448 CONTEIBUTIOXS FROM THE NATIONAL HERBARIUM 



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Spikeletsspirat<*]yamnigod. (Chokistaciiyae.) 

 .Annual, 



Ilachillu of spiki^lets soarcoly winged. 



Glumes rather obtuse _ , . ; io_ ^ sphacelaius. 



Glumes acute, mucmnulate 13. a cowpresstts. 



Rachilla of spikeletti winged; large atuuial 15. C. radiatus. 



Perennial. 



Stolons many, slender, disajjpeariug 14. a acide7itus. 



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1. Cyperus teneiximus J. S. & C. 15. Vrm], Rol. ILuMik. 1: KKi. 18J0. 



Cypenis njmbar/ormis lAchm. Dansk. Vid. Selak. Skr. 2: 20. 1849. 



Cypents ivnivrai Eopck, Liniiaea 38: 3G3. 1874. 



Annual, stem monoccphalous; bracts 4 U> 8, vt^ry long, grassy; glumes elliptic, 

 oymbiform, curved, obtuse, 5-costate, pale cinnamon color; style'-'J-lid; imt oblongi 

 of two-thirda the length of tlio glume. 



Dihthibution: Central America, somewhat rare. 



Costa Hican collections: Littoral zone, Salinas Bay, ToHdaz 2713 28(J(;- 

 Nicoya, Tondiiz 13741. 



Cyperus uncinatus Poir. Encyc. 7: 247. 18(K;. 

 Cyperus cnspkkUus II. B. K. Nov. Gen. & Sp. 1 : 204. 1815. 

 Cyperus aureus J. S. & C. B. Tresl, Ilel. Ilaenk. 1: l(i8. 1830. 

 Cyperus havuilatus Kinuli, Enum. 2: 22. 1887. 



Diktkhujtion; In almost all warm countries; in Central America rather rare. 

 CoKTA RiCAN collections: San Jose, Tondaz SCm. 



3. Cyperus hasp an L. Sp. PI. 1: 45. 1753. 



Cyperus aphyllus Vahl, Eclog. Amer. 2: (1. 1798. 

 Cyperus nudus II. B. K. Nov. Gen. & Sp. 1; 203. 1815. 

 Cyperus adcnophonis ScJirad.; Nees in Mart, V\. liras. 21: 28. 1812. 

 Cyperus efoUalus Boeckl. Allg(>m. Bot. TuAi^vh. 1: 22<>. 1805. 



Distribution: Throughout nearly all warmer regions; often a troublesome wee<l in 

 fields. Very common in Central America. 



C08TA ilu:AN collections: PitUcr <fe Tunduz 3804b; La Cruz de Guanaca^te 

 Pittier 2714; Turrialba, altitude 500 meterB, Tonditz Km; Cafia.s Gordas altitude 

 1,100 meters, Tondu: 10952. 



Tonduz no, 8304 is a large specimen, the stem a meter high, 5 nun. in diameter at 

 summit. The spikel(>ts are altogether those of typical Cyperus liaspan. The sum- 

 mit oi the atem is notably punctate with stomata. The steins hi Pittier's no. 2714 are in 

 like manner punctate. Old World specimens are usually much smaller, and wilh 

 the stomata on the stem indistinct; nevertheless, there occur in the Old World large 

 specimens, the long stems dotted with stomata at summit, l)ut they are more rare here 

 than in America. 



4. Cyperus alternifolius L. Maiit. 28. 1707. 



DisTRincTiox: Ahidagaaear and Bourbon, where it is perhaps indigenous; exten- 

 sively cultivated. 



Costa Rican collections: Public parks at San Jose, altitude 1,100 meters 

 Tonduz 10888. 



This plant is perhaps C. Jlabelliforvns Rottb., forma horteiisisl C. jlahdlijormis 

 Rottb. is common in Africa and widely dispersed. 



5. Cyperus canus J. S. & C. B. Presl, Rel. Haenk. 1: 179. 1828. 



Dioecious, leafless; stem 1 m. liigh, robust; brads fi to 12, equal, surpassing the 

 umbel; this ample, 1 to 3 dm. broad, compound and even decompound; spikelets 

 almost countless, digitately clustered 3 to 8 in a place; style 3-fid. 



Distriiuition: P<>culiar to Central America, where it is of frequent occurrence 

 Costa Rican collections: Hoffmann 1 1 ; Uuchseh. A remarkable species. 



