Two new orchid species in the Oncidiinae, Cochlioda mixtura from Bolivia and Odontoglossum ariasii from Peru, are described and illustrated. Both species belong to what is here referred to as the Cochlioda clade, which includes species of the Odontoglosswn astranthum Linden & Rchb. f. complex and of genera Cochlioda Lindl. and Solenidiopsis Senghas. A synopsis of the clade with an illustrated key to the species is provided. Oncidium aurarium Rchb. f. (syn.: Odontoglossum trilobum Schltr.) belongs to the same clade as Odontoglossum ariasii, and a nomenclatural change is made. Symphyglossum sanguineum (Rchb. f.) Schltr. is transferred to the genus Odontoglossum Kunth, based on morphological features supported by DNA sequence analysis.
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