Epidendrum concavilabium C.Schweinfurth sp. 
nov. 
Herba epiphytica, robusta, humilis. Caules foliorum 
vaginis imbricantibus omnino obtecti. Folia pauca, dis- 
ticha, oblongo-elliptica, apice bilobata.  Inflorescentia 
brevis, pauciflora. Bracteae conspicuae, equitantes, pa- 
tentes, dorso valde carinatae. Flores carnosi. Sepalum 
dorsale elliptico-ovatum, acutum. Sepala lateralia obli- 
quissime semiorbiculari-ovata, acuta. Petala lanceolato- 
elliptica, obtusa. Labellum columnae apici adnatum, 
simplex, valde concavum, basi cordatum, apice biloba- 
tum. Columna generis. 
Plant robust, caespitose, epiphytic. Roots fibrous, 
numerous. Stems entirely concealed by imbricating com- 
planate sheaths which are mostly leaf-bearing, up to 10.8 
em. long. Leaves up to five, oblong-elliptic, distichous 
and widely spreading, successively larger upward, up to 
10 em. long and 5.2 cm. wide, abruptly much smaller 
below, bilobed at the apex with rounded lobules, appar- 
ently fleshy in the living specimen. Peduncle up to the 
raceme very short, about 8.5 cm. long, mostly concealed 
by one equitant carinate spathe. Raceme short and stout, 
5- to 6-flowered, about 7 em. long and 8.5 em. wide near 
the base. Floral bracts equitant, ovate when spread, deep- 
ly carinate with the keel decurrent on the rachis and pe- 
duncle, up to 2.5 em. long. Flower, especially the sepals 
and lip, rather fleshy. Sepals and petals horizontally 
spreading or recurved. Dorsal sepal elliptic-ovate, about 
12.3 mm. long and 8 mm. wide, abruptly acute with a 
retrorse mucro on each side of which are two minute sub- 
triangular lamellae, 7-nerved. Lateral sepals semiorbic- 
ular-ovate, very asymmetric with the posterior margin 
nearly straight and the anterior margin strongly convex, 
about 13 mm. long and 9.2 mm. wide near the middle, 
acute, mucronate with a short dorsal dentate keel, about 
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