mucronate, 7 mm. long, nerved; sepals asymmetric, nar- 
rowly oblong, subtruncate, mucronate, 10 mm. long, 
connate for 1 mm.; petals imperfectly known; ovary 
globose, placentae apical. 
CotomsBia: Comisaria del Vaupés, Mesa La Lindosa. Small range 
15-20 km. south of San José del Guaviare. Alt. 400-600 m. Decem- 
ber 13-15, 1950, Jesus M. Idrobo & Richard Evans Schultes 645 (Tver 
in U.S. Nat. Herb. No. 2025998). 
Navia heliophila ZL. B. Smith ex Schultes in Bot. 
Mus. Leafl. Harvard Univ. 16 (1954) 194, t. 26, figs. 
o-5, 1. 21. 
These additional collections of Navia heliophila indi- 
cate that it is a rather frequent species on the cliffs of 
the middle course of the Rio Apaporis. 
CotomsBia: Comisaria del Amazonas-Vaupés, Rio Apaporis, Raudal 
de Jirijirimo y alrededores. Alt. ca. 250 m. “‘On rocks on face of 
ledge. Flowers white; anthers yellow.’’ June 13, 1951, Richard Evans 
Schultes & Isidoro Cabrera 12457.—Same locality. ‘‘On rocky ledge in 
sun. Flowers white; anthers yellow. Leaves glossy.’’ September 16, 
1951, Schultes & Cabrera 14050.—Comisarias del Amazonas-Vaupés, 
Rio Apaporis, Raudal Yayacopi (La Playa) and vicinity. Quartzite base. 
Alt. about 800 feet. General location: Lat. 0°5’S, Long. 70°30/ W. 
‘On cliffs. Flowers white; anthers yellow.’’ February 15, 1952, 
Schultes & Cabrera 15380. 
PONTEDERIACEAE 
Pontederia cordata Linnaeus Sp. Pl. (1758) 288. 
Pontederia cordata, rare in the headwaters of small 
rills and creeks which flow into the main rivers of the 
Comisaria del Vaupés, seems never to have been re- 
ported from Amazonian Colombia. 
Cotompta : Comisaria del Vaupés, Rio Paca (tributary of Rio Papuri). 
Alt. about 650 feet. General location: Lat. 0°30’ N, Long. 70°10/ W. 
‘*In headwaters of Rio Paca. Flowers white. In water.’’? June 1-3, 
1953, Richard Evans Schultes & Isidoro Cabrera 19526. 
VELLOZIACEAE 
Vellozia Dumitiana R. EF. Schultes in Mutisia 12 
(1952) 2, t. 6, 7. 
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