412 MR. B. CLARKE ON THE STRUCTURE AND AFFINITIES 
flower no positive difference is apparent except in the carpels being right and left of the 
axis, instead of anterior and posterior: and in its deficiency of floral envelopes, it may, as 
far as relates to-the corolla, be compared to the Stilbaceæ, near allies of 7 erbenacee, the 
female flowers of which are apetalous. 
The position of the Batideæ, therefore, appears undoubtedly to be with the mono- 
petalous families; and however contrary to the rules of affinity it would have appeared 
only a few years since, this makes it in some degree probable that Callitrichacee should 
also be stationed there, and near Batideæ, as the ovary has precisely the same structure, 
being 4-celled, and consisting of two carpels, right and left of the axis. In Callitriche, 
however, the ovules are suspended, amphitropal, with the raphe next the placenta, in which 
it corresponds with Boraginee, or very nearly so*; the seed is albuminous, and the 
cotyledons are very short, as in Stilbaceæ, with which it further agrees in its anther, which 
closely resembles that of Campylostachys in shape, and in the peculiarity of the two cells 
being confluent at the apex, so that at the time of dehiscence it appears as if it had but 
one cell. 
Callitriche may be compared with Elatineæ, especially if the structure of the ovary of 
Tetradiclis can be considered as analogous to that of Callitriche ; but Batis does not 
appear to have any affinity with the polypetalous families, except that the long claws 
of its petals are like those which occur in Caryophyllacee. Callitriche differs from Eu- 
phorbiaceæ in its amphitropal ovules; besides which, hermaphrodite flowers are not 
uncommon, 
2. Note on the Structure and Affinities of Vochysiaceæ. 
One of the most remarkable characters in this family is that the carpel when single is 
with the single carpel posterior; and these characters occur in Daphnaceæ, of which the 
Vochysiaceæ may be a polypetalous form +, standing in the same relation to the Chrys0- 
balanee and Leguminose, and especially to the former, as Daphnace to Proteacee. 
The relation, however, between 7. ochysiaceæ and Daphnacee is rather one of analogy 
than affinity, although perhaps there is no character to separate them except the absence 
* + . 
ad ^is Boragineæ the Sier IS scarcely suspended, being attached near or at the base of the cell, at the inner angle ; 
ut the raphe of the amphitropal ovule is on its under surface—which is, doubtless, equivalent to the ovule being 
