TRIAXDRIA MOXOGYNIA 19 



3. S. aitimnalis, 7>. Culm compressed, ancipital; umbel compound: 

 involucre mostly 2-leavcd ; spikelets lanceolate, acute, somewhat 4- 

 sided. Beck, Bot. p. 426 Speciw. Gray, Gram. 1. no. So. 



S. Mucronulatus. Mx. Am. 1. p. 31. 



S. Michauxii. Pers. Syn. l./>.68. 



Trichelostylis autumnalis. Torr. Scirp. in Ann. Lye. JST. V. 3. //. 



Autumnal Scibpc s. 



Jfowrf perennial, fibrous. Cu/w2or3to 12 inches high, two-edged, cespitose, leafy 

 at bass. Leaves grass-like, Hat, linear,acute, nerved, serrulate near the end, short- 

 er than the culm. Spikelets in compound or subpaniculate umbels; sometimes* 

 conglomerate in Lhrees, at the end <-f the branches, or rays. Involucre of -2 or 3- 

 unequal haves ; the longest about the length of the umbel. Glume* brown, ovate, 

 lanceolate, keeled, mucronate. Seed white, triquetrous, smooth. 

 Hub. Sandy swamps, and low grounds: Barrens : frequent. Fl. July.\FV. Au 



Oba. First observed in 1828, in this County. Dwarf specimens occur about VTest 

 Chester, with culms 2 to 3 inches long, and the spikelets pretty constantly con- 

 mcrated in threes. 



R>. Ovary invested -with Bristles. 



§ 3. Style 2 or 3-cleft ; base dilated or bulbous, arti< ulated to the seed, persistent. 

 Spikelet solitary, terminal. Bristles straight, mostly retrorsely hispid. Ellg 

 CilAKis. Br. 



4. S. palustrts, L. Culm naked, terete, inflated, shining; spikelet 

 oblong-lanceolate ; seed obovate, somewhat compressed, punctate-rugose. 

 Beck, Bot. p. 424. 



Eleocharis palustris. LindL Ency. p. 43. Torr. .Scirp. in Ann. Lye. 



.v. V. 3. p. 



Marsh Scibpus. Vulgo — Club-rush. 



Root perennial, creeping. Culm erect, leafless, 1 to 3 feet high, very smooth,. 

 round, slightly striate. Sheath long, embracing the lower part of the culm. 

 Spikelet sometimes oblique. Glume* rather obtuse ; lower ones larger, and often 



empty. Seed yellow ish, as long as the bristles, crowned with a conical tubercle,. 

 Bristles 3 OT 4, retrorsely hispid. 



Uab. Swampy meadows: Pughtown : rare. Fl. June. Fr. July. 

 Obs. Found by D. Townsbnd, Esq. in 1830. 



5. S. oBTrsrs, Willd. Culm naked, terete or somewhat compressed, 

 sulcate ; spikelet ovoid, obtuse ; seed obovate, compressed, smooth. 

 Willd. enum. {fide Torr.) Spbcim. Gray, Gram. 2. no. 132. 



S. ovatus. Muhl. Catalp. 6. Pursh? Jim. I. p. 54. Notl of Willd. 



Pers. &c. 



S. capitatus. Muhl. Gram. p. 30. A'tttt. Gen. 1. p. 32. Bart. Phil. 



l.p.3l. Ell. Sk. 1. p. 77. Bigel Most. p. 20. Torr. Fl. 1. p. 45. 



Florid. Cestr. p. 7. Beck, Bot. p. 424. Eat. Man. p. 328. Not ©f 



Linn. (Torr. in Lit t.) 



Eleocharis obtusa. Torr. Scirp. in Ann. Lye. J\\ Y. 3. p. 



Obtuse Scmrus. 



Root perennial, fibrous. Culm erect, 4 to IS inches high, cespitose, Leafless, 

 grooved, somewhat attenuated below the spikelet, sheathed at base ; sheaths about 

 2> retuse, mycrgnate. Spikelet e-voiJ, gfteu oblong and rtry obtuse, sometimes 





