Dos, 
PL. CDXXxX. 
ODONTOGLOSSUM CORDATUM unoz. var. AUREUM soar. 
THE CORDATE ODONTOGLOSSUM, YELLOW VARIETY. 
ODONTOGLOSSUM. Vide Lindenia, I, p. 11. 
Odontoglossum cordatum. Pseudobulbis oblongis 
; pressis diphyllis; foliis late-oblongis planis acutis scapo 
squamis carinatis vaginato brevioribus; racemo stricto disticho ; bracteis navicularibus acuminatis membranaceis; 
sepalis petalisque lineari-lanceolatis acuminatissimis; labello cordato acuminatissimo, integerrimo, appendice unguis 
carnosa apice biloba basi utrinque dente unico aucto, columna pubescente clava subaptera. 
Odontoglossum cordatum LINDL. in Bot. Reg., 1838, Misc. 90, et 1845 Misc. 60, n° 33. — KNowL et WEsTCc., 
Flor. Cab., t. 100. — PaxTon Mag. of Bot,, XIII, p. 147. — LinDEN Pescatorea, t. 26. — BATEM. Monogr. Od., 
t. 25. — Gartenfl., t. 356. — WiLuiaMs Orch. Alb., IV, t. 186. 
Var. aureum Hort., WILLIAMS Orch. Alb., XI, t. 489. 
dontoglossum cordatum is one of the most ancient species in the genus. 
It was originally introduced by Mr Gzorce Barker, of Birmingham, 
<3) and flowered for the first time in his collection in 1838, though it soon 
afterwards disappeared from cultivation, in the same way as many other cool 
Orchids, because at this epoch their proper treatment was not understood. It was 
not until 1854 that is was definitely re-introduced into cultivation, by M. J. Linpen, 
and became dispersed among various collections. 
As was remarked by the author of Pescatorea, in describing O. cordatum, this 
species is very nearly allied of O. maculatum, whose history is pretty nearly the 
same, for it also was introduced by Mr Grorce Barker, of Birmingham, was 
soon lost to cultivation, and was re-introduced by M. LinpEn. 
O. cordatum, however, is distinguished from O. maculatum, by its habit, 
its more elongated and narrower sepals and petals, and the more acuminate 
shape and different colour of its lip. 
The typical form has the sepals reddish-brown, tinted with yellow at their 
points, and ornamented with two or three transverse yellow lines at the base ; 
the petals pale yellow releived with large brownish red spots, and suffused with 
brown at the tips, and the lip white or yellowish spotted with brown at the point 
and along the median line from the base. 
The variety aurewm is distinguished by its pale colour, which is almost wholly 
sulphur yellow, on which the spots of the type are but very soa) represented, 
with a pale olive tint. It is therefore a sort of albino, analogous with the ion of 
Odontoglossum Insleayi which was figured in this work under dhe meme of variety 
Imschootianum, and the form of O. Schlieperianum which is cultivated as variety 
xanthinum. 
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