and unusually sparse, coagulating easily to relatively elastic gum. No 
buttressed roots. Growing in light forest on white sand near rills. 
Arara-seringa.’’ Richard Evans Schultes & Joao Murca Pires 9050.— 
Same locality and date. ‘“‘Columnar, non-buttressed tree 65-75 feet 
tall, 1 foot in diameter. Bark thin, soft, outside light yellowish tan, 
inside white. Latex very sparse, white, thick. Arara-seringa da terra 
Sirme.”’ Richard Evans Schultes § Joao Murca Pires 9064,.—Same local- 
ity and date. ‘‘Arvore de 15 m.; tronco cilindrico, sapopema muito 
pequena; casca externa marron clara com leve escamacao; latex es- 
casso; flér branca na ponta dos galhos. Vive na caatinga juntamente 
com Cunuria Spruceana, C. crassipes, Eperua purpurea, FE. leucantha, 
Monopteryx Uaucu etc.’’ Joao Mura Pires 971.—Same locality. ‘‘Fruit 
green, turning yellow. Columnar tree with yellowish, smooth, thin 
bark. Latex sparse, white.’’ February 3-6, 1948, Richard Evans 
Schultes & Francisco Lopez 9681.—Same locality and date. “‘Columnar 
tree 70 ft. tall. Latex thick, white, sparse. Flowers yellow.’’ Richard 
Evans Schultes & Francisco Lopez 9693.—Same locality and date. “‘La- 
tex white, sparse. Crown heavy. Flowers whitish cream, Columnar 
tree 60 ft. tall.’’ Richard Evans Schultes & Francisco Lopez 9694.— 
Same locality and date. ‘‘Columnar, unbuttressed tree 70 ft. tall. 
Bark smooth, yellowish. Latex white. Fruit green. Arara-seringa.’’ 
Richard Evans Schultes & Francisco Lopez 9695.—Rio Taraira basin, 
headwaters of Igarapé Abit. July 7, 1948, Richard Evans Schultes 
1O199A, 
CotomB1a: Comisaria del Vaupés, vicinity of Montfort Mission, Rio 
Papuri. Alt. about 200 m. ‘“‘Slender, infrequent trees averaging 25— 
30 m. in height and 50 cm. in diameter. Trunk not buttressed. Bark 
grey, thin and hard, and difficult to tap. Latex very scanty, coagu- 
lating toa gummy, non-elastic mass. Small, trispermate capsules, re- 
sembling those of arara-seringa, Micrandra siphonioides, but considera- 
bly elongated. Not well known, one or two individuals hesitatingly 
called them either mahawakpuh or buhuwakpuh, but it is doubtful if 
either would be generally recognized as applicable to this species.’’ 
August 28, 1943, Paul H. Allen 3109.—Comisaria del Vaupés, Rio 
Negro, San Felipe (opposite San Carlos, below Guainia-Casiquiare con- 
fluence). ““Columnar tree about 60 feet tall. Bark rather yellow- 
brown, thin, smooth. Latex thick, white, sparse. No buttresses. In 
light caatinga-forest.’’ June 1948, Richard Evans Schultes & Francisco 
Lépez 10034.—Comisaria del Vaupés, Rio Taraira, above lowest rapids. 
July 11, 1948, Richard Evans Schultes 102034. 
Venezueia: Territorio del Amazonas, Rio Negro, San Carlos. “‘Cor- 
pulent tree, columnar, 70 feet tall, in light caatinga-forest near brook- 
let. Bark smooth, tawny brown or yellow. Latex not abundant, 
white.”* Richard Evans Schultes & Francisco Lépez 10033. 
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