CLARKE— THE CYPERACEAE "l COSTA RI( V. 153 



Distribi pion: Aii American species, frequent from * alifornia to Venezuela. 



Costa I1k w collections: Hoffmann 54; San Jos£, altitude I LOO meters Cooper 

 5990, Tonduz L428, in part; Cartago, altitude 1,300 meters, Tondm L0443. 

 7a. Mariscus jacquinii angustior < . B. Clarke, subsp. tiov. 



Cypeni8 flavomariscus peduncularis Britton, Bull. Ton*. Club 13: 215. C- 



Smaller, bracts and spikes narrower, less deeply colored. 



Distribution: Frequent from California to Venezuela. 



Costa Rican collections: San Francisco de Guadalupe, altitude l. loo mi 

 Tondm 9699, 9043; San Jos6, altitude 1,100 meters Tonduz L532. 



Hardly, by its denser spikes, specifically distincl from M. dissitiflorus. 



8. Mariscus dissitiflorus C B. Clarke in L T rban, Symb. Ant ill. 2: 15. L900. 

 Oyperus dissitiflorus Nees, LinnaeaQ: 285. L834. 



( '>/}» rus randuzii [tonduzii] hum's Boeckl. Allgem. Bot. Zeitsch. 2: 17. L896. 



Distribi tion: Louisiana to Venezuela. 



Costa Rican collections: Biolley 9461; Talamanca, altitude 200 meters, Ton- 

 duz 9505; San Jose, altitude l.ioo meters, Tonduz 1 128, in part. 

 8a. Mariscus dissitiflorus lucidior C. B. Clarke in LTrban; Symb. Ant ill. 2: 15. 



L900. 



Oyperus pseudosphacelatus Boeckl. Cyp. Nov, 2: 7. L890. 



Distriih tion: Texas to Guiana. 



Costa Rican* collections: Along ro*ad at Guadalupe, Tonduz '.'7m;. 



9. Mariscus flab elliformis H. B. K. Nov. Gen. & Sp. 1: 215. 1815. 

 Oyperus caracasanus Kunth, Enum. 2: 86. Lfi 



Oyperus breviradiatus Liebm. Dansk. Vid. Selsk. Skr. 2: 26. 1849. 



Oyperus hartii Boeckl. Cyp. Nov. 1: 9. 1888. 



Distribution: Tropics of both < >1<1 and New Worlds, more especially of the New. 



Costa Rican collections: Polakowsky 43. 541; Salinas Bay, Pittier 2717; 

 Rio Tin's, altitude 600 meters, Tonduz 8183: San Jose, altitude l.ioo meters, Pittier 

 225; Tonduz 133; alopesof La Carpintera, altitude L700 meters [Pittier], 4335; Tur- 

 rialba, altitude 500 meters. Tonduz 8351; Alajuelita, altitude 1.000 meters, Tonduz 

 8842; Nicoya, TonduzlZ77A; Rio Zhorqufn, Tonduz 8530; Talamanca, Tonduz 8737; 

 San Rafael, Pittier 2584; Puerto Yiejo, Biolley 7461; Golfo de Osa, Tonduz L0027. 



Oyperus hartii Boeckl. is a feebler form, the spikelets sometimes bearing few nuts. 



Mariscus flabelliformis differs from M. jacquinii (5 and \f. dissitiflorus by having 

 the rays of its umbel much shorter, while the Bpikelets are often longer. 



ll<re many species have been proposed by various anthers, which are nol distinct. 



10. Mariscus strigosus (L.) C. B. Clarke. 

 Oyperus strigosus L. Sp. PI. 1: 69. L753. 



Rhizome hardly any; leaves and tracts long, narrow, nol Bpongiose; umbel simple 

 or com { >- Mind; spikes short-cylindric, dense, yellow-brown; spikelets linear, flattened, 

 maturing 6 to 8 nuts, divaricately spreading; glumes elliptic, scarcely acute, al 

 Length obliquely spreading; style 3-fid; nut linear-oblong, curved, half the length of 

 the glume. 



Distribi tion: United States, common. Also in Mexico and Costa Rica. 



Costa Rican collections: Talamanca. Tonduz 8746 bis. 



11. Mariscus saturatus (C. B.Clarke) Donnell Smith. 

 Oyperus saturatus C. B. Clarke. Engl. Bot. Jahrb. 37: 517. L906. 



Robust, leaves and bracts Long, rather broad, somewhat triple-nerved; umbel com- 

 pound, rather dense; spikelets in fascicles of 3 to 8 in a place, deep blood-red 

 brown, narrowly oblong, L2 to 20-flowered; glumes in fruit hardly imbricate, their 



"This citation is mad*' instead of Oyperus flavus peduncularis Britton, Proc. Am. 

 Acad. 21-: -142. 1886. used by Mr. Clarke, the latter name being a nonien nudum. 



