Genus 7. 



SEDGE FAMILY. 



33 1 



12. Scirpus mucronatus L. Bog Bulrush. 

 Fig. 812. 



Scirpus mucronatus L. Sp. PI. so. 1753. 



Perennial, culms stout, somewhat tufted, sharply 

 3-angled, smooth, i°-3° tall. Spikelets 5-12 in a 

 capitate cluster, oblong, obtuse, many-flowered, 4"-o/' 

 long, rather more than 1" in diameter, subtended by 

 the solitary linear abruptly spreading involucral leaf ; 

 scales broadly ovate, obtuse, light brown with a nar- 

 row green midvein, mucronate; bristles 6, stout, 

 rigid, downwardly barbed, as long as the achene; 

 stamens 3; style 3-cleft; achene obovoid, smooth, 

 shining, dark brown, 3-angled, two of the sides nar- 

 rower and more convex than the third. 



In a swamp in Delaware county, Pennsylvania. Prob- 

 ably adventive or fugitive from Europe. Widely distrib- 

 uted in the Old World. July-Sept. 



13. Scirpus etuberculatus (Steud.) Kuntze. Canby's Bulrush. Fig. 813. 



Scirpus maritimus var. cylindricus Torr. Ann. Lye. N. Y. 



3: 325- 1836. 

 Rhynchospora etuberculata Steud. Syn. PI. Cyp. 143. 



1855. 

 5". Canbyi A. Gray, Am. Journ. Sci. (II.) 38 : 289. 1864. 

 5. etuberculatus Kuntze, Rev. Gen. PI. 758. 1891. 

 5". cylindricus Britton, Trans. N. Y. Acad. Sci. n : 79. 



1892. 



Perennial by stout rootstocks, culm stout, sharply 

 3-angled above, 3°-6° high, the linear nodulose 

 keeled and channeled dark green leaves nearly or 

 quite as long. Involucral leaf solitary, 4'-lo' long, 

 erect; spikelets in an apparently lateral simple or 

 compound umbel, drooping, oblong-cylindric, acutish, 

 6"-io" long; primary rays of the umbel 1-4' long, 

 bracted by 1 or more subulate-linear leaves; scales 

 ovate or ovate-lanceolate, pale brown with scarious 

 margins, acute, mucronulate; bristles 6, stout, rigid, 

 about as long as the achene, serrate; stamens 3; 

 style 3-cleft ; achene obovoid, 3-angled, light brown, 

 smooth, abruptly subulate-pointed. 



In ponds and swamps, Maryland to Florida and Louis- 

 iana, mostly near the coast. Pole or Pool-rush. July- 

 Sept. 



14. Scirpus validus Vahl. American Great 

 Bulrush. Mat-rush. Fig. 814. 



Scirpus validus Vahl, Enum. 2 : 268. 1806. 



Perennial by stout rootstocks, culm stout, terete, 

 smooth, erect, 3°-g° tall, sometimes nearly 1' in diam- 

 eter, sheathed below, the upper sheath occasionally ex- 

 tended into a short leaf. Involucral leaf solitary, erect, 

 shorter than the umbel, appearing as if continuing the 

 culm; umbel compound, appearing lateral, its primary 

 rays slender, spreading, 4'-2i' long, bracts linear-lanceo- 

 late, pubescent ; spikelets oblong-conic, sessile or some 

 of them peduncled, in capitate clusters of 1-5, obtuse 

 or acute, _2i"-6" long, ii"-2" in diameter ; scales ovate 

 to_suborbicular,_slightly»pubescent, with a rather strong 

 midvein which is sometimes excurrent into a short tip ; 

 bristles 4-6, downwardly barbed, equalling or longer 

 than the achene; stamens 3; style 2-cleft; achene plano- 

 convex, obovate, nearly as long as the scale, gray to 

 brown, abruptly mucronate, a little more than ii' wide. 



_ In ponds and swamps, throughout North America, except the extreme north, and in the West 

 Indies. The Old World S. lacustris L., with which our plant has been confused, has a 3-cleft style. 

 Black-rush. Bolder or Boulder Bast. Tule. June-Sept. 



