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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 9, No. 3 



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Distribution. Wet boggy or sandy habitats, plateaus and mountain summits, 

 on sandstone, throughout the Guayana Highland. Often flowers of some plants 

 fail of fertilization or for some reason become abortive and do not produce seed. 

 The flowers of such plants are smaller than those of fertile plants. 



Specimens deposited at New York: BRITISH GUIANA: Chinowieng, Ayanganna Plateau, 

 Maguire & Maguire 40643. VENEZUELA: Gran Sabana, Mt. Roraima: Tate 349, 373, 432 A: 

 Pinkus 98; Steyermark 58784, 58858; Auyan-tepul, Tate 1116; Ptan-tepui Steyermark 

 59743; San Rafael, Maguire 33614; Chimanta-tepui, Steyermark & Wurdack 148; 462; 

 Guaiquinima, Maguire 32759, 32825; Serra do Sol, Maguire & Maguire 40395; Terr. 

 Amazonas: Cerro Duida, Tate 481, 674; Steyermark 58193; Maguire, Cowan & Wurdack 

 29696; Cerro Sipapo, Maguire & Politi 27570; Cerro Huachamacari, Maguire, Cowan & 

 Wurdack 30155; Cerro de la Neblina, Maguire, Wurdack & Bunting 36931, 37110. 



Specimens deposited at the British Museum and/or Kew. Abbensetts 11 (K); Appun 

 1157 (K); Forest Department of British Guiana 2864 (K); Quelch & McConnell 42 (K), 85 

 (K), 154 (K); 681 (BM, K); lm Tbum 313 (BM, K); Vie 8609 (K), 8610 (K). 



Closely related to the variable, poorly understood and inadequately circum- 

 scribed population comprising Drosera montana St.-Hil., sensu lat., of the Brazil- 

 ian Plateau, which is ordinarily a much smaller plant with a finer glandular pubes- 

 cence, much shorter (3mm) stipules, and seed which are smaller, with more acute 

 bases, and 8-10 sharply defined vertical rows of papillae. 



4. Drosera cayennensis Sagot ex Diels, Pflanzenreich 4 (112): 86. 1906. 

 TYPE: Sagot 1228, French Guiana. 



Distribution. Savannas of the Rio Negro region, Brazil and French Guiana 

 according to Diels; attributed by Brummer-dinger to the upper Orinoco region of 

 Venezuela; Rio Chiguirete, Edo. Bolivar, Venezuela, Wurdack & Guppy 17. 



5. Drosera arenicola Steyermark, Fieldiana Bot. 28: 243. 1952. 



Diminutive; stem very short, leaves rosulate, conferted; stipules 3 mm long; 

 petioles 5-8 mm long, plane, little narrower than the blade, strigose beneath; 

 blades narrowly oblanceolate, 4-5 mm long, sparingly or moderately strigose 

 beneath, scapes 2-3 or sometimes solitary, 1-7 cm long, 1-10-flowered, moder- 

 ately pilose-stipitate-glandular, particularly in the inflorescence; sepals lance- 

 olate, acutish, ca. 2.5 mm long, rather strongly stipitate-glandular; styles 3, 

 bipartite to the base; seed subglobose ca. 0.3-0.4 mm long, foveolate more or 

 less in vertical lines. 



Drosera arenicola var. arenicola. 



Scapes 1-3, 1-2 cm long, 1-3 (4)-flowered; sepals acute, entire. 



TYPE: Santa Teresita de Kavanayen, Gran Sabana, Edo. Bolivar, Venezuela, 



Steyermark 60920 (Holotype, F). 



Additional specimens. Gran Sabana, Edo. Bolivar; Auyan-tepul, Tate 1127; Kavanayen, 

 Lasser 1739, 1811; Chimanta-tepui, Steyermark & Wurdack 460, 1057. 



Distribution. Known only from boggy savannas, Kavanayen, at 1200 m alt., and 

 from the cumbres of Auyan-tepui' and Chimanta-tepui', at 1800-2000 m alt. 



Drosera arenicola var. occidentalis Maguire & Wurdack, var. nov. 



Folia rosulata, conferta, 10-12 mm longa, subtus moderate fusco-strigosa; 

 stipulis fusco-membrano-scariosis ca. 3 mm longis, in segmentis setaceis, ca. 

 2 mm longis divisis; petiolis 0.7-0.9 mm latis, 6-8 mm. longis; laminis anguste 

 oblongo-oblanceolatis, 3-4 mm longis, ca. 1.5 (2.0) mm latis; scapis 1-3, 2-8 cm 

 longis, moderate piloso-stipitato-glandulosis, (3) 4-10-floribus; sepalis sub- 

 obtusis, inconspicue eroso-denticulatis vel integris; stylis ca. 3 mm longis, a 

 basim biparcitis; apicibus integris, dilato-flabellatis; seminibus subglobosis, 

 nigris, plus minusve apiculatis, foveolatis in lineis verticalibus. 



