1963] 



BOTANY OF THE GUAYAXA HIGHLANDS PART V 



17 



costate peduncles, is from the Kaieteur Savanna. British Guiana. X. connectens 

 Malme. Ark. Bot. 19(13) : 2 (1925), Dueke 15060, would belong here. 



8. Xyris seubertii Alb. Nilsson, Sv. Vet.-akad. Handl. 24(14) : 51 pi. 4. 1892. 



X. calcarata Heimerl, Ann. Xaturh. Hofm. Wien 21: 68. pi. 4. f. 1-3. 1906. 



Type. "British Guiana, Rich. Schomburcjk n. 897" (isotype US). 



Distribution. Venezuelan Guayana, Gran Sabana, Korainia region, infre- 

 quently collected: Rio Kukenan, vie. Bfft. Roraima, Steyermark 59190 (NY, US) ; 

 im Thurn 257 (US). South to Mato Grosso, Goias, and Minas Gerais in Brazil. 



9. Xyris thysanolepis Maguire & Smith, sp. nov. Fig. 3, A-F. 



Herbae breviter caulescens, ramosae ; ramis erectis vel adscendentibus ; f oliis 

 obscure distichis, ad 40 cm longis. vix rigidis, ex sicco leviter sulcatis, glabris, 

 margine hand incrassatis ; vaginis ad 14 cm longis, basi gradatim dilatatis, apice 

 eligulatis et cum laminis confluentibus : laminis valde applanatis, acuminatis, 

 4 mm latis ; scapo ca. 70 cm alto, subtereti, ecostato vel 1-2-costato, costis scabri- 

 dis exceptis glabro laeveque : vagina scapi subfoliacea, lamina brevi sed distincta 

 praedita ; spica subglobosa, 9 mm longa, multiflora ; bracteis late ovatis, suba- 

 cutis, sepala superantibus, laevibus, marginibus patentibus latis membranaceis 

 rubris laceratis praeditis, area dorsali carentibus, duabus basilaribus valde cari- 

 natis, alteris apice obscure carinatis ; sepalis lateralibus liberis, ellipticis vel 

 spathulatis, subaequilateralibus, 6 mm longis, carina minutissime ciliata ; sta- 

 minodiis penicillatis ; placentis basilaribus ; seminibus fusiformibus, biapiculatis, 

 0.8 mm longis. 



Type. Rare around moist depressions and swales bordering river, scrub for- 

 est near Summit ('amp, alt. 1925 m. central section Chimanta Massif, 2 Feb 

 1955, Bolivar, Venezuela, J. A. Steyermark & J. J. ^Yurdack 356 (holotype NY, 

 isotype US). 



Distribution. Known only by the type collection. 



10. Xyris hymenachne Martins, Flora 24 2 (Beibl. 2) : 55. 1841. 

 Type. Prov. Minarum, Brazil, Martins 872. 



Distribution. Central Brazilian Plateau and Venezuelan Guayana : infrequent 

 in the Gran Sabana. VENEZUELA. Bolivar: Ptari-tepui, Steyermark 59841 

 (NY, US), and Uaipan-tepui, Phelps d' Hitchcock 376 (NY) ; Amazonas: Cerro 

 de la Neblina, Mag u ire, ^Yurdack ct* Mag u ire 42200 A ; south to Sao Paulo, Brazil. 



11. Xyris concinna N. E. Brown, Trans. Linn. Soc. II. 6: 68. 1901. 



Type. Summit, Mt. Roraima [Venezuela], alt. 8600 ft, McConnell & Quelch 

 496 (K). 



Distribution. We have seen one additional specimen, Tate 432 (NY), from 

 the type locality. 



12. Xyris submontana Gleason, Bull. Torrey Club 56: 393. 1929. 



Type. Philipp Swamp, Mount Roraima [Venezuela], alt. 5100-5200 ft, 11 

 Nov 1927, Tate 334 (holotype NY). 



Distribution. Known only by the type collection. 



