ORDER CXLI, CYrKRAC.K.i:. 5G3 



panicles, pendulous. Seed compressed, sui-roundod l)y efabmus bristles. 



— If. Through the summer. Wet soils. 1 — 2 ft-et. 



8. R. seta'cea, (Viihl.) {R. rarlfora, Kll.) Slan leafy, setaceoug. 

 Leaves glabrous, setaceous. Flowers in lateral and ternnnal panicles. 

 Glumes 5 — 7 ; the exterior ones smallest, the two interior resembling 

 paleffi. Bristles 3 — 4. — y. April — May. In bogs. Common. 10 — 

 12 inches. 



9. R. spar'sa, (Vahl.) Stem triangular, erect. Leaves linear-lanceo- 

 late, glabrous, serrulate. l<V,oiccrs in diffuse axillary panicles. Seed 

 rough, surrounded by bristles. — 2f . Wet soils. May — Aug. 1 — 2 ft. 



10. R. CADu'cA, (Ell.) Stem triangular, erect. Leaves linear-lanceo- 

 late, glabrous, serrulate. Flowers in axillary panicles ; spikelets ses- 

 sile. aSVco? rough, surrounded by bristles. — If. July — August. Damp 

 soils. 1 — 2 feet. 



11. R. Elliott'ii, (Dietr.) (Scirpus sckoenoides, Ell) Stem triangu- 

 lar, glabrous. Leaves linear, short. Spikes ovate-lanceolate, clustered, 

 numerous, arranged in a comj^ound jianicle. Glumes ovate, ferruginousi 



— If. July — Aug. In low country. 2 — 3 feet. 



Genus XII.— DULICH'lUM. Pers. 3—1. 

 (The name of an island.) 



Spikes somewhat racemose, axillary ; spikelets linear-lanceo- 

 late, compressed. Glumes distichous, sheathing. Style very 

 long, 2-cIeft. Nat with bristles at tiie base. 



1. D. spatha'ceum, (Rich.) Stem striate, columnar, terete at the 

 base, triangular above. I^eaves linear-lanceolate, pointitig in 3 direc- 

 tions; spikelets spreading, 6 — 7-flowered, forming axillary racemes. 

 Peduncles as long as the sheaths of the leaves. 



Tribe IV.— SCLERIN'E.E. 



Spikes monoecious; fertile spikelets 1-flowered, sUiminate 

 several-flowered ; achenia nut-hke, globular. 



Genus XIIL— SCLE'RIA. 19—3. 

 (From sklej'os, hard ; the fruit is hard.) 



Flowers monoecious. Sterile florets; glumes 2 — 6, maiiy- 

 •iowered ; palea3 unawned. Fertile florets; glumes 2 — G, 1- 

 flowered ; palese none. Stigmas 1 — 3. Seed sul>-g!obose. 



1. S. pauoiflo'ra, (Muhl.) {S. oU^jautha, Mich.) Stem slender, 3-nn- 

 gled, glabrous, sliglitly pubt;seent at the Minimit. Leaves linear, slight- 

 ly pubescent at the base, scabrous <in the upper surface. Fluxcrn in faj»« 

 cicles or spikes, 2 — 3, sessile near the sununit, one on a long jHiduncle. 

 Fertile florets at the summit; sterile at tiio base. Seed white, .-tin'oflL 

 — U. May — June. Pine-barrens. 12 — 18 inches. 



Var. Stem slender, acutely 3-angled, glabrous. Leaves linear, sca- 

 brous along the margin. Spikes lat.-ral and (ermiiud, pi'n.Juloun. 

 6^/«///t'S keeled, ferruginous, glabrous. Seed rough. — Zf. May — SepL 

 Damp soils. 12 — 18 inches. 



