44(3 



BUTTONS PROM THE NATIONAL HERBARIUM 



I •• . k. lllgem. r... i . Zeitachr 1 : L8 

 Distribi pion: Rather common in Europe, western Asia, and Urica; rare in 

 America 



Elii \n m noNs: Hoffmann 190; San Jos£, altitude 1,100 meters, 7Vmduj 



~ a Francisco de Guadalupe, altitude 1,100 meters, '/'<</ 



2 Pycreus propinquus M - 2 ! : 7. !- 



M ; .ui.l Schrad . Nees 1 « i it ae synonym 



( 'ij/< Kunth. Enum 2: L0. L837. 1842. 



Distribi ii"\ Quite frequent in the warmer parts of Africa and Ameri< 



Costa Eta \\ collbction Cafias< Ititude 1,100 meters, PxUier iHL'7. 



:. Pvcreus helvus '* < B. Clarke in Urb. Symb \mill. 2: L6. 19. 19 



Cyperus humboldtianus Schull in Roem & Schult. Syst Mam 2: hm». L824. 

 Ivus Liebm. Dansk Vid. Selsk. ski-. 2: 9 1849 



Distribi pion: Frequent in Mexico and Guatemala; ran' in southern Brazil and 

 alxmt Montevideo. 



Costa Ri< w collection: Turrialba, altitude 500 meters, Tondiu - 



i. e. Cyperus piceus Liebm., 1 is a species oi the section Zonatae, not 

 very different from P. flavescens Eteichenb. 

 i Pycreus lagunetto Steud.) C. B.Clarke. 



Cy perus lagunetto Steud. Syn. PI. Cyp. 2: •">. Lfi 



Cy\ tin u C. B. Clarke, Journ. Linn. Soc. 21: 64. L8£ 



Annual, cespitosi . umbel usually simple; spikelets 2 to 6 in each loose spike; glumes 

 chesl nut-brown, pale on the back; Btyle bifid; nut compressed laterally, puncticulate 

 or Bubreticulate, not transversly lineolate. 



Stems I i" 3 dm. long, rather Blender. Leaves Bhorter than the stem, 2 to 3 nun. 

 wi<l<-. Spikelets commonly L2 nun. long, 8 to 12-flowered, occasionally as much 

 nun. long and 32-flowered. < rlumee somewhat turgid, slightly inflated not rigid, much 

 flattened and indurated as in /'. melanostachyus and P. elegantula). Species differing 

 from /'. " ularis by its loose inflorescence; perhaps rather to 1><- regarded as a southern 

 form "i" that. 



Distribi tion : Rather frequent in Argentina, bul in tropical South America 



I osta Rican collei noNs : San .I"-''-, altitude 1,100 meters, Tonduz 2,831; Rio 

 Caliente, altitude L.300 meters, Pittier 2, n»i. 

 5. Pycreus melanostachyus 1 1 . B. K C. B. Clarke. 



Cyperus melanostachyus II. B. K. Nov. Gen. & Sp. 1: 2Q7. 



Cyperu* diandrus capitatus Britton, Bull. Torr. Club 13: 205. 



Cyperus intricato-ramosus Boeck. Allgem. Bot. Zeitschr. 1: 186. l v 



Stem oblique at base; umbel almost crowded into a single head, or rarely (forma 

 " umbellifera" Boeckl. ms. looser, with rays I to 1 cm. long; Bpikelets 3 nun. w i < 1 « • . 

 linear-oblong, much flattened, rather hard, dark chestnut brown, almost black, shin 

 ing, glumes sharply carinate, rigidly imbricate (but compare var. (i below); style 

 bifid; nut ellipsoidal, laterally compressed, obscurely puncticulate, not transversely 

 lineolate. 



Distribi tion: Frequent from California to Argentina, very common in Mexico. 



Costa Ricajn collections: Hoffmann 207; Tie- Rios, Pittia 1336; Carrillo, alti- 

 tude 300 meters, Cooper 514; Alajuelita, altitude 1,000 meters, Tonduz 678 bis; U 

 Palma, altitude 1,500 meters, Pxttier 678a, Tonduz 12627; San Jose, altitude 1. 100 

 meters, Tonduz 3196; Alajuelita, altitude 1,000 meters, Tonduz 8847. 

 5a. Pycreus melanostachyus variegata | 1 1 . B. K C. B. Clarke. 



Cyperus variegatus II. B. K. Nov. Gen. & Sp. 1: l>os. isir>. 



" The specific name olfersianus is older and unoccupied. Editor. 

 & The specific name humboldtianus is older and unoccupied. Editor. 

 ■ Dansk. Vid. Selsk. Skr. 2: 12. L849. 



