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The true variety of O. Hallii stands in much the same case. To obtain it the explorer must march in the bed of a torrent and on the face of a precipice alternately for an uncertain period of time, with a river to cross about every day. And he has to bring back his loaded mules, or Indians, over the same pathless waste.
Authorities admit now that a very great proportion of our Odontoglossums are natural hybrids; so many can be identified beyond the chance of error that the field for speculation has scarcely bounds. O. excellens is certainly descended from O. Pescatorei and O. triumphans, O. elegans from O. cirrhosum and O. Hallii, O. Wattianum from O. Harryanum and O. hystrix.
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