ORDER CXLI. CYPERACE^E. 563 



panicles, pendulous. Seed compressed, surrounded by scabrous bristles. 

 — If. Through the summer. Wet soils. 1 — 2 feet. 



8. R. seta'cea, (Vahl.) (R. rariflora, Ell.) Stem leafy, setaceous. 

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

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

 palea3. Bristles 3 — i. — If. April — May. In bogs. Common. 10 — 

 12 inches. 



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

 late, glabrous, serrulate. Mowers 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. Seed rough, surrounded by bristles. — 2f. July — August. Damp 

 soils. 1—2 feet. 



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

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

 numerous, arranged in a compound panicle. Glumes ovate, ferruginous. 



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



Genus XII— DULICH'IUM. Pers. 3—1. 



(The name of an island.) 



Spikes somewhat racemose, axillary ; spikelets linear-lanceo- 

 late, compressed. Glumes distichous, sheathing. Style very- 

 long, 2-cleft. Nut with bristles at the base. 



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

 base, triangular above. Leaves linear-lanceolate, pointing in 3 direc- 

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

 Peduncles as long as the sheaths of the leaves. 



Tribe IV.— SCLERIN'EJE. 



Spikes monoecious; fertile spikelets 1-flowered, staminate 

 several -flowered ; achenia nut-like, globular. 



Genus XIIL— SCLE'RIA. 19—3. 

 (From skleros, hard ; the fruit is hard.) 



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

 flowered ; paleae unawned. Fertile florets ; glumes 2 — G, 1- 

 flowered ; palere none. Stigmas 1 — 3. Seed sub-globose. 



1. S. pauoiflo'ra, (Muhl.) (S. oligantha, Mich.) Stem slender, 3-an- 

 gled, glabrous, slightly pubescent at the summit. Leaves linear, slight- 

 ly pubescent at the base, scabrous on the upper surface. Flowers in fas- 

 cicles or spikes, 2 — 3, sessile near the summit, one on a long peduncle. 

 Fertile florets at the summit ; sterile at the base. Seed white, smooth. 



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



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

 brous along the margin. Spikes lateral and terminal, pendulous. 

 Glumes keeled, ferruginous, glabrous. Seed rough. — If. May — Sept. 

 Damp soils. 12—18 inches. 



