This is a very distinct species, as remarkable among _Odontoglossa_ with its white and purple flowers, as is _Oncidium incurvum_, with blossoms of similar hues, among the innumerable members of that still more extensive genus. Although originally discovered by Colonel Hall more than a quarter of a century ago, no genuine plants--there have been impostors in plenty--seem to have reached Europe alive before the year 1871, when it was introduced by M. Linden; by whom also, in the following spring, flowering specimens were exhibited at South Kensington and universally admired. According to Lindley, the species is nearly allied to his _O. ramosissimum_, from which, indeed, he at one time failed to distinguish it. M. Linden's plant, which is faithfully rendered in Mr. Fitch's drawing, does not exactly answer to the descriptions in the Folia Orchidacea either of _O. angustatum_ or _O. ramosissimum_, but is apparently a connecting link between the two, whence I infer the probability that both the above supposed species will eventually be found to be one and the same. The plant is still exceedingly scarce, and as it is indistinguishable in habit from many other _Odontoglossa_ derived from the same rich country (Peru), I would warn cultivators against purchasing any specimens that have not actually proved themselves to be true. It belongs to the cooler sections of its race, and must be treated accordingly. Plate XXVII [Illustration: Odontoglossum coronarium.] PLATE XXVII. ODONTOGLOSSUM CORONARIUM. ROYAL ODONTOGLOSSUM. O. (TRYMENIUM) rhizomate caulescente, pseudobulbis brunneis ovalibus compressis monophyllis, foliis rigidis coriaceis basi canaliculatis acutis racemo multifloro dense racemoso subæqualibus vel longioribus, bracteis linearibus canaliculatis ovario triplô brevioribus, sepalis petalisque subrotundis unguiculatis planis margine crispis, labello longê cuneato retuso basi auriculis unidentatis subfalcatis obtusis subtus in unam connatis acuto, inter auriculas tuberculis duobus hoc didymo illo inferiore simplici; clinandrio subserrato lobis rotundatis (_Lindl._) ODONTOGLOSSUM CORONARIUM, _Lindl. Folia Orchid._; _Linden_, _Pescatorea_, t. 47. Habitat in N. GRENADA, _propè_ La Baja, Pamplona, (alt. 7000 ft.,) _Schlim_. DESCRIPTION.