lares, 0.7 mm. longae, hispidulae. Alabastra globosa. 
Flores parvi, aperti 8-10 mm. in diametro. Sepala quin- 
que, inaequalia; exteriora tria membranacea, ovata, apice 
rotundata, 5-6 mm. longa, 8 mm. lata, glaberrima, alba, 
inflexis cum marginibus; interiora duo membranacea, 
suborbicularia, 5.5 mm. longa, 4.5 mm. lata, alba. Petala 
quinque, membranacea, alba, rotundato-ovata, 6 mm. 
longa, 4.5 mm. lata. Stamina circiter 28, basi albo-bar- 
bata; filamenta 2 mm. longa. Antherae plusminusve 1.8 
mm. longae. Ovarium globosum, stylis quinque filiformi- 
bus, 8 mm. longis, apice in stigmata leviter dilatatis. 
Fructus maturus adhue ignotus. 
The peculiar fragile texture of the highly coriaceous 
and rigid leaf of this new species distinguishes Saurauia 
rigidissima from the other known Colombian members 
of the genus. According to the field notes, the leaves are 
fragile even in life. There are also minor distinguishing 
characters in the hairs of the petiole and branch. 
Cotompia: Departamento del Valle, “‘Cordillera Occidental, Los 
Farallones, vertiente oriental: abajo de Almorzadero, bosque 2850- 
2880 m. alt. Arbolito. Hoja grande, coriacea, rigida, fragil, verde 
grisacea haz, verde claro envés. Caliz verde padlido. Corola blanca,’’ 
July 25, 1946, J. Cuatrecasas 21716 (Tyrer in Herb. Gray). 
FLACOURTIACEAE 
Mayna amazonica (Martius ex Hichler) J. F. 
Macbride in Field Mus. Publ. Bot. 18, pt. 4 (1941) 16. 
Rather widespread in the Amazon drainage-area, 
Mayna amazonica extends up to the very slopes of the 
Andes in eastern Colombia. This is the second collection 
from the Comisaria del Putumayo (Schultes in Caldasia 
3 (1945) 439). Among the Kofiin Indians, the bark of 
the trunk of this small tree is used as an ingredient of 
curare. 
Cotomsia: Comisaria del Putumayo, Rio San Miguel 6 Sucumbios, 
[ 284 | 
