O. Davisii are cited as synonyms of one species, Cyrto- 
chilum monachicum, by Krinzlinin Engler Pflanzenr. IV. 
50, pt. 2 (Heft 80) (1922) 47. However, the latter con- 
cept, based upon Oncidium monachicum Reichb.f., is de- 
scribed as having the dorsal sepal reniform, and thus is 
quite dissimilar to that of O. falcipetalum or its forms. 
Apparently Oncidium falcipetalum is a variable species 
as regards floral size and the contour of the petals which 
varies from flat to conduplicate. 
Originating in Venezuela (Merida), this species is also 
recorded from Colombia and Peru. 
Oncidium heteranthum Poeppig & Endlicher Nov. 
Gen. ac Sp. 1 (1886) 34, t. 60; Cogniaux in Martius FI. 
Bras. 8, pt. 6 (1905) 878, t. 87; Krinzlin in Engler 
Pflanzenr. IV. 50, pt. 2 (Heft 80) (1922) 175. 
Oneidium bryolophotum Reichenbach filius in Gard. 
Chron. (1871) 788; Krinzlin in Engler Pflanzenr. LV. 
50, pt. 2 (Heft 80) (1922) 181. 
Oncidium inops Cogniaux & Rolfe in Journ. des Orch. 
3 (1893) 846; 4 (1893) 74. 
Oneidium megalous Schlechter in Fedde Repert. 9 
(1911) 30. 
The above species is extremely variable. This fact has 
led to the proposal of several later concepts, none of 
which, however, seems valid. 
Oneidium bryolophotum, a native of Costa Rica and 
Panama, and represented in the Ames Herbarium by 
Reichenbach’s detailed analyses, by authentic material 
examined by Kriinzlin, and by many Central American 
collections, cannot logically be separated from the earlier 
O. heteranthum trom Colombia, Peru and Bolivia. 
In general, the Central American plants referred to 
O. bryolophotum have a mid-lobe of the lip which is rel- 
atively larger than that of O. heteranthum, but one Costa 
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