r ,-* ' I 





CLARKE THE CYPERACEAE OF COSTA RICA. 451 



L 



Cypkuus rotundus L. Sp. PI. ed. 2. 1: 07, 17G2. 



DisTKiBUTiox: Common in all Avurnier parts of tlu^ world; a trniiMosomo woed in 

 cultivut(^d lands. 



Allied to C, esculent)ts L. and much rrj^(MnhliTi^^ il ; differing l)y its stolons, which 

 are etout and ^voody, rathor than t^lcndtM' and cvancsront. 



3. MARISCUS (nu^rtn. 



Spikelets 1 to several-nowcrcd; rachilla continvKJiis, dociduouH from a cushion just 

 above the two lowest empty glumes; fertile glumes long jx'rsistent; otherwise like 

 Cyperus. — Leaves in the Costa Rican speci<*K elongaltHl, narrow, green. 



Speci(^s 180, distributc^d to all the warmer parts of the globe. 



KEY TO THK SPKCIES. 



Spikelets few- flowered, narrow; umbel simple. 



Spikeleta minute, maturing l)ut 1 luit : 1. M. haaxhi, 



Spikelets maturing 2 to 4 nuts, grecmish straw-color 2. M. sichcrianiis,' 



Spikes of every ray of the umbel digitate; spikeh^ts short ^ 1)ear- 



ing few nutlets. 



Spikes long. 



Spikelets turgi<l, red-dotted 3. M, inulinii. 



Spikelets green, linear-oblong 4. M,ehrenher(jianm 



Spikes short. 



Spikelets short, tawny, ttongested 5. M, rufus. 



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



Umbel crowded almost into a In^ad 6. M. manimae. 



Spikelets spicate, mostly loos<^ly so. 



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



Spikelets somewhat densely crowded 7. i/. jacqalniL 



Spikelets rather remote 8. M. dissilijlofus. 



Spikelets usually maturing 4 to KJ nuts. 



Spikelets liiiear, green . , . - 



9. M. JlahcUlfonnis. 



Spikelets yellowish-brown, flat tened 10. 3/. atrigosus. 



Spikelets deep blood-r(^d brown 11. M. saturatiis. 



L Mariscushaenkii J. S. & C. B. Presb Rel. llaenk 1: 181. 1828. 



Cypei-tci> pittieri Boeckl. AUgem, Bot. Zeitschr. 9: 19. 1S90. 



Umbel simple; spikes rather small, sessile or nearly so, dense, dark-brown; spike- 

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

 nut linear-oblong, two-thirds the length of the ghuue. — Fruiting sj)ikelets 3 mm. 

 long, 5 to 1 mm. wide, not turgid; rijchilla l)roadly w^inged above th<i ftTtih* gbune, 

 the wing resembling a second gbune, but tlu^ rachilla also hearing a very small 

 depauperate glume. 



DiSTRiBUTiox: California; Mexico. 



Costa Rican collection': Salinas Bay, Toffdaz 2111. 



2. Mariscus sieberianus \ees, Lunuu^a 9: '2W, 1834. 



F 



Distribution: Very common in the warmer parts of the Old World; in the New 

 World rare. 



2a. Mariscus sieberianus evolutior C. B. Clarke in Hook. f. Fl. Brit. Ind. 6: 622. 

 1894. Spikelets linear, 2 to 4 nut-bearing. 

 Distribution: Heato<l regions of th(? Old World, rather frequent; in the New 



World less so. 



Costa Rican collections: Talamanca^ TonduzS7'd7; El Rodeo de Faquita, altitude 

 900 meters, Tonduz 1621. 



13391—08 2 



