wide between the revolute margins,acute,shortly cuneate 
at base, very thick-coriaceous, with the mid-nerve sulcate 
above and prominent beneath, conduplicate when young: 
petioles 0.8-1.8 cm. long, suleate, laterally compressed. 
Inflorescences densely capitate and axillary, many-flow- 
ered. Flowers apparently subfleshy. Lateral sepals free, 
lanceolate, shightly asymmetric, acuminate, 6 mm. long, 
2mm. wide near the base, 4-nerved. Dorsal sepal similar, 
apparently a little shorter and narrower than the lateral 
sepals. Petals ovate-lanceolate, acuminate, 5.5 mm. long, 
1.8 mm. wide, 8-nerved. Lip 8-lobed near the base, ob- 
long-ovate in outline, minutely clawed,3 mm. long,about 
2mm. wide across the lateral lobes, shortly cuneate to 
the claw; lateral lobes rounded auriculate, relatively 
small; middle lobe ovate-oblong, 2 mm. long, about 1.2 
mm. wide near the contracted base, denticulate-erose on 
the anterior margins, tridenticulate at the subtruncate 
apex; dise 8-nerved, with a pair of keels extending from 
the centre of each lateral lobe to the centre of the middle 
lobe. Column small, about 1.8 mm. long on the dorsal 
surface. Pollinia eight, obliquely complanate-pyriform. 
Another sheet of this collection (Jenman 1989) pre- 
served in the Herbarium of the New York Botanical 
Garden, shows the smallest secondary stem 8.3 em. long 
and one leaf about 1.2 em. wide. 
Octomeria erosilabia differs from O. tridentata Lindl. 
in having commonly longer stems, consistently longer 
leaves, subfleshy flowers, broader petals and erose lip. It 
is vegetatively larger and has a smaller lip than O.igua- 
pensis Schltr. 
British Guiana, Pomeroon River. March 1884. George Jenman 
1989 (Tyrer in Herb. Kew. Durticare type in Herb, N.Y. Bot. Gard. ) 
Octomeria exigua (C. Schweinfurth sp. nov. 
Herba tenuissima, caespitosa. Radices fibrosae, nu- 
[ 86 | 
