« LARKE I III. CYPEB \< l. M. OF COSTA i:l< \. I ."» 1 



Cyperus rotundus L. Sp. PI. ed. 2. 1:<;:. 1.762. 



Distribi tion: Common in all warmer parte of the world; a troublesome weed in 

 cultivated Lands. 



Allied i" C. esculentus L. and much resembling it; differing b; Ions, which 



are stoul and \\ I \ . rather than slender and evanescent. 



3. MARISCUS ( 



laen n 



Spikelete I to several-flowered; rachilla continuous, deciduous from a cushion jusl 

 above the two lowesl empty glumes; fertile glumes long persistent; otherwise like 

 Cyperus. Leaves in the Costa Rican Bpeciee elongated, narrow, green. 



Species 180, distributed to all the warmer parts of the globe. 



K \ \ TO 'I'll l. SPE< N - 



Spikelets few-flowered, narrow; umbel simple. 



Spikelets minute, maturing but L nul I . \f.haenkei. 



Spikelets maturing 2 J;o I nuts, greenish straw-color 2. M. siel 



Spikes of every ray of the umbel digitate; spikelets short, bear- 

 ing few nutlets. 

 Spikes long. 



Spikelets turgid, red-dotted 3. .1/. mutisii. 



Spikelets green, linear-oblong I. M.ehn nbergianus. 



Spikes short. 



Spikelets short . tawny, congested 5. I/, rufus. 



Spikelets oblong, maturing 3 to 7 nuts: rootstock horizontal. 



Umbel crowded almost into a head 6. M. manimae. 



Spikelets Bpicate, mostly loosely so. 



Spikelets linear, maturing 2 to 4 nuts; spikes usually long. 



Spikelets somewhat densely crowded 7. M. jacquinii. 



Spikelets rather remote 8. M ' . dissitiflarus. 



Spikelets usually maturing l to L6 nuts. 



Spikelets linear, green 9. M.flabelliformis. 



Spikelets yellowish-brown, flattened L0. M. strigosus. 



Spikelets dec]) blood-red brown 11. M. saturatus. 



1. Mariscus haenkii .1 . S. & C. B. Presl, Etel. Eaenk 1: 181. 1828. 

 Cyperus pittieri Boeckl. Allgem. Bot. Zeitschr. 2: 19. 1896. 



Umbel simple; spikes rather small, sessile or nearlj so, d< use, dark-brown; spike- 

 lets linear-oblong, maturing bul 1 nut; fertile glume striate, acutish; style 3-fid; 

 nut linear-oblong, two-thirds the length of bh giuine. Fruiting spikelets 3 mm. 

 Long, : > to I mm. wide, nol turgid; rachilla broadly winged above the fertile glume, 

 the wing resembling a second glume, bul the rachilla also bearing a very small 

 depauperate glume. 



Distribi tion : < !alifornia ; Mexico. 



Costa Ri< \\ collection: Salinas Bay, Tonduz 2711. 



2. Mariscus sieberianus Nees, Linnaea 9: 286. 1834. 



Distribution: Very common in the warmer pan- of the < >hl World; in the New 

 WOrld rare. 



Mariscus sieberianus evolutior C. B. Clarke in Ilo..k. i. I'l. Brit. End. 6: G 



L894. Spikelets linear, 2 to l nut-bearing. 



Distribution: Eeated regions of the Old World, rather frequent; in the \'v. 



World less SO. 



( Iosta R u \\ • o] 1 1:< tions: Ta la i nam a . Fondu s 8737 ; El Rodeo de Paquita, altitudi 

 900 meter.-. Tondw 1621. 

 13391—08— 2 



