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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 2 



Syngonanthus humboldtii var. orinocensis Moldenke, var. nov. 



Tlaec varietas a forma typica speciei recedit caulibus crassioribus, foliis 

 basalibus 3-8 cm. longis, foliis caulinis usque ad 2.3 cm. longis, pilis glanduli- 

 feris. 



TYPE: under thickets on moist white sand about borders of small "laja," 

 Rio Temi, one hour below Yavlta, Rio Atabapo, Rio Orinoco, October 20, 1950, 

 B. Maguire 29340; New York Botanical Garden. 



Syngonanthus longipes Gleason. 



Annuals to 1 m. tall, occasional in little wet savanna, 150 m. alt., northwest 

 of the base of Cerro Moriche, Rio Ventuari, Maguire, Cowan & Wurdack 30983. 

 The species was hitherto known only from the Mount Roraima region of British 

 Guiana (Appun 1199, ImThurn 33, Schomburgk 1060) and, in Bolivar, Venezuela, 

 from 1100 m. on Mount Auyan-tepul (Tate 1329) and from 1220 m. between Santa 

 Teresita de Kavanayen and the base of Ptari-tepul (Steyermark 60304). 



Syngonanthus oblongus (Korn.) Ruhl. 



With pale green leaves and white heads, at base of waterfalls, Culebra Creek, 

 1300 m. alt., Cerro Duida, Rio Cunucunuma, Maguire, Cowan & Wurdack 29630; 

 occasional in moist places among rocks, Cano Culebra, 1300 m. alt., Cerro Duida, 

 Maguire & Maguire 29158. Whether var. aequinoctialis Ruhl. is really distinct is 

 questionable. The characters given by Ruhland do not seem to be constant, but 

 the typical form of the species seems to have macroscopically plainly villous 

 heads, while the variety has them subglabrous. On this basis the specimens 

 cited above represent the typical species which was known hitherto only from 

 Colombia (Vaupes) and Brazil (Amazonas, Bahia, Goyaz, Mattogrosso, and Piauhy). 



Syngonanthus phelpsae Moldenke. 



Infrequent along Cano Grande, Campo Grande, 4500 feet alt., Maguire & Politi 

 27584; frequent in sphagnum hummocks, wet shrub savanna, Cano Negro, 3500 

 feet alt., Maguire & Politi 21691. 



Syngonanthus phelpsae var. elongatus Moldenke, var. nov. 



Haec varietas a forma typica speciei recedit caulibus 5 cm. elongatis et foliis 

 2.5-4 cm. longis. 



TYPE: on cumbre at west rim, 2000 m. alt., Cerro Paru, Amazonas, Venezuela, 

 January 31, 1951, R. S. Cowan & J. J. Wurdack 31098; New York Botanical Gar- 

 den. The collectors note that all the material of this number was taken from a 

 single ^lump. 



Syngonanthus simplex (Miq.) Ruhl. 



Frequent on white sand, border of small savanna in the vicinity of Base 

 Camp, 160 m. alt., Cerro Sipapo (Paraque), Maguire & Politi 28035. The 

 species is known from Amazonas, Bolivar, and Falcon, in Venezuela, as well as 

 from British Guiana, Surinam, and Brazil (Minas Geraes). 



Syngonanthus tenuis (H.B.K.) Ruhl. 



Infrequent in wet places, Savanna No. Ill, 125 m. alt., Cerro Yapacana, Rio 

 Orinoco, Maguire, Cowan & % Wurdack 30413. The species is known only from 

 Venezuela (Amazonas and Bolivar) and Brazil (Amazonas and Para). 



Syngonanthus yapacanensis Moldenke, sp. nov. 



Herba brevissime caulescens: foliis linearibus 1-2 cm. longis, ca. 0.5 mm. 

 latis, patentibus brunnescentibus obtusis glabris firmis; vaginis pertenuibus arete 

 adpressis 1-1.5 cm. longis glabris; pedunculis paucis gracillimis stramineis 3.5- 

 9.5 cm. longis tricostatis basim versus plusminusve albo-pilosis, apicem versus 

 glabrescentibus; capitulis hemisphaericis albis 3-6 mm. latis. 



