52 TRIANDRIA— MONOGYNIA. Rhynchospora. 



1. S. Jiigrica?is. Black Bog-rush. 



Stem round, naked. Head roundish, abrupt, overtopped 

 by one of the two floral leaves. 



S. nigricans. linn. Sp. PL 64. Willd. v. 1.261. Vahl Enum.v.2. 



208. Fl. Br. 43. Engl. Bot. v. 16. 1. 1121. Hook. Scot. 10. 



Don H. Brit. 51. Schrad. Germ. v. 1. 1 13. 

 Cyperus nigricans. JF#/t. 78. 

 C. n. 1347. Hall. Hist. v. 2. 181. 



Juncus leevis minor, panicula glomeratfi nigricante. Raii Syn. 430. 

 J. lithospermi semine. Magn. Monsp. 145. t. 144. 

 J. capitatus lithospermi semine. Moris, sect. 8. t. 10./. 28. 

 Junco affinis, capitulo glomerato nigricante. Scheuehz. Agr. 349. 



t.7.f. 12, 13, 14. 



On turfy bogs. 



Perennial. Jw?e. 



/?oo£ of very long strong fibres, crowned with black, shining, erect, 

 folded sheaths, a few of which bear very narrow, acute, upright 

 leaves, convex beneath, and embrace the bottom of the simple, 

 rigid, otherwise naked, stem, which is from 8 to 12 inches high. 

 Head black. Anth. long, prominent, yellow. Stigm. 3, dark 

 purple. Seed white and polished, with a few narrow rough 

 scales below the base, arising from the elongated receptacle, 

 represented in Engl. Bot. but overlooked by Vahl and Schrader. 



23. RHYNCHOSPORA. Beak-rush. 



Vahl Enum. v. 2. 229. Br. Pr. 229. 

 Nat. Orel, see n, 22. 



Spike of 2 or 3 perfect Jlowers, subtended by numerous, 

 gradually smaller, empty, crowded glumes. Gl. all im- 

 bricated in every direction, concave, pointed. Cor. none. 

 Filam. 1, 2 or 3. Anth. linear, erect. Germ, superior, 

 roundish, small, with several rough bristles, shorter than 

 its glume, beneath. Style capillary, with a broad base, 

 which remains, forming a hard, conical, compressed, pale 

 beak to the convex, otherwise obtuse, seed. 



Stems erect, simple, leafy, triangular. Leaves keeled, with 

 entire sheaths. Spikes in corymbose, stalked heads. Fl. 

 sometimes partly monoecious, according to Vahl. 



1. R. alba. White Beak-rush. 



Heads abrupt. Stamens two. Leaves tapering. Numerous 

 bristles at the base of the seed. 



R. alba. Vahl Enum. v. 2. 236. 



