30 



MEMOIRS OF THE NEW YORK BOTANICAL GAKDKX 



[VOL. 10 



50. Xyris bicostata Maguire & Smith, sp. nov. Fig. 14, A-F. 



Herbae acaules, cespitosae ; foliis ad 15 cm longis; vaginis 4-6 em longis, 

 suleatis, pallide brunneis, apice eligulatis et cum laminis confluentibus, basi 

 abrupte dilatatis et atrioribus, intus dense longeque ciliatis; laminis linearibus, 

 acutis, 0.8 mm latis, suleatis, margine paulo incrassatis et pallido-ciliatis ; scapo 

 15-20 cm alto, subtereti, 0.5 mm diametro, bicostato, costis ciliatis exceptis glabro ; 

 vagina scapi omnino foliacea, longe laminata ; spica anguste fusiforme, dein ex 

 sicco obconica, 9-10 mm longa, biflora ; bracteis lanceolatis, acutis, integris, 

 glabris, valde carinatis, area dorsali magna lineari praeditis, basilaribus valde 

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

 linearibus, acutis, 7 mm longis, anguste carinatis, glabris; placentis basilaribus. 



Type. Flowers yellow, frequent on mossy rocky banks, dense woodland along 

 Right Fork of Carlo de Dios, alt. 1800 m, Summit Camp, Cerro Huachamacari, 

 Rio Cunucunuma, 13 Dec 1950, Amazonas, Venezuela, Bassett Maguire, R. S. 

 Cowan & John J. Wurdack 30169 (holotype NY, isotypes S, YEN, US). 



Distribution. Known only by the type collection. 



51. Xyris filiscapa Malme, Repert. Nov. Sp. 3 : 112. 1906. 



Type. In arenosis humidis, Manaos, Amazonas, Brasil, Vie 6172 (S, US). 

 Distribution. Vaupes, Colombia. 



52. Xyris steyermarkii Maguire & Smith, sp. nov. Fig. 15, A-E. 



Herbae subacaules, cespitosae ; foliis lineari-ensiformibus, 3-6 cm longis : 

 vaginis ca. 15 mm longis, sublaevibus, pallidis, apice eligulatis et cum laminis 

 confluentibus, ad basin versus gradatim ampliatis, intus dense ciliatis, alibi 

 glabris; laminis minutissime falcatis, 0.5 mm latis, glabris, sublaevibus, margine 

 haud incrassatis ; scapo 4-12 cm alto, 0.3 mm diametro, tereti, ecostato, ex sicco 

 plus minusve sulcato, glabro ; vagina scapi eis foliorum simili, breviter laminata ; 

 spica anguste fusiforme, 6-7 mm longa, 1-2 -flora ; bracteis lanceolatis, acutis, 

 tenuibus, integris, area dorsali magna angusta rubra praeditis, basilaribus valde 

 reductis, alteris subduplo majoribus sed quam sepalis distincte brevioribus; 

 sepalis lateralibus liberis, linearibus, acutis, 5.5 mm longis, glabris, angustissime 

 carinatis ; placentis basilaribus. 



Type. Flowers minute, yellow, locally frequent along stream banks, Cano 

 Moja(Jo, between base of upper falls and drop to escarpment, alt. 1895-1910 m, 

 summit, Chimanta Massif, Torono-tepui, 23 Feb 1955, Bolivar, Venezuela, Julian 

 A. Steyermark & John J. Wurdack 1096 (holotype NY, isotype US). Paratypes. 

 South-facing forested slopes above valley of South Cano, on summit, alt, 1955- 

 2090 m, locally frequent, 23 Feb 1955, Steyermark & Wurdack 1122; rare in moist 

 moss, sandy slopes at base of rock face along Rio Tirica, above Middle Falls below 

 Summit Camp, alt. 1925 m, 5 Feb 1955, Steyermark & Wurdack 468. 



Distribution. Known definitely only from the Chimanta Massif. 



A collection, Steyermark 60306, from Ptari-tepui, Gran Sabana, is doubtfully 

 referred to this species. 



53. Xyris connosepala Lan jouw & Lindeman, Bull. Torrey Club 75 : 639. 1948. 



Type. Frequent in wet sphagnum-filled cracks in rocks, Savanna IV, Tafel- 

 berg, Suriname, Maguire 24395a (holotype U, isotype NY). 



Distribution. Known certainly only from Tafelberg, a discontinuous element 

 of Guayana. 



