Gart. Berlin 7 (1917) 92, nomen nudum, in clavi; in 
Engler Pflanzenr. IV. 50, pt. 2 (Heft 80) (1922) 39, 
fig. 2C, a-c. 
In his original description of Oncidium ventilabrum 
Reichenbach admitted that this species was close to O. 
undulatum Lindl., but he adduced several supposedly 
weighty reasons for separating them. Among other fea- 
tures he said, ‘‘Zuniichst hat unsre Art zweimal so grosse 
Bliithen, die seitlichen Sepala breiter, das obere linger. 
Der mit dem Fuss der Siitule verwachsene Lippennagel 
is viel linger... .”° 
In the Ames Herbarium there are several records of 
Oncidium ventilabrum (a drawing of a flowering branch 
and numerous floral analyses) from the Reichenbach 
Herbarium, and these show a rather striking agreement 
both in size and form of sepals and petals with those 
shown in the plate of the type of Cyrtochilum undulatum 
(l.c.). Moreover, the lip is depicted as sessile in both 
concepts. The form of the lip and the calli at the base 
of the lamina are supposed to be different in the two 
species, but in the drawings of O. ventilabrum there is a 
rather wide range in these features. Furthermore, in the 
remarks about O. undulatum (in Bonpl. 2, p. 108) Reich- 
enbach described a lip-callus which is rather similar to 
that shown in O. ventilabrum. 
It appears to be the wise procedure to eliminate the 
necessity of straining for supposed differences between 
these two concepts and to consider them conspecific. 
However, since there is an earlier and different On- 
cidium undulatum, it is necessary to reject this specific 
epithet and to adopt the next earlier name, Oncidiwm 
ventilabrum. 
Sigmatostalix Reichenbach filius in Bot. Zeit. 10 
(1852) 769; Schlechter in Fedde Repert. 15 (1918) 139; 
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