. 



Leaves short : inflorescence compact. 5. F. spnthacca. 



Style branches 3; achene trigonous. 6. F. Inrta. 



1. Fimbristylis diphylla (Retz.) Yahl, Euum. 2: 289. 1806. 



Scirpiis diphyttus Eetz. Ob?. 5: 15. 1789. 



Perennial by short rootstocks, glabrous or pubescent; culms tufted, 1-6 

 dm. high, slender. Leaves 1-3 mm. wide, shorter than the culm; involucre- 

 bracts 3 or 4, shorter than or surpassing the simple or compound umbel ; spike- 

 lets oblong or ovoid, 5-10 mm. long, 2.5-4 mm. thick; scales ovate, acme, 

 glabrous ; style 2-cleft ; achenes scarcely 1 mm. long, obovoid, biconvex, white 

 or yellowish, longitudinally ribbed, reticulated, the ribs smooth. 



Moist soil, New Providence and Fortune Island : southern United States : 

 West Indies ; tropical continental America ; Old World tropics. SLENDER FIMBRI- 

 STYLIS. 



2. Fim'bristylis ferruginea (L.) Vahl, Enum. 2: 291. 1806. 



Scirpiis ferrugineus L. Sp. PI. 50. 1753. 



Culms tufted, erect, 2-8 dm. tall, rather slender. Leaves much shorter 

 than the culm, often very short; involucre-bracts 2-4, rarely exceeding the 

 simple <or slightly compound umbel; spikelets few or several, ovoid-oblong, 

 8-20 mm. long, 3-4 mm. thick ; scales ovate, acutish or mucronulate, brown, 

 pilose-puberulent toward the apex; style 2-cleft; achene obovoid, biconvex, 

 smooth, brownish, half as long as the scale. 



Moist saline soil. Berry Islands. Cat Cav, Andros, New Providence and 

 Eleuthpra to Mariguana and Inagua : West Indies ; continental tropical America. 

 SALT MARSH FIMBRISTYLIS. 



3. Fimbristylis castanea (Michx.) Yahl, Enum. 2: 292. 1806. 



Scirpus castaneits Michx. Fl. Bor. Am. 1: 31. 1803. 



Perennial; glabrous; culms stiff, slender, wiry, trigonous, 3-10 dm. high. 

 Leaves rigid, involute, usually somewhat shorter than the culm, about 2 mm. 

 wide when unrolled, their sheaths often brown, those of the involucre 3-6, the 



