15 J 



ODONTOGLOSSUM ROSSII; var. ACUMINATUM. 



{Ross s Odontoglossum ; acuminate variety.) 

 LINNEAN SYSTEM. " No 129 NATURAL ORDER. 



GYNANDRIA MONANDRIA. ORCHID A CE^E § VANDEiE. 



GENERIC CHARACTER. 



Odontoglossum. (Hums, et Kunth.) Perianthium explanatum, sequale ; sepalis petalisquc 

 angustis acuminatis liberis. Labellum indivisum, ecalcaratum, unguiculatum ; ungue cum basi 

 columnar continuo ; lamina patente basi cristata. Columna erecta, membranaceo-marginata, 

 apice utrinque alata. Anthera bilocularis. Pollinia 2, solida, caudiculd lineari, glanduld hamata. 

 Herbse epiphytes, pseudo-bulbifera?. Folia plicata. Scapus terminalis, vaginatus. Mores 

 speciosi. — (Kunth.) 



Perianth explanate, equal; sepals and petals narrow, acuminate, free. Lip undivided, 

 spurless, clawed, tbe claw continuous with the base of the column ; lamina spreading, crested at 

 the base. Column erect, with a membranaceous margin, winged on each side at the apex. 

 Anther 2-celled. Pollen-masses 2, solid, with a linear caudicula, and a hooked gland. Epiphytic, 

 pseudo-bulbous plants. Leaves plicate. Scape terminal, sheathed. Flowers handsome. 



SPECIFIC CHARACTER. 



O. Rossii ; pseudo-bulbis ovatis, csespitosis, ancipitibus, monophyllis ; foliis oblongo-lanceolatis, 

 scapo radicali subbifloro longioribus ; bracteis membranaceis, carinatis, acuminatis ; sepalis lineari- 

 lanceolatis, carinatis, acuminatis, patentibus ; petalis oblongis, obtusis, revolutis ; labello subro- 

 tundo-ovato, emargin#to, undulato, lamellis unguis confluentibus, rotundatis, denticulis 2 

 anterioribus obtusis ; columna aptera pubescente. — (Sertum Orchid, t. 25.) 



Pseudo-bulbs ovate, clustered, two-edged, bearing on,e leaf ; leaves oblong-lanceolate, longer 

 than the radical, somewhat 2-flowered scape ; bracts membranaceous, keeled, acuminate ; sepals 

 linear-lanceolate, keeled, acuminate, spreading ; petals oblong, obtuse, revolute ; lip roundish- 

 ovate, emarginate, undulate, lamella? of the claw confluent, rounded, with two anterior obtuse 

 little teeth ; column wingless, pubescent. 



Var. acuminatum. Foliis lanceolatis, pergameneis ; sepalis lanceolatis, acuminatis ; labello 

 subrotundo-ovato, indiviso. 



Leaves lanceolate, parchment-like ; sepals lanceolate, acuminate ; lip roundish-ovate, 

 undivided. 



Descr. — Pseudo-bulbs much compressed, the recent ones lenticular, smooth, the older ones 

 wrinkled, invested with the Avithered sheaths. Leaves recurved, about 6 inches long, of a 

 parchment-like substance. Scape erect, 2-flowered, with a bract about the middle, and one at 

 the base of each pedicel. Flowers from two and a half to three inches across. Sepals spreading, 

 narrow, lanceolate, acuminate, with a fleshy green keel, a cream-coloured ground, slightly tinted 

 towards the base with yellowish-green, and copiously marked with blotches, and short transverse 



