24 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



31. Xyris exserta Idrobo & Smith, Caldasia 6: 229, /. 21. 1954. 



Type. Flowers yellow; on land at rapids, Rio Guainia, Cano Caribe (between 

 Isla del Venado and San Jose) and vicinity, alt. 850-900 ft, Vaupes, Colombia, 

 2 Nov 1953, R. E. Schultes, R. E. D. Baker & Isidoro Cabrera 18276 (holotype 

 COL, isotype US). 



Distribution. Known only by the type collection. 



32. Xyris fusiformis Maguire & Smith, sp. nov. Fig. 8, A-E. 



Herbae acaules, cespitosae ; foliis 10-24 cm longis ; vaginis 15-40 mm longis, 

 dense sulcatis, rubro-brunneis, basi abrupte dilatatis et atro-castaneis, intus dense 

 longeque ciliatis, alibi glabris; laminis teretibus, subulato-acuminatis, ca. 1 mm 

 diametro, sulcatis, albido-punctulatis, glabris; scapo 8-21 cm alto, 0.5-0.8 mm 

 diametro, tereti, ecostato, ex sicco sulcato, glabro ; vagina scapi omnino foliacea, 

 longe laminata sed foliis superata ; spica fusiforme, 7-8 mm longa, 1-3-flora ; 

 bracteis basilaribus paulo reductis, alteris anguste ovatis, subacutis, tenuibus, 

 glabris, area dorsali magna carinata sulcata praeditis, sepala aequantibus vel 

 superantibus ; sepalis lateralibus liberis, linearibus, obtusis, 6 mm longis, anguste 

 carinatis, glabris laevibusque ; placentis basilaribus, elongatis. 



Type. Flowers yellow, Sabana El Venado on left bank of Cano Pimichin, 

 above Pimichin, alt. 140 m, 10 Oct 1957, Rio Guainia, Amazonas, Venezuela, 

 Maguire, Wurdack d' Keith 41815 (holotype NY, isotype US). Paratypes. 23 

 Nov 1953, B. Maguire & J. J. Wurdack 36356 ; flowers yellow, frequent in Yapa- 

 cana Savannas, alt. 125 m, northwest base of Cerro Yapacana, 16 Sep 1957, 

 Alto Rio Orinoco, Maguire, Wurdack & Keith 41538. 



Distribution. Known only by the cited specimens. 



33. Xyris oxylepis Idrobo & Smith, Caldasia 6: 204. /. 7. 1954. 



Type. Sabanas sobre piedras areniscas, alt. ca. 450 m, Rio Kuduyari, Cerro 

 Yapoboda, 5 Oct 1951, Vaupes, Colombia, R. E. Schultes & I. Cabrera 14234-13 

 (holotype COL, isotype US). 



Distribution. Known only by the type collection. 



34. Xyris garcia-barrigae Idrobo & Smith, Caldasia 6: 204. /. 8. 1954. 



T^pe. Sabana de la Angostura, alt. ca. 400 m, Rio Caqueta, Araracuara, 21 

 Dec 1951, Amazonas, Colombia, H. Garcia-Barriga & R. E. Schultes 14168 (holo- 

 type COL, isotype US). 



Distribution. Wet savannas at low altitude, Colombian and Venezuelan Ama- 

 zonas. VENEZUELA. Amazonas: Savannas, alt. 4500 ft, in cumbre of Cerro 

 Moriche, Rio Ventuari, Maguire, Cowan & Wurdack 30936 A; Sabana de Moyo, 

 right bank, Rio Orinoco, 10 km above mouth Rio Ventuari, Wurdack & Adderley 

 43711. COLOMBIA. Vaupes: Cerro Yapoboda, Schultes & Cabrera 14234 

 (COL), Schultes, Baker & Cabrera 18495 (COL), Allen 3207 (COL) ; Rio Pa- 

 rana Pichuna, Schultes & Cabrera 19924 (COL, NY), 19947 (COL) ; savannas 

 1 km w Cacagual, Rio Atabapo, Maguire, Wurdack & Bunting 36291. 



35. Xyris wurdackii Maguire & Smith, sp. nov. Fig. 9, A-E. 



Herbae acaules, cespitosae; foliis 10-22 cm longis; vaginis 2-4 cm longis, 

 dense sulcatis, rubro-brunneis, basi abrupte dilatatis et atro-castaneis, intus 



