1963] 



BOTANY OF THE GUAYANA HIGHLANDS PART V 



29 



45. Xyris lanulobractea Steyermark, Fieldiana Bot. 28 (1) : 109. /. 16, D-H. 

 1951. 



Type. Swampy ground, alt. 1200 m, Kavanayen, Gran Sabana, Bolivar, 

 Venezuela, Steyermark 59336 (isotype NY). 



Distribution. Infrequently collected herb of wet sandy areas, apparently con- 

 fined to the Gran Sabana. Other than the type collection we have only Maguire 

 33234, from savanna between Uarupata and Enemasic at alt. 1000 m. 



46. Xyris yapobodensis Idrobo & Smith, Caldasia 6 : 231. /. 22. 1954. 



Type. Elevated sandstone savanna Yapoboda, alto [Rio] Cuduyari, ca. alt. 

 400 m, 10 Dec 1934, Vaupes, Colombia, P. //. Allen 3287 (holotype MO). 

 Distribution. Apparently known only by the type collection. 



47. Xyris cyperoides Gleason, Bull. Torrey Club 56 : 17. 1929. 



Type. Kaieteur Savanna, British Guiana, Sep-Oct 1881, Jenman 1056 (K). 

 Distribution. Apparently known only by the type collection. 



48. Xyris rugulosa Maguire & Smith, sp. nov. Fig. 13, A-E. 



Herbae acaules vel breviter caulescentes, cespitosae ; f oliis lineari-ensiformi- 

 bus, ad 4 cm longis ; vaginis ca. 1 cm longis, sulcatis, rubescentibus, glabris, apice 

 ligulatis et quam laminis abrupte latioribus, basin versus gradatim ampliatis; 

 laminis rectis, acuminatis, 0.6-1.0 mm latis, transverse rugulosis, margine valde 

 incrassatis; scapo 4-6 (-13) cm alto, 0.5 mm diametro, subtereti, bicostato, 

 ruguloso ; vagina scapi eis foliorum simili, sine lamina ; spica anguste fusiforme, 

 4—5 mm longa, uniflora ; bracteis anguste lanceolatis, subacutis, integris, tenuibus, 

 glabris, area dorsali magna angusta viridi laeve praeditis, 4 basilaribus sterilibus 

 2.5 mm longis, unica fertili subduplo majore, sepala subaequanti ; sepalis lat- 

 eralibus liberis, subaequilateralibus, anguste oblongis, subacutis, 4 mm longis, 

 anguste carinatis, apicem versus brevissime ciliatis, alibi glabris; placentis 

 basilaribus. 



Type. Frequent along banks of small shaded stream, Cano Negro, alt. 1300 m, 

 Cerro Sipapo, 15 Dec 1948, Amazonas, Venezuela, Bassett Maguire & Louis Politi 

 27699 (hoiotype NY, isotype US). Paratypes. Petals erose, yellow, frequent on 

 banks along Lower Cano Negro, alt. 1400 m, 25 Dec 1948, Maguire & Politi 27916; 

 frequent on white sand, savanna vicinity of Base Camp, 30 Dec 1948, Maguire & 

 Politi 28034. 



Distribution. Known only from Cerro Sipapo. 



49. Xyris guianensis Steudel, Syn. PL Glum. 2 : 285. 1855. 



X. gardneri Malme, Bihang Sv. Vet.-akad. Handl. 26, Afd. 3 (19): 8. pi. 1, f. 1. 1901. 

 Ceara, Brazil, Gardner 1058. 



Type. "British Guiana," Rich. Schomburgk 1058 (K). 



Distribution. Southern Venezuela south to Goias, Brazil. BRAZIL. Rio 

 Branco: Shuurutirin Savanna, Guppy 549 A [F. D. 7564A] (NY). VENE- 

 ZUELA. Bolivar: Sabana de Triana, 50 km suroeste de El Dorado, Steyermark 

 89680 (NY).; 30 km below La Urbana, Rio Orinoco, Maguire & Maguire 29084; 

 Uriman, Steyermark & Wurdack 44. 



