On the Structure, Development, and Affinities 
of Trapella, Oliv., a new Genus of Peda- 
lineae. 
BY 
F. W. OLIVER, B.A., F.L.S., 
Scholar of Trinity College , Cambridge . 
With Plates V, VI, VII, VIII, IX, and Woodcut 7. 
I N a collection of plants received at the Kew Herbarium 
from Dr. Augustine Henry, from central China, in February 
of last year, there were, along with many other new and 
interesting plants, some specimens of a bilabiate aquatic with 
curiously appendaged fruits and inferior ovary. This plant, 
recalling in habit and in its appendaged fruits the well-known 
Trap a natans, was made by my father the type of a new 
genus, Trapella , with specific name sinensis. It is described 
and figured in the ‘ leones Plantarum 1 ,’ and placed pro- 
visionally in the Order Pedalineae. Amongst the observations 
made upon it there is the following : — c The form of the 
ovules remains uncertain, the stigma is very curious and of, 
as yet, uncertain structure, and there are one or two other 
features of biological interest that we want more light upon.’ 
The possession of these marked peculiarities— unintelligible 
without proper investigation of material preserved in alcohol — 
and, if a true Pedalinea, its exceptional habit, made it desirable 
that further material should be obtained. On this account 
Dr. Henry was communicated with, the result being that in 
1 D. Oliver, in Hook. Ic. PI. 1595. 
[Annals of Botany, Vol. II. No. V, June 1888.] 
