468 CONTRIBUTIONS PROM THE NATIONAL HERBARIUM. 



16. UNCINIA I' 



Rowers unisexual; prophylla 2 joined together and forming a bicarinate utricle 

 Enclosing the ovary; a Bel ifonn rudiinenl of the axis of a Bpikelet partly inclosed within 

 the utricle, its stout uncin 1 from it. 



16 mostly inhabiting S ith Temperate Zone, in Australia, Nen Zea- 



land, the more southerly eania, temperate South America, but ;d-<> in 



Mexico and .l.iin 



K\ \ rO Mil BPBCIE8. 



^juk.- dense, 3 nun. in diameter 1. / . famed 



Spike rat her loose, 2 mm. in < l\ U. tenuit. 



1. Uncinin jamaicensis Pi rs. Syn. 2: 534. ls«>7. 



Schk. Riedgr. 1: 13. pi. '■./. :'.(>. 1801, no! I 

 Distribi pion: Prom Central Vmerica to Argentina. 



\ Rican collections: El Copey, altitude L ,800 meters, Tondm L1850; Barba 

 2003 Barba, altitude 2,000 meters, T&nrtui 1693, 2084; Reventado, altitude 

 , • rs, Pitt B52; Volean de Poas, altitude 2,600 meters, Tonduz 10762. 



2 Uncinia tenuis Kunili. I'.num. 2: 525. L837. 



icilu Decaisne in Bomhr. & Jacq*. Bot. Voy. Astrolabe 2: pi. 6. f. B. 1853. 

 Distribution : Chili, P - i sta Rica. 



n \ Hit w collection: Volean de Barba, altitude 2,750 meters, Tonduz L904. 

 .Tin- Costa Rican habitat is entirely new. 



7. CAREX L. 



Flowers unisexual; prophylla 2, united into a utricle inclosing the bicarinate 

 ovary; no rudiment of an axis within the utricle. 

 Specie - 1,300, distributed all over the world in the more humid regions. 



KEY T' I Til i. spe< n -. 



Style branches 2. Vign 



Some of the upper spikes pistillate a1 apex, staminate at base; none staminate at 



summit and pistillate at has . Vignegynae) I. C.heptaMtachya. 



Si. in. 'Mi* the upper spikes staminate at apex, pistillate al h 

 none pistillate at summit and staminate at base. (Vig- 



NEANDRAE 2. C. pichinchentii. 



Style branches 3. i Ei < aijkx. 



Some of the upper Bpikes staminate at summit, pistillate at 

 base; none pistillate at summit and staminate al base. In 

 the Costa Rican Bp cies the Bpikes arc cylindrical and 

 panicled. Cark a.ndb \i.. 

 Spikes 3 to 10 rm. long, rather deeply colore.]. 



Pistillate glumes elongated-lanceolate, hardly acute. '.). C.jamescni. 



Pistillate glumes aristate 1. C. pittieri. 



Spikes I to :'» cm. long, gre< uish-ferruginous. 



Plant of middle size; peduncles slender 5. C. cladontackya. 



Plant a meter high oi mere- peduncles rigid 6. C.joria. 



1. Carex heptastachya l'oeekl. I.innaea 39: 111. L875. 

 Can • jonesii L. 11. Bailey, Mem. Torr. Club 1: L6. L889. 

 Carex durandii Boeckl. AUgem. Bot. Zeitschr. 2: L89. 1896. 



Rootstock Short, -lend.v: stems densely mfted. 10 to 60 cm. long, slender, smooth, 

 toward the triangular summit minutely scabrous; Leaves commonly as long as the stems, 



