We have doubtfully referred to this species plants collected by Dr. Rose on the west coast of Mexico, where they were growing wild; this is some distance from the place where the type was obtained from cultivated plants. These specimens are like this species in having quite glossy joints with few spines. The plants were not in bloom when seen by Dr. Rose in the spring of 1910.
Dr. Griffiths has changed his first name, O. undulata, on account of the use of that name at an earlier time, which was not accompanied, however, by description.
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