‘*Small tree, swollen at base, but rapidly tapering upwards, slender 
and graceful at top. Bark smooth, red brown outside. Capsule coria- 
ceous.’’ October 7, 1947, Richard Evans Schultes & Joao Murca Pires 
8884 (Topotypus).—Same locality and date. Schultes & Pires 8887 
(Topotypus); 8888 (Topotypus).—Estado do Amazonas, Rio Negro 
basin, Rio Padauari, Tapira. November 2, 1947, Ricardo de Lemos 
Frées 22706.—Rio Padauari, Tipica, November 19, 1947, Ricardo de 
Lemos Froes 22888.—Rio Negro, Sao Felipe (below mouth of Rio 
Icana). ‘‘Tree 60 feet tall, columnar, diameter 1 foot. Bark smooth 
but pustulate, red-brown, thin, peeling easily, hard, inside white. 
Bark of terminal branches red. Latex white, very watery, not coagu- 
lating, extremely sparse. Leaflets horizontal, dark green, shiny above, 
paler, slightly glossy beneath. Wood soft. **Seringueira tambaqut.”’ 
January 8, 1948, Richard Evans Schultes & Francisco Lipez 9591,— 
Same locality and date. Schultes & Lopez 9593; 9607; 9608; 9609; 
9610; 9612; 9612A.—Rio Curicuriari, near mouth of river. January 
22, 1948, Schultes & Lopez 9644.—Rio Uaupés, Taracud, Igarapé da 
Chuva. ‘‘Very small tree, 20 feet tall; basally swollen, with slender, 
graceful whip-like trunk above swelling. Leaflets horizontal-reclinate. 
Latex thin, watery, white.’’ February 3-6, 1948, Schultes & Lopez 
9690.—Same locality and date. Schultes & Lépez 9691; 9692.—Rio 
Negro, Piloto (between Barcellos and Sao Joaquim). “*Small tree. 
Latex yellowish, very thin. Leaflets reclinate.’’ March 23, 1948, 
Schultes & Lopez 9735.—Rio Negro, Sao Felipe (below mouth of Rio 
Xié). ‘‘Whip-shaped tree, 65 feet tall; basally swollen; diameter 16— 
17 inches, rapidly tapering to a slender trunk. Bark 4+ em. thick, 
hard, outside reddish brown, smooth (with lenticels), inside reddish. 
Latex very sparse, thin, white. Bark of terminal branchlets smooth 
red. Leaflets glossy, dark green above; dull, lighter green beneath, 
horizontal. Seringueira tambaqut.’’ April 4, 1948, Schultes & Lopez 
9755.—Same locality and date. Schultes & Lopez 9756; 9757; 9758; 
9759; 9760; 9761.—Rio Negro, Igarapé Imutd, opposite mouth of 
Rio Icana. Tree 60 feet tall, basally swollen, tapering upwards in whip 
fashion. Bark thin, smooth, hard, externally red-brown, internally 
tan. Latex thin, white. Leaflets horizontal-reclinate.’’ April 4, 1948, 
Schultes & Lépez 9762,—Same locality and date. Schultes & Lopez 
9763; 9764.—Rio Negro, Sao Felipe, downstream from Igarapé Tauri, 
below the town. ‘“‘Slender tree 45 feet tall with slightly swollen 
base. Bark outside smooth, dark tan-red ; inside soft, light tan. Leaf- 
lets reclinate-horizontal. Latex thin, white. Crown small.’’ April 5, 
1948, Schultes & Lépez 9766.—Same locality and date. Schultes & 
Lépez 9767.—Rio Negro between Sao Felipe and confluence with Rio 
Uaupés. ““Swamp tree 45-50 feet tall, at base swollen to diameter 
of 12 inches but rapidly tapering upwards. Leaflets strongly reclinate. 
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