242 BOTANICAL INFORMATION. 
because of having a bicarpellary unilocular ovarium with the 
placenta either parietal, or at any rate not in the axis, and a 
flower more allied to the Convolvulacee and Boraginee than 
to the preceding orders. -From an observation in p. 564, it 
appears that had he sooner observed them, he would have in- 
cluded the greater portion, if not all Hydroleacee in the present 
order; and it would appear correctly so ; but too great faith 
has been hitherto placed upon Choisy's monograph, who 
distinetly states that all the genera have a bilocular ovary; 
whereas De Candolle finds it always unilocular, except in 
Hydrolea itself, where the dissepiment is of the same nature 
as that of Bignonia. inh 
- In the details of the order the author has carefully revised 
the monograph published by G. Bentham in the 17th vol. of 
the Linnean Transactions, made several corrections and 
additions, and attaching generic importance to the presence 
or absence of the squamæ in the tube of the corolla, has 
established three new genera, the validity of which remains 
perhaps yet to be tested. — — ; 
- The Polemoniaceæ had, perhaps, been better placed between 
Boraginee and Solanacee. They are, however, anomalous 
among Corolliffere by the constancy (unless in accidentally 
abnormal flowers) of the tricarpellary ovary. They possess 
the contorted æstivation of Apocynacee and Genlianacee, 
the axile placentation of Solanee and Scrophulariacee, with 
the inflorescence also, if not the habit, of some groups in the 
two latter orders. They are worked up by Mr. Bentham from 
the materials contained in his own herbarium, and in those 
of Sir W. J. Hooker, the British Museum, and some other 
London collections down to the spring of 1843, since which 
time but little has been added to the order. The genus 
Cyananthus, usually referred to this order, has been omitted, 
for reasons which the author has forgotten to give in the 
Prodromus. The insertion of the stamens, the structure of 
the ovary and fruit, the milky juice, the habit, &c., all indi- 
cate the close affinity of these plants to Wahlenbergia among 
Campanulacee, from which they only differ, as Lobelia Xala- 
