566 CYPERACE^I. 



achenium pale. — Hab. Jamaica!, Al. ; Antigua!, Wullschl., Dominica!, Imr., S.Vincent!, 

 Guild.; Trinidad!, Sch. ; [Cuba to Guiana!]. 



24. C. densiflorus, Meij. ! Rhizoma short ; stem stout, 3-quetrous, glabrous ; leaves 

 linear, flat; spikes in a compound umbel: involucre 6-12-leaved; spikelets liuear, 18-8- 

 flowered, pale ; glumes oblong-lanceolate, bluntish, striate, twice as long as the furrow, 

 half as long again as the lanceolate-oblong, convex-3-gonal, shortly exserted achenium: 

 furrows convex on the back : wings chartaceous ; stamens 3. — C. ferax, Rich. sec. Ns. (non 

 C. ferox, V.). Diclidium ferox, Schrad. — Habit exactly of the preceding, and variable, but 

 glumes 1'" long, the lowest two empty ones often setaceous, and achenium exserted from the 

 wiugs, at length brown, dotted. — Hab. Jamaica!, Wils. ; Montserrat ; Trinidad!, Cr.; 

 [Guatemala !, Guiana !, Brazil !] . 



25. C. flexuosus, V. Rhizoma short ; stem 3-quetrous above, glabrous ; leaves linear, 

 flat; spikes usually 3-o-nale in a large, unequal umbel: involucre 6-12-leaved; spikelets 

 linear, 6-3-flowered, diverging, pale ; glumes oblong-lanceolate, bluntish, thrice as long as 

 the furrow, twice as long as the lanceolate-oblong, convex-3-gonal, shortly exserted ache- 

 nium -. furrows convex on the back : wings chartaceous ; stamens 3. — Rudg. Guian. t. 20. 

 — C. stellatus, Rudg.— Habit of the preceding, but spikelets shorter (3"'-4'" long), less ap- 

 proximate. 2'-4' high ; glumes li'" long ; achenium pale. — Hab. Jamaica !, March, Wils.; 

 [Cuba ! to Brazil !, Paepp. 3083]. 



26. C. Vahlii, Steud. Rhizoma short ; stem 3-angular, glabrous : one side channelled ; 

 leaves linear, flat; spikes usually 3-h-nate in a simple umbel: involucre 5-8-leaved ; 

 spikelets densely approximate, linear, 12— 4-flowered, purple-brown ; glumes oblong, blunt, 

 striate on the green bark, twice as long as the furrow and as the obovate-oblong, oblique, 

 3-gonal, included achenium : furrows convex on the back : wings chartaceous. — Diclidium, 

 Ns. C. ferox, V. (non C. ferax, Rich.). — 1'-2' high, approaching C. brunneus, Sw., in 

 habit ; glumes H'" long ; achenium pale, dotted.— Hab. Jamaica !, Wils. ; Antigua !, 

 Wullschl.; [Cuba!, French islands !]. 



27. O. Ehrenbergii, Kth. Rhizoma short; stem 3-angular, glabrous: one side 

 channelled ; leaves linear, flat ; spikes usually ternate in a simple umbel i involucre long, 

 3-8-leaved ; spikelets approximate, diverging, linear, 10-6-flowered, pale, or rusty-brown ; 

 glumes oblong-lanceolate, bluntish, 5 -nerved at the greenish back, thrice as long as the 

 furrow, half as long again as the obovate-oblong, convex-3-gonal, more than half exserted 

 achenium : furrows couvex on the back : wings membranaceous ; stamens 3. — C. strigosus, 

 Schlecht. (non L.). — Rhachis less distinctly jointed than in the other Diclidia, but habit and 

 glumes of C. odoratus. — 1'-2' high ; glumes 1'" long ; achenium dotted. — Hab. Jamaica !, 

 Wullschl. ; [Cuba ! to Guiana!, Kegel, 95]. 



Sect. 5. Papyrus, Pet. Thouars. — Spikelets subcompressed with keeled glumes: rhachis 

 persistent, its wings chartaceous, early separated and forming nearly free scales, adhering 

 only at the base. Style 3-cleft. Achenium 3-angular. Spikelets spikate. 



28. C. elatus, L. {non Rottb.). Perennial ; stem high, 3-angular, glabrous ; clusters 

 of spikes in a large umbel, supported by long involucels : involucre very long, many-leaved ; 

 spikelets spikate, spreading, lanceolate-linear, 10-3-flowered, pale ; glumes oblong, mucro- 

 nulate-obtusate, few-nerved at the keel, thrice as long as the furrow and as the lanceolate- 

 acuminate scales ; stamens 3. — SI. t. 8. — Papyrus, Ns. C. Neesii, Kth. C. jubseflorus, 

 Rudg. (Guian. t. 21) ? : a form with shorter involucels. — 6'-9' high ; umbel compound, or 

 simple : involucral leaves linear-acuminate, suberect, often l'-l^'long; rays of the umbel 

 3"-6", spikes 1"-H" long, the latter exceeded by or exceeding the involueel ; glumes % 

 long ; anthers mucronate. — Hab. Jamaica !, Sw., Wils., March, along lagoons ; Barbadoes ; 

 Trinidad !, Cr. ; [Guiana ; East Indies !]. • 



Sect. 6. Mariscus. V. — Spikelets few-flowered, subcompressed with keeled glumes : rhachis 

 jointed at the base: 2 lowest empty glumes persistent below the joint. Style 3 -cleft. 

 Achenium 3-angular. — Spikelets spikate or capitate. 



* Spikes umbellate : spikelets turned to all sides. 



29. O. ligularis, L. Rhizoma short ; stem stout, 3-angular, roughish ; leaves broadly 



