traces (Fig. 10 B); thus the traces for adjacent lateral 
stamens of the one side are represented by the compound 
trace, al +A2, and on the other side by the similar trace, 
a2+ A8. 
General Discussion 
Ovary. In recent years the nature of superior and in- 
ferior ovaries has raised a good deal of controversy. The 
evidence at hand points out that the inferior ovary in at 
least the majority of instances is a product of adnation of 
floral whorls, though there seems to be some evidence as 
to its receptacular nature in a few genera or groups of 
plants. The orchid ovary, as has been said before, is trav- 
ersed by six main vascular traces that run throughout the 
length of the ovary proper without any kind of splitting, 
and the further division begins only at about the inser- 
tion level of the perianth and other floral organs. This 
condition may be looked upon as a result of adnation in 
its extreme degree of expression. The irregularity seen in 
the method of origin of the six main traces of the ovary 
in different genera of orchids may also be correlated in 
some way with the high degree of adnation. 
Perianru. The whorls of perianth members exter- 
nally suggest considerable distinctness. In general, those 
of the outer whorl are uniform in appearance, whereas 
those of the inner whorl are variable. Particularly does 
the labellum (median petal) assume a series of varied pat- 
terns in size, shape and color. Whatever may be the 
outward manifestation, internally each of them (sepals 
as well as petals) receives a median and two marginal 
traces. Quite often the marginal traces of one whorl of 
the perianth members are derived from the traces belong- 
ing to the perianth members of the other whorl. Ana- 
tomically, all of the perianth members are thus of the 
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