s 



32 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [VOL. 10 



54. Xyris subuniflora Malme, Rec. Trav. Bot. Neerl. 9 : 129. 1912. 



X. capillaris Steyermark, non Malme. Type. Swampy rills in Esmeralda Savanna, Ania- 

 zonas, Venezuela, Steyermark 57835 (isotype NY). 



Type. In arenosis humidis, Suriname, Splitberger 990 (L). 



Distribution. Delicate, often cespitose plants of moist sandy areas at low alti- 

 tude. SURINAME. Splitberger 990 (holotype). BRITISH GUIANA. Kaieteur 

 Savanna (ace. Sandw.), Sandwith 1373 (K). VENEZUELA. Rio Yatua margins 

 just above Piedra Arauicaua, Amazonas, Maguire, Wurdack & Maguire 41629. 

 COLOMBIA. Cano del Caribe, Rio Guainia, 2° 45'N-67° 50'W, Vaupes, Schultes, 

 Baker & Cabrera 1827 6- A (COL, US). 



55. Xyris rubrolimbata Heimerl, Ann. Naturh. Hofmus. Wien 21: 70. pi. 4, 



f. 4-6. 1906. 



Type. Moist sandy woods, Lomo, 100 km northwest of mouth of Casiquiare, 

 Vaupes, Colombia, Spruce 2994 (W, destroyed ; F photo no. 30008 ; K). 



Distribution. Vaupes, Colombia and adjacent Venezuela, at low elevations. 



56. Xyris applanata Idrobo & Smith, Caldasia 6 : 238. /. 27. 1954. 



Type. Cerro Isibukuri, Rio Kananari, Vaupes, Colombia, Schultes & Cabrera 

 14466 (holotype COL, isotype NY, US). 



Distribution. Known otherwise only by Schultes & Cabrera 13401, collected 

 at the type locality. 



57. Xyris duidensis Malme, Bull. Torrey Club 58 : 325. 1931. 



Type. Gorge of Cano Negro, Savanna Hills, alt. 4000 ft, Cerro Duida, 

 Amazonas, Venezuela, G. H. H. Tate 811 (holotype NY). 



Distribution. Sandstone mountain summits, alt, 1100-2000 m, confined to 

 Venezuelan Guayana. VENEZUELA. Bolivar: Auyan-tepui, Tate 1319 (NY); 

 Vareschi & Foldats 4721 (NY), 4762 (NY). Amazonas: Cerro Duida, Tate 544 

 (NY), Steyermark 58145 (NY) ; Cerro Sipapo, Maguire & Politi 27916, 28469; 

 Cerro Guanay, Maguire, Phelps, Hitchcock & Budowski 31704. 



58. Xyris surinamensis K. Sprengel, Tent. Suppl. Syst. Veg. Linn. 2. 1828. 



X. eriophylla Eeichb. in PI. Exs. Weigelt 1827 (?). 

 Type. Suriname, Weigelt. 



Distribution. Plants of sandy savannas, more often at low altitudes but reach- 

 ing elevations of 800 m. Common and widespread in coastal Guiana and in 

 Guayana. Variable in density of pubescence ; the strongly pubescent or lanate 

 forms have been called X. eriophylla Reichb., merely because of the significance 

 of the specific epithet. 



59. Xyris frequens Maguire & Smith, sp. nov. Fig. 16, A-E. 



Herbae acaules, cespitosae ; foliis lineari-ensiformibus, 19-29 cm longis, plus 

 minusve rugulosis ; vaginis 3-7 cm longis, pallidis, apice eligulatis et cum laminis 

 confluentibus, ad basin versus gradatim ampliatis, intus ciliatis, alibi glabris; 

 laminis 0.7-1.2 mm latis, paulo compressis, apice piloso excepto glabris; scapo 



