Comisaria del Putumayo, alta cuenca del Rio Uchupayaco, al sur- 
oeste de Puerto Limén, alt. 300 m., 27-28 febrero, 1942, Richard 
Evans Schultes 8341; Rio Putumayo, Puerto Ospina y los alredadores, 
alt. ca. 250 m., 23-25 marzo, 1942, Richard Evans Schultes 3426; Rio 
San Miguel 6 Sucumbios, Conejo y los alredadores, en frente de la 
Quebrada Conejo, alt. ca. 300 m., 2-5 abril, 1942, Richard Evans 
Schultes 3543, ““yoco colorado”? (all in Herb. Nac. Colomb, and in 
Econ. Herb. Oakes Ames). 
Comisaria del Putumayo, Mocoa y los alredadores al norte, alt. 
750-850 m., 3-7 diciembre, 1941, Richard Evans Schultes & C. Earle 
Smith 8045 (Keon. Herb. Oakes Ames). 
Comisaria del Putumayo, Umbria, 0° 54’ N., 76° 10/ W., alt. 325 
m., January-February 1931, G. Klug 1930, “verde yoco’’ (U.S, Nat. 
Herb. No. 1518076); same locality and date, G. Klug 1937, ‘“taruco 
yoco’’ (U.S. Nat. Herb. No. 1518083); same locality and date, G. 
Klug 1946, “‘yagé yoco’’ (U.S. Nat. Herb. No. 1518085); same lo- 
cality and date, G. Klug 1947, *‘canangucho yoco’’ (U.S. Nat. Herb. 
No. 1518086). 
Ecuapor: Rio San Miguel 6 Sucumbios, entre el Rio Putumayo y 
la Quebrada Teteyé, alt. 260 m., “*voco colorado,’’ 29 marzo, 1942, 
Richard Evans Schultes 3476 (Econ, Herb. Oakes Ames). 
° 
Paullinia Yoco belongs to the section Hnourea (Aubl.) 
Radlk. of the genus according to Radlkofer’s recent treat- 
ment of the Sapindaceae (Pflanzenr. LV, 165 (1981) 232 
—Sapindaceae I). This section contains eight species, all 
rather closely allied and all from northern South America 
(the Guianas, northwestern Brazil, southern Colombia 
and Peru). Paullinia Yoco appears to be most closely 
related to P. clathrata Radlk. of the Amazonas of Brazil, 
a region floristically very like the Colombian Amazonas 
and Putumayo where the new species is native. Paullinia 
clathrata (according to descriptions and a photograph of 
the type) differs from P. Yoco in being much larger vege- 
tatively, in having subdentate instead of entire leaves, 
and in having leaf-pubescence. ‘There are also several 
floral characters which serve to separate the two species. 
In Radlkofer’s key to the section Z7nowrea, the type ma- 
terial of Paullinia Yoco traces out to P. conduplicata 
(Klotzsch) Radlk. However, Paullinia Yoco is distin- 
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