VANILLA. . 249 
This is worth enquiring into, so far as I know the advo- 
cates for 6 carpella have not cited Vanilla. 
Is there any instance known of the placenta of one car- 
pella being bipartite ? 
One of the most constant and peculiar marks of Orchidez 
disappears here, the pollen grains being quite simple, even at 
a rather early period, so with the costz of the ovarium which 
are here totally wanting. 
Yet in the labellum, column, and Anther-case, it is as 
Orchideous as any. 
The articulation of the perianth, or the ovary, is exceed- 
ingly curious, being I think, unknown in other monocoty- 
ledons, because it is scarcely compatible with the hypothesis 
of ovarium adherens ; can it be analogous to the articulation 
of the stalk in Smilacine. 
Vaniile sp. Pl. CCLXXXI. 
I. Plant natural size. 
2. Bud laterally, a carina of petals, which is exactly on the 
same plane with the sepal. 
3. Petals viewed laterally, shewing their imbricated æstiva- 
tion, and the union of all the parts of the corolla at 
the base. 
4. Petal back view. 
9. Columna and labellum in zestivation, the terminal part of 
the lip is bent abruptly back. 
6. Lateral view of the same, pulled out. 
7. Front of ditto from the flower, after expansion, a the 
cottony ball, 4 4 the two fleshly processes, barbate on the 
inner faces, with white processes, and elastically appli- 
cate to the cottony ball. 
8. Apex of columna etc. in front. 
9. Do. laterally. 
10. Anther front. 
]1. Do. base. 
12. Column apex of. Anth. removed and rostellum or anti- 
cous stigma pushed up to shew the stigmatic orifice, 
a 2 
