1963] 



BOTANY OF THE GUAYANA HIGHLANDS PART V 



235 



2. Lower surface of leaf-blades with rather conspicuous, loosely spreading hairs 

 mainly (0.75)1-2.25 mm long; upper surface of leaf -blades generally with 

 hairs (0.5)1-3 mm long. 2a. P. dichotoma var. dichotoma. 



2a. Perama dichotoma var. dichotoma Fig. 78, E-I. 



Perama dichotoma Poepp. & Endl. Nov. Gen. & Sp. 3: 29. pi. 235. 1845. 



Distribution. Dry or moist rocky, usually sandy open or shaded ground in 

 savanna, border of forest, or in forest bordering streams, British Guiana, sand- 

 stone tepuis, mesas, and sandy areas of the Gran Sabana of southern Venezuela, 

 and Amazonian Brazil from the Rio Para to the Rio Icana in the upper Rio 

 Negro drainage, at elevations from near sea level ascending to 1980 m in the 

 Gran Sabana of Venezuela. 



BRITISH GUIANA. Dry rocky ground, savannas, Kaieteur Plateau ; 4 May 

 1944, Maguire & Fanshawe 23211 (NY, VEN) ; Imbaimadai, Imbaimadai Savan- 

 nas, Pakaraima Mountains, Upper Mazaruni River ; alt. 1300 m ; 24 Oct 1951, 

 Maguire & Fanshawe 32266 (NY) ; wet forest, East Coast Water Conservancy, 

 southeast of Georgetown; sand reef at head of Hoorubia Creek; 26 Nov 1919, 

 A. S. Hitchcock 16951 (NY). VENEZUELA. Bolivar: Roraima, 1842-3, Schom- 

 burgk 968 (NY) ; moist rocky areas along Rio Caroni near rapids just below 

 Uriman ; locally frequent ; alt. 393 m ; herb ; 11 Jan 1955, Stcyermark & Wurdack 

 69 (F, NY, VEN) ; Rio Arequi, Cerro de las Guacamayas ; alt. 800 m; 9 June 

 1954, Bernardi 1667 (NY, Univ. Andes, Merida) ; Rio Uairen, Alto Caroni; 25 

 Apr 1946, Lasser 1710 (NY, VEN) ; lugares humedos y algo sombreados, Auyan- 

 tepui ; alt. 1800 m ; Apr 1956, Foldats 2631 (VEN) ; Boca Auraima, Rio Paragua ; 

 6 Sep 1943, Cardona 883 (VEN) ; white sand, Salto de Auraima, Rio Paragua; 

 alt. 275 m ; 10 Apr 1943, KUlip 37356 (P, US, VEN) ; muddy sabana, Rio Tonoro, 

 Alto Rio Paragua; 20 Aug 1943, Cardona 835 (NY, US, VEN); cumbre del 

 Cerro Tonoro, Alto Paragua; alt. 700 m; 15 Aug 1943, Cardona 855 (VEN) ; vi- 

 cinity of Salto de Pacairao, about 3 km E to NE of Santa Teresita de Kavanayen ; 

 alt. 1220 m; 24 Nov 1944, Steyermark 60504; vicinity of "Misia Kathy Camp," 

 Ptari-tepui; alt. 1585 m; 28 Oct 1944, Steyermark 59470 (F, NY, VEN) ; Sierra 

 Ichun: above waterfall; 27 Dec 1961, Steyermark 90286 (NY, VEN); Sierra 

 Ichun : mossy open rocks along shore, on north side of Rio Ichun ; 28 Dec 1961, 

 Steyermark 90330 (NY, VEN) ; same locality and date, Steyermark 90342; wet 

 savanna, 2 km south of Rio Chibau, Rio Chicanan, Alto Rio Cuyuni ; alt, 100 m; 

 1 Sep 1962, Bassett Maguire, Julian A. Steyermark, & Celia K. Maguire 53548 

 (NY, VEN) ; Cerro Piton, Cordillera Epicara, Rio Chicanan, Alto Rio Cuyuni; 

 alt. 400 m ; 5 Sep 1962, Bassett Maguire, Julian A. Steyermark, & Celia K. 

 Maguire 53621 (NY, VEN). Amazonas: Savana Hills, summit of Cerro Duida; 

 alt, 1025-1200 m ; 2 Sep 1944, Steyermark 58245 (F, NY); Brocchinia Hills, 

 summit of Cerro Duida; 1 Sep 1944, Steyermark 58166 (F, NY, VEN) ; locally 

 frequent in cumbre, Cerro Yapacana, Rio Orinoco; alt. 1200 m; 3 Jan 1951, 

 Maguire, Cowan, & Wurdack 30654 (NY) ; frequent in savanna near Base Camp, 

 Cerro Sipapo (Paraque) ; alt. 125 m ; 30 Dec 1948, Maguire & Politi 28032 (NY) ; 

 frequent, banks Culebra Creek above Culebra Falls, Cerro Duida; alt. 1500 m; 

 25 Nov 1950, Maguire, Cowan, d; Wurdack 29744 (NY). BRAZIL. Amazonas: 

 Rio Igana, Tunui, pe da Serra ; 23 Oct 1947, J. Murca Pires 707 (NY). Para: 

 in campis arenosis herbidis, insulae Colares flumini Para, June 1832, Poeppig 

 2994 (isotype of P. dichotoma, NY). 



