566 CYPERACB^. 



achenium pale. — Hab. Jamaica!, Al. ; Antigua!, Wullsehl., Dominica!, /mf., S.Vincent!, 

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

 / 24. C. densiflorus, Mei/..' Bhizoma short ; stem stout, 3-quetrous, glabrous; leaves 

 linear, flat; spikes in u compound umbel: inVolucre 6-12-leaved; apikelets linear, 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 exserled achenium: 

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

 C. ferox, Fl). 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 

 wings, at length brown, dotted. — Hab. Jamaica!, Wils. ; Montserrat; Trinidad!, &.; 

 [Guatemala !, Guiana !, Brazil !]. 



25. C. iiexuosus, V. Ehizoma short ; stem 3-quetrous above, glabrous ; leaves linear, 

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

 linear, ^—Z-jlowered, diverging, pal'C ; 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, Sudg. — Habit of the preceding, but spikelets shorter (3"'-4"' long), less ap- 

 proximate. 2'-4' high ; glumes li'" long ; achenium pale. — Hae. Jamaica I, March, WUs.; 

 [Cuba ! to Brazil !, P(epp. 3083]. 



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

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

 spikelets densely approximate, linear, 12-4i-&ovieieA, purple-broum ; glumes oblong, blunt, 

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

 Z-gonal, included achenium : furrows convex on the back : toings chartaceous. — Diclidium, 

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

 habit ; glumes 1^'" long ; ,achenium pale, dotted. — Hab. Jamaica !, Wils. ; Antigua !, 

 Wullsehl. ; [Cuba I, French islands !]. 



27. C. Ehrenbergii, Kth. Ehizoma short; stem S-angular, glabrous: one side 

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

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

 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 convex on the back : mngs membranaceous ; stamens 3. — C. strigosus, 

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

 glumes o{ C. odoratus. — l'-2'high; glumes 1'" long; achenium dotted. — ^Hab. Jamaica!, 

 Wullsehl. ; [Cuba I to Guiana !, Kegel, 95]. 



Sect. 5. Papybus, Pet. Thouars. — pikelets subcompressed mth keeled glumes: rhachis 

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

 only at the base. Style Z-cleft. Achenium S-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-S-fowered, 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, Eth. C. jubseflorus, 

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

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

 3"-6", spikes 1 "-IJ" long, the latter exceeded by or exceeding the involucel ; glumes i'" 

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

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



Sect. 6. Mamscus. F. — pikelets few-flowered, subcompressed viith keeled glumes : rhachis 

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

 Achenium S-angular. — Spikelets spikate or capitate. 



* Spikes umbellate : spikelets turned to all sides. 



29. C ligularis, L. Rhizoma short ; stem stout, 3-augiUar, roughish ; leaves broadly 



