Professor Reichenbach has written several articles in the _Gardeners' Chronicle_ about this plant, in one of which he deplores, and most justly, the wanton waste and havoc committed by collectors; who, instead of contenting themselves with a moderate number of specimens, gather them by hundreds, or even by thousands, thus imperilling the very existence of species which, like the present, are believed to possess only a very restricted habitat. Nor does this recklessness often benefit their employers, for in most cases, the larger the consignment, the smaller the chance of its prospering on its way. The woodcut is copied from a photograph of a small specimen of _O. vexillarium_, taken in New Grenada, in the act of flowering. [Illustration] Plate XXX [Illustration: Odontoglossum Roezlii.] PLATE XXX. ODONTOGLOSSUM ROEZLII. ROEZL'S ODONTOGLOSSUM. O. (PHALÆNOPSIDEA) affine O. vexillario, pseudobulbis ovato-oblongis ancipitibus compressis 1-2-phyllis, foliis lineari-ligulatis inferne striatis pedunculis 1-3-floris longioribus; sepalis oblongo-ligulatis acutis, petalis sublatioribus; labello a basi angustâ sagittatâ cuneato flabellato obtuse bilobo; carinis ternis in imâ basi; prepositâ lamellâ transversâ seu callis parvis geminis; columnâ apterâ. ODONTOGLOSSUM ROEZLII, _Rchb. fil. Xenia Orchidacea_, ii.; _idem in Gard. Chron._ p. 1302, (_cum Xylo_) 1873. Habitat in N. GRENADA, _Roezl_; _Backhouse in Gard. Chron._ p. 1334, (1873). DESCRIPTION. _A compact plant, of which the_ PSEUDOBULBS _are ovate-oblong, 1-2 inches long and much compressed; these bear one or two bright green linear acute_ LEAVES, _which are remarkable for their parallel streaks--nine in number--on the under side, and are from six to ten inches long, and about ½ inch wide. The_ SCAPES _or_ PEDUNCLES _are shorter than the leaves, and bear from one to three (possibly more) large and beautiful flowers, which with the exception of some markings at the base of the petals and on the lip are of snowy whiteness_. SEPALS _oblong-ligulate pointed at the extremity, fully an inch long_. PETALS _rather wider than the sepals and with a rich crimson blotch at their base_. LIP _wedge-shaped, expanding from a narrow sagittate base into a broad two-lobed disk, an inch and a half wide, white with some bright yellow markings near the foot and in the region of the_ CREST; _the latter being formed by three slightly raised "carinæ" or ridges near the base on either side, traversed by two moderate sized calli placed in front_. COLUMN _wingless_.