sciftptfs. TRIANDRTA, MONOGYNIA. 47 



9. S. suhterminalis* : culm floating, silicate, inflated, 

 leafy below ; spike solitary, somewhat terminal, lanceolate ; 

 style 2-cleft ; seed triquetrous. 



Root fibrous. Culm 3 feet or more long, of a spongy texture ; 

 when dried, much roughened by the irregularly-contracting 

 medulla. Leaves very narrow, concave. Sfdke about as large 

 as in S. fialustris, shorter than the large bract (or rather con- 

 tinuation of the culm) at its base. Glumes ovate-lanceolate, 

 mucronate. Stamens 3. Style a little cleft. Seed large, 

 acutely triangular, surrounded by 6 bristles, which it nearly 

 equals in length. 



Hab. In ponds and streams of fresh water near Deerfield, 

 Massachusetts. Br. Coo ley. August. The whole plant, 

 except the spikes, is under water. 



10. S. ccespitosus L.: culms cespitose, terete; spikes 

 ovate, few-flowered ; lower glumes bracteiform, as long as the 

 spike; sheaths with rudiments of leaves. Sp,pLl\, IVilldc 

 Spec. I. p. 292. Vakl Enum. II. p. 243. Wahl, FL 

 Lcpp.ip. 13. Eng.Bot. t* 1029. Roem, ^ Schult. IL 

 p. 122. 



^. callosus Big, MS.: glumes thickened and carti- 

 laginous at the tips. 



JRoot fibrous, fasciculose. Culm about a span high, slender, finely 

 striate; lower part densely covered with imbricated sheaths, 

 Inferior sheaths marcescent, obtuse; the upper ones green, 

 producing a very short, obtuse leaf. Sfiike 4 — 5-flovvered, 

 compressed. Glumes yellowish-brown, obtuse; the 2 lower 

 ones resembling bracts ; the exterior a little longer, and the 

 other a little shorter, than the spike. Stamens 3. Style 3-cleft. 

 Bristles 6, smooth, longer than the germen. Ripe seed no' 

 seen. 



Hab. On the White Hills of New-Hampshire. Bigeloii? 

 and Bo 1 1. July. 



For specimens of this interesting plant I am indebted to 

 Prof. Bige I 01V. Though it differs in some respects from 

 the European species, it does not seem specifically distinct. 

 To S. cain/iestris it has much affinity. 



11. S. americanus Pers.: culm nearly naked, trique- 

 trous; sides concave; spikes lateral, (I — 5.) ovate, conglom- 

 erate, sessile ; glumes round-ovate, mucronate ; seed tri- 

 quetrous, acuminate. Pers. Syn.]. p. 68. Pursh FL L 

 p. 56. Elliott Sk, I, p. 80. Roem. ^ Schult. U. 

 p. 129. S. triqneter M icL FL I. p. 30, MuhL Gram. 

 p. 33. Big, Bosl, p. 14. 



