SEDGE FAMILY. 

 4. Scirpus Clintoni A. Gray. Clinton's Club-rush. < 



Scirf>ns Clintoni A. Gray, Am. Journ. Sci. (I I. ) 38: 390. 

 1864. 



Perennial, culms tufted, triangular, very slender, 

 erect, 4 / -i5 / tall, roughish on the angles. Lower 

 sheaths imbricated, one or more of them bearing short 

 subulate blades, the upper one bearing a flat, narrowly 

 linear blade shorter than the culm; spikelet solitary, 

 terminal, ovoid, few-flowered, i>"-2" long, sub- 

 tended by a subulate involucral bract of less than its 

 own length or somewhat longer; scales ovate, pale 

 brown, acute; bristles 3-6, filiform, upwardly barbed, 

 as long as the achene or longer; style 3-cleft; achene 

 oblong, brown, sharply 3-angled, smooth, obtuse. 



In dry fields and thickets, New Brunswick to western 

 Ni-w York and Michigan, south to North Carolina. Local. 

 June-Aug. 



5. Scirpus planifolius Muhl. Wood Club rush. Vi K . 



Scirpus pla 



Gram 



Perennial, culms triangular, slender. tufted. nthjJT 

 weak, roughish on the angles, (/- 15' ull. Lower 

 sheaths bearing short subulate blades, the upper with 



a flat narrowly linear rough -margined leaf 

 long as the culm; spikelet solitary, terminal, 

 oblong, acute, several-flowered, subtended by short 

 involucral bract; scales ovate-lanceolate, yellowish - 

 brown with a green midvein, which is extended be- 

 yond the acute apex into a sharp cusp; bristles 4-6, 

 upwardly barbed, about equalling the achene; stamens 

 3; style 3-cleft, pubescent; achene oblong, 3 -angled; 

 smooth, light brown, rather obtuse. 



In woods and thickets, Rhode Inland to Dels aft. 

 western New York and Missouri. Mev-Jnly. 



6. Scirpus subterminalis Torr. 



Scirpus subterminalis Torr. Fl. U. S. x: 47. 1824. 



Perennial (?), aquatic, culms slender, terete, nodu- 

 lose, i-3^ long. Leaves slender, channeled, 6 / -2 

 l n gi X"-^" wide; spikelet solitary, terminal, ob- 

 long-cylindric, narrowed at each end, several-flow- 

 ered, 3"-5" long, subtended by a subulate erect invo- 

 lucral leaf Yz'-\ f long, thus appearing lateral ; scales 

 ovate-lanceolate, acute, membranous, light brown 

 with a green midvein; bristles about 6, downwardly 

 barbed, as long as the achene or shorter; stamens 3; 

 style 3-cleft to about the middle; achene obovoid, 3- 

 angled, dark brown, smooth, rather more than i" 

 long, obtuse, abruptly beaked by the slender base of 

 the style. 



In ponds and streams or sometimes on their borders, 

 New Brunswick to the Northwest Territory and Wash 

 ington, south to New Jersey, Pennsylvania and Michigan. 

 The so-called variety terrestris is an emersed form with 

 erect culms and shorter spikelets. July-Aug. 



Water Club-rush. (Fig. t 



