inflorescence, in the slightly shorter floral bracts and in 
the somewhat narrower dorsal sepal and petals. There- 
fore, it seems reasonable to consider this form as reduci- 
ble to _Y. squalens. 
Cyrtopera scabrilinguis, exemplified by a photograph 
of the type from the Lindley Herbarium at Kew, is a 
plant with a rather loose raceme, having flowers of appar- 
ently the same size and shape as those of Y. squalens. 
Moreover, this record bears two drawings of the lip which 
appear nearly identical with the lip of X. squalens, a spe- 
cies which has a more or less compact raceme. In the 
photograph the floral bracts are indistinct, but under 
Mawillaria scabrilinguis they are described as shorter 
than the [pedicellate] ovary, unlike those of Y. squalens, 
in which the floral bracts commonly more or less exceed 
the ovary. Several specimens determined as X. scabri- 
lingue have a lip with the mid-lobe rather more ovate 
than obovate or oval as in XY. squalens, but that portion 
when expanded approximates the mid-lobe of the latter 
species. Finally, the color of the flowers in both con- 
cepts, while apparently variable, is often closely similar. 
It seems to be entirely logical, therefore, to regard 
Xylobium scabrilingue as conspecific with YX. squalens. 
This concept, like most widespread species, is very var- 
lable, both in vegetative and floral size. One Peruvian 
collection (Klug 10123) even has a pseudobulb bearing 
three leaves, instead of the usual two leaves. The color 
of the flowers varies from white to yellowish or pinkish, 
streaked with violet, the lip being much darker violet. 
Xylobium squalens is recorded chiefly from South 
America (Brazil, Venezuela, Ecuador, Peru and Bolivia), 
with one record from Costa Rica in Central America. 
Xylobium squalens (Lind/.) Lindl. var. gracile 
(Schitr.) C. Schweinfurth comb. nov. 
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