once by having the leaves much less dense and much less 
closely appressed around the stems; where the leaves 
have fallen, the scars are less conspicuous and are more 
distinctly placed on the stem. The former has the stip- 
ules much less conspicuous and spreading than the latter ; 
and it has flowers which are only half as large; slightly 
larger leaves which are more nearly lanceolate-elliptic 
(not oblanceolate) and remotely and obscurely subundu- 
late-denticulate along the entire margin (instead of 
closely and definitely sharp-dentate along the upper half 
of the margin only); petals which are apparently non- 
deciduous, ovate or broader at the base than at the apex 
(instead of conspicuously obovate); and sepals which are 
entire (not serrulate) near the apex. 
The fruit of none of the three species of Leitgebia is 
known. Leitgebiacolombiana flowers on Mount Chiribi- 
quete in May and sets fruit probably from October to 
December. I collected at this locality in May, July, and 
January and was unable to find fruiting material of this 
curious shrub. 
Cotomsria: Comisaria del Vaupés, Macaya-Ajaju River confluence, 
Mount Chiribiquete. Quartzite base. Summit 800-1200 feet above 
forest floor; 1700-2100 feet above sea-level. “‘Small shrub. Flowers 
pinkish.’? May 15-16, 1943, Richard Evans Schultes 5479 (Tyee in 
Herb. Gray). 
CoMBRETACEAE 
Combretum laxum Jacquin Knum. PI]. Carib. 19 
(1760) 115. 
Black & Schultes 46-293 represents the same variant 
of the widespread and variable Combretum lawum which 
occurs in adjacent parts of Amazonian Pert and which 
was recently reported from the Rio Igaraparana in Am- 
azonian Colombia (Schultes in Bot. Mus. Leafl. Harvard 
Tniv. 14 (1949) 40). 
. , , 6 bry . 
Cotomsria: Comisaria del Amazonas, Rio Loretoyacu.  ‘Trepadeira. 
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