Very few of those who grow Odontoglossums know much about the "Trade,"
or care, seemingly. It is a curious subject, however. The genus is
American exclusively. It ranges over the continent from the northern
frontier of Mexico to the southern frontier of Peru, excepting, to speak
roughly, the empire of Brazil. This limitation is odd. It cannot be due
to temperature simply, for, upon the one hand, we receive Sophronitis, a
very cool genus, from Brazil, and several of the coolest Cattleyas; upon
the other, _Odontoglossum Roezlii_, a very hot species, and _O.
vexillarium_, most decidedly warm, flourish up to the boundary. Why
these should not step across, even if their mountain sisters refuse
companionship with the Sophronitis, is a puzzle. Elsewhere, however,
they abound. Collectors distinctly foresee the time when all the
districts they have "worked" up to this will be exhausted. But South
America contains a prodigious number of square miles, and a day's march
from the track carries one into _terra incognita_. Still, the end will
come. The English demand has stripped whole provinces, and now all the
civilized world is entering into competition. We are sadly assured that
Odontoglossums carried off will not be replaced for centuries. Most
other genera of orchid propagate so freely that wholesale depredations
are made good in very few years. For reasons beyond our comprehension as
yet, the Odontoglossum stands in different case.
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