Tas. 8873. 
ODONTOGLOSSUM HuMEANUM. 
South Mexico. 
OrcHIDACEARE, Tribe VANDEAE. 
Oponroctossum, H. B. et K.; Benth. et Hook. f. Gen. Plant, vol. iii. p. 561. 
Odontoglossum Humeanun, Reichb. f. in Gard. Chron. 1876, vol. v. p. 170; 
Reichenbachia, ser. 1, vol. ii. p. 75, t. 82; Cogn. et Gooss. Dict. Ic. Orch., 
Odontoglossum, t. 7; Rolfe in Orch. Rev. 1901, p. 260; 1919, pp. 4, 41; 
inter O. maculatum et O. Rossii hybridum. 
Herba epiphytica; pseudobulbi aggregati, ovoideo-elliptici, subeompressi, 
4-6 cm. longi, basi vaginis ovato-lanceolatis obtecti, apice monophylli. 
Folia lanceolato-oblonga, acuta, basi conduplicata et attenuata, 8-20 cm. 
longa, 2°5-4 cm. lata. Pedunculi suberecti vel arcuati, 15-20 cm. longi, 
3-4-flori. Flores speciosi, pallide lutei, sepalis et petalorum basibus 
brunneo-maculatis; bracteae ovato-lanceolatae, acutae, 2-2°5 cm. longae ; 
pedicelli 3-5-5 em. longi. Sepala oblongo-lanceolata, acuminata, 3°5-4 em. 
longa. Petala elliptica, acuta, subundulata, 3°5 cm. longa, apice sub- 
recurva. - Labellum late unguiculatum, 3-lobum, 3 cm. longum et latum ; 
lobi laterales parvi, subconcavi, lobus intermedius ample subcordato- 
orbicularis, subundulatus; discus crista crassa apice 2-loba instructus. 
Columna clavata, 2 cm. longa, alis subobsoletis.—Odontoglossum cor- 
datum, Paxt. Mag. Bot. vol. xiii. p. 147, tab. ic.; non Lindl. O. aspersum, 
Reichb. f. in Gard. Chron. 1879, vol. xi. p. 266; Warn. Orch. Alb. vol. vi. 
t. 245; Lindenia, vol. xv. t. 679 (var. Bosscherianum). 0. Youngii, 
Gower in Orch. Alb. vol. ix. t. 406; Rolfe in Gard. Chron, 1891, vol. x. 
p. 670. O. Ashworthianum, Hort. ex Gard. Chron. 1898, vol. xxiii. p. 189 ; 
Orch. Rev. 1898, p. 126. O. Rossii, var. Humeanum et var, aspersum, 
Veitch, Man. Orch. pars 1, p. 65.—R. A. Roure. 
The history of this handsome Odontoglossum is of 
unusual interest. The late Professor Reichenbach in 
1876 described as 0. Humeanum a plant imported from 
Mexico which had then flowered in the collection of Mr. 
W. Burnley Hume. The characters were such as to lead 
Reichenbach to think it a natural hybrid; the parents 
suggested were QO. Rossii and O. ccrdatum, two Mexican ~ 
species described by Professor Lindley. Three years 
later another plant flowered with Messrs. J. Veitch and 
Sons. This Reichenbach described as O. aspersum, again, 
however, in the belief that it was a hybrid, but with the 
Ocroper-DeceMseEr, 1920. 
