PSEUDOBULBS _oval, compressed, about an inch long, glossy, bearing solitary lanceolate somewhat recurved_ LEAVES, _which are shorter than the upright 1-(rarely 2-)flowered_ SCAPES. BRACTS _not half so long as the three-cornered ovary_. SEPALS _and_ PETALS _equal, linear, acuminate, of a dull olive-green, with a few faint transverse streaks of brown on their inner side_. LIP _white, rhomboidal, subrotund, with its edges eroded, and its unguis, or claw, hollow, truncate, free, and divided at top into two, or rather into four lobes, the two foremost of which resemble teeth_. COLUMN _slender, wingless_. There is an air of quaintness about this little _Odontoglossum_ which, insignificant though it be, is spread over a range of territory far more extensive than is occupied by any other member of the genus; for it has been found in Mexico by Hartweg, in Guatemala (on the Volcan del Fuego) by Skinner, and in Veraguas by Warszewicz! At Knypersley, where the figure was taken, the species flowers freely in the winter and spring, and is managed (in a cool house) without the slightest difficulty. DISSECTIONS.--1. Column and lip (_magnified_), seen sideways; 2. Ditto, ditto, in front. Plate XIV [Illustration: Odontoglossum Alexandræ.] PLATE XIV. ODONTOGLOSSUM ALEXANDRÆ. PRINCESS OF WALES' ODONTOGLOSSUM (BLUNT'S VARIETY). O. (ISANTHIUM, _Lindl._) pseudobulbis ovatis compressis 1- vel 2-phyllis, racemo simplici multifloro foliis subæquali, bracteis minoribus cochleatis acutis, floribus membranaceis pedicellis æquantibus, sepalis petalisque sæpius subæqualibus (interdum petalis multo latioribus), sepalis lanceolatis acuminatis petalis ovato-lanceolatis acutis undulato-laceris, labello breviore unguiculato formâ diversissimâ, nunc sepalis conformi nunc subpanduriformi, apice emarginato (sæpius mucrone adjecto) margine undulato integro vel sæpius dentato acuto apice recurvo, disco maculato, cristâ simplici bilamellatâ. Columna arcuata clavata, alata, alis laceris. ODONTOGLOSSUM ALEXANDRÆ, _Bateman in Gardeners' Chronicle_, 1864; _et in Proceedings R. Hort. Soc._ _p._ 186 (1864). ODONTOGLOSSUM BLUNTII, _Reichenbach fil._ Habitat in NOV. GRANADA, prope Pacho, 7-8000 p., _Weir_, _Blunt_. DESCRIPTION.