Amblostoma gracile Garay var. robustum C. 
Schweinfurth var. nov. 
Herba caulibus crassioribus et foliis latioribus et florum 
colore diversa et labelli lobis subaequalibus a specie dif- 
fert. 
Plant relatively robust, with a stout creeping rhizome, 
about 88 cm. high. Stems approximate, spreading- 
ascending, fusiform, several-jointed, entirely concealed 
nearly to the apex by several close, scarious, evanescent, 
tubular sheaths, 15-17.5 cm. long. Leaves four, variable 
in shape and size, clustered near the apex of the stem, 
oblong-lanceolate to linear, narrowed above to an abrupt, 
subacute and apiculate or obtuse apex, slightly narrowed 
below to a sessile clasping base, up to 12 cm. long and 
1.5 cm. wide. Inflorescence solitary, strict, racemose, 
up to about 16 cm. long (incomplete in our specimen), 
subdensely many-flowered nearly to the base, slightly 
pubescent. Floral bracts spreading, triangular-lanceolate, 
acuminate. Pedicellate ovaries about twice as long as the 
bracts, densely pubescent. Flowers very small, whitish 
green with pale brown sepals and incurved segments. 
Sepals very fleshy. Dorsal sepal oblong-elliptic, obtuse 
and apiculate, strongly concave, about 4.2 mm. long and 
2.1 mm. wide. Lateral sepals similar, obliquely elliptic- 
oblong and slightly broader above the middle, acute, 
deeply concave, about 4.6 mm. long and 2.4 mm. wide. 
Petals oblanceolate-linear, obtuse, about 4mm. long and 
0.9 mm. wide, slightly oblique. Lip entirely adnate to 
the column, small, tripartite, about 1.8 mm. long; lat- 
eral lobes obliquely obovate-subquadrate, partially con- 
cealed by an ovate-oblong, incurved lamina which is free 
along the anterior margin; mid-lobe slightly longer and 
narrower, ovate-oblong, subacute, with three narrow 
fleshy calli of which the central one is much the longest. 
Column relatively large, obliquely obovoid-infundibuli- 
[42 | 
