TROPICAL AMERICAN ORCHIDS 
dissimilar, and the column nearly ebrachiate. [Fig. 6: 1, 
labellum and column, front view X 4. 2, petal X 2 3, 
lateral sepal X 3. 4, flower, front view X about 3.] 
Panama, Cana and Vicinity, R. S. Williams 975, April 
4, 1908. 2000-6500 feet altitude. Flowers yellow. (Type 
in Herb. Ames No. 10748.) 
Oncidium panduriforme A. & S. sp. nov. Herba pro 
genere mediocris, caespitosa. Radices crassae. Folia in basi 
congesta, lineari-oblonga, vaginis imbricantibus articulata. 
Inflorescentia paniculata; rami rari. Flores parvi. Sepala 
lineari-oblonga, acuta, lateralia valde carinata. Petala 
latiora, oblongo-lanceolata. Labellum panduriforme; discus 
in basi callo crasso obscure tricarinato ornatus. Columna 
ebrachiata. 
Plant caespitose, medium-sized for the genus, more than 
60 cm. tall to the upper part of the inflorescence (incom¬ 
plete). Roots fibrous, very stout, larger above the basal 
part, glabrous. Leaves congested at the base, linear-oblong, 
14.8-39.9 cm. long, 1.95-2.7 cm. wide; the outer smaller, 
articulated to distichous imbricating conduplicate sheaths; 
the outermost sometimes 4.4 cm. long, 1.5 cm. wide; all the 
leaves acute or acuminate at the apex, which is inconspicu¬ 
ously and obliquely bilobed, commonly gradually tapering 
toward the base, chartaceous, many-nerved with seven to 
nine nerves conspicuous beneath. Inflorescence paniculate, 
much surpassing the leaves. Peduncle up to the panicle ap¬ 
parently a little shorter than the leaves, somewhat laterally 
flattened, with about three remote tightly clasping infundib- 
uliform sheaths which are 8-10 mm. long. Panicle 31.8 cm. 
or more long, with branches (often bi- or tri-furcate) 2.7 
(rarely)-8.1 cm. apart. Rachis very loosely flowered, more 
or less fractiflex. Flowers small, about 2 cm. in diameter; 
perianth segments spreading, subfleshy (except the labellum), 
and indistinctly nerved. Lateral sepals linear-oblong, free 
to the base, about 10.7 mm. long, 2 mm. wide, acute, nar¬ 
rowed below, with a conspicuous fleshy keel on the outer side 
increasingly prominent toward the apex, slightly oblique. 
Dorsal sepal similar, linear-oblong, about 11.2 mm. long. 
77 
