394 CYPERACE^. 



slender, mostly longer than the ovoid acutely triangular achenium ; tubercle 

 very minute or almost wanting. Scirpus pusillus Pursh, not of Vakl. 



Salt mar.shes. N. Y. and N. J. July, Aug. 1\..—Culm 1—2 inches high, 

 often destitute of spikes. Spikes 3— 8-flowered, only 1 or 2 flowers perfect 

 Bristles sometimes wanting. Dwarf Spike Rush. 



13. E. microcarpa, var. filicidmis Torr. : culms cespitose, capillary or 

 filiform, quadrangular, wiry ; spikes oblong ; bristles nearly as long as the 

 obovate-oblong achenium ; tubercle very minute, closely sessile. 



Wet places in the Pine Barrens of N. J. %.— Culms 3—4 inches high, not 

 thicker than a hair. S/nke about 2 lines long. Scales dark chestnut color. 



Wiry-sialkfid Spike Rush. 



6. SCIRPUS. Linn.— Clnh Rush. 

 (An ancient Latin name for the Bulrush, which belongs to this genus.) 



Spikes many-flowered, the scales imbricate on all sides. 

 Bristles 3 — 6, rigid, persistent. Style 2 — 3 -cleft, simple at 

 base, deciduous. Achenium biconvex or triangular. 



* Spike solitary, terminal. 



1 . S'. ccespitosus Linn. : culms cespitose, fiHform, terete ; the sheaths with 

 rudiments of leaves ; spike ovoid, few-flowered ; the two lowest scales 

 bract-like, as long as the spike ; bristles smooth : style 3-cfeft ; achenium 

 obtusely triangular. 



Wet places. White Hills, N. H. Big. High mountains of Essex cotmty, 

 N. Y. Torr. N. to Arct. Amer. W. to the Rocky Mountains. July. % — 

 Culm 2 — 10 inches high, rather rigid, finely striate, with imbricate sheaths at 

 base. Spike 4. — 5-flowered, a little compressed. <ScaZes yellowish-brown. 



Scaly-stalked Club Rush. 



2. (S. planifolius Muhl. : culm triangular ; leaves linear, flat, about as 

 long as the culm ; spike oblong, compressed ; scales carinate, cuspidate, 

 the lowest one longer than the spike ; achenium triangular. 



Wet grounds. N. Y. and Mass. to Del. June. %. — Culms 6 — 12 inches 

 long, cespitose, rough on the angles. Leaves subradical, grass-like, rough on 

 the margin. Scales yellowish, with a green keel. Bristles 4 — 6, nearly as long 

 as the achenium. Flat-leaved Club Rush. 



3. S. subterminalis Torr. : culm floating, sulcate, leafy at the base ; 

 spike oblong-lanceolate, shorter than the bract at the base ; scales ovate- 

 lanceolate ; style 3-cleft ; achenium triangular. 



Slow flowing streams. N. Y. Mass. and N. J. W. to the Rocky Mountains. 

 Aug. %. — Culm 3 feet long, growing under water. Leaves long, filiform, 

 channelled. Spike emersed, with a narrow bract at base. Bristles 6, rigid, 

 nearly as long as the achenium.- Floating Club Rush. 



** Culm many-spiked. 

 ■f- Spikes lateral. 



4. *S. debilis Pursh. : culm terete, v^dth a few subulate leaves at base, 

 striate ; spikes 3 — 5, ovoid, closely sessile, below the top of the culm ; scales 

 broad-ovate, obtuse, mucronulate ; style 2 — 3-cleft ; achenium plano-convex, 

 broad-obovate. 



