MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[vol. 10 



62. Xyris teinosperma Idrobo & Smith, Caldasia 6 : 224. /. 18. 1954. 



Type. Yapoboda, Vaupes, Colombia, 10 Dec 1943. P. H. Allen 3195 (holotvpe 

 COL, isotypeMO). 



Distribution. Plants of inundable savannas at low altitudes; drainage of the 

 Alto Orinoco and Upper Rio Negro. COLOMBIA. Vaupes: Cerro Yapoboda, 

 Schultes & Cabrera 14384 (COL), 19972 (COL); Puerto Colombia, Schultes 

 18188 (COL) ; Cerro de Canenda, Garcia-Barriga 15063 A (COL) ; Rio Parana 

 Pichuna, 8ekuli.es & Cabrera 19942; Puerto I Colombia, Maguirt . Wurdaek & Keith 

 41838 (NY, US, VEN). VENEZUELA. Amazonas : Yapacana Savannas, Rio 

 Orinoco, Maguire & Wurdaek 34564, Maguire, Wurdaek & Bunting 36559 A, 

 Maguire, Wurdaek d' Keith 41548; Sabana El Venado, Cano Pimichin, Rio 

 Guainia, Maguire, Wurdaek & Bunting 36319, Wurdaek & Adderley 43293; 

 Sabana, Maroa, Rio Guainia, Maguire, Wurdaek d- Keith 41758. 



63. Xyris pratensis Maguire & Smith, sp. now Fig. 19, A-E. 



Herbae acaules, cespitosae ; foliis lineari-ensiformibus, 30-37 cm longis; 

 vaginis 5-11 cm longis, sulcatis, rubescentibus, apice eligulatis et cum laminis 

 confluentibus, ad basin versus gradatim latioribus dein triangulari-auriculatis et 

 atro-castaneis ; laminis acutis, minute falcatis, 2 mm latis, sulcatis, margine paulo 

 incrassatis, ciliatis, alibi glabris; scapo ultra 50 cm alto, paulo complanato, 1.5 

 mm lato, costato, ciliato ; vagina scapi f oliacea, longe laminata ; spica ellipsoidea, 

 dein ex sicco obovoidea, 8-10 mm longa, submultiflora ; bracteis decussatis, late 

 ovatis, subacutis, atris, area dorsali angusta valde carinata praeditis, basilaribus 

 valde reductis, alteris sepala subaequantibus ; sepalis lateralibus liberis, aequi- 

 lateralibus, lanceolatis, acutis, 8 mm longis, late carinatis. glabris; placentis 

 basilaribus. 



Type. Pubescent, frequent in wet hummocks, Camp Savanna, Campo Grande, 

 alt. 1500 ni, Cerro Sipapo (Paraque), 10 Dec 1948, Amazonas, Venezuela, Bassett 

 Maguire & Louis Politi 27581 (holotype NY, isotype US) . 



Distribution. Known only by the type collection. 



64. Xyris araracuarae Maguire & Smith, sp. nov. Fig. 20, A-F. 



Hesbae acaules, subbulbosae: foliis 15-20 cm longis; vaginis 5 cm longis, 

 sulcatis, rubescentibus, basi abrupte orbieulari-dilatatis et atro-castaneis, intus 

 longe denseque ciliatis, alibi glabris ; laminis tortuosis, acuminatis, 0.7 mm latis, 

 ex sicco irregulariter sulcatis, margine haud incrassatis, glabris ; scapo 30 cm 

 alto, 0.7 mm diametro, tereti, sublaeve ; vagina scapi eis f oliorum simili, brevis- 

 sime laminata; spica late ellipsoidea, dein ex sicco obovoidea, 8 mm longa, 

 submultiflora; bracteis ellipticis, late rotundatis, pallidis, margine tenuibus 

 laceratisque, area dorsali magna angusta laeve viridi praeditis, basilaribus valde 

 reductis, alteris sepala superantibus ; sepalis lateralibus liberis, aequilateralibus, 

 lanceolatis, acutis, 6 mm longis, anguste carinatis, ad apicem versus brevissime 

 ciliatis ; placentis perjuvenilibus ignotis. 



Type. Frequent in scrub savanna, Araracuara, Rio Caqueta, 5 Sep 1959, 

 Amazonas, Colombia, Bassett Maguire, C. K. Maguire & A. Fernandez 44132 

 (holotype NY, isotype US). 



Distribution. Known only by the type collection. 



