12 ON THE STRUCTURE OF CRUCIFEROUS FLOWERS. 
planted on a gland (Lestidoudois.) They are often not even 
accompanied by a gland at their base; an absence easily ac- 
counted for by the gemination itself of the stamens. At the 
same time that excess of nutrition has acted upon these organs, the 
receptacle on which they are placed has been operated upon in- 
versely, and its development stopped. There are, however, some 
examples where multiplication of organs takes place without the 
absorption or disappearance of glands. In a flower of Cheiranthus 
Cheiri which had become octandrous, observed by M. Seringe,* 
of which we have already spoken, though the inferior stamens 
were geminated, the glands that subtended them were of their 
usual size. 
In Diplotaris muralis, immediately below the double stamens, 
there is a small narrow gland which may be considered as the rudi- 
ment of the glandular ring. A similar gland occurs in the Brassica, 
and Sisymbria (Lestiboudois.)+ In Koniga there are two, perfectly 
distinct, placed side by side. This is a still nearer approach to the 
glandular ring. 
It is remarkable that in Matthiola and Cheiranthus, where there 
is no trace of glands, the double stamens are considerably longer 
than the others: in Diplotawis they are but little longer, and in 
Koniga all are nearly equal in length. 
In the Draba muralis where no gemination has taken place, and 
where the glands, almost equal, form a sort of circular disk, the 
stamens are equal in height and form a regular verticil. 
GYN(GCEUM. 
-~ To explain the nature of the fruit in Cruciferæ, De Candolle 
imagined the siliquelle or carpidium “à trois pièces, deux latérales 
portant des ovules sur leur disque intérieur; et une extérieure ne 
portant point d'ovules." 1 
The fruit of Crucifer he supposed to be made up of two 
of these siliquelles united together. This curious but very inad- 
* Bull. bot. 1880, p. 113. ES 
T Plée. Types des fam. Crucif. 
+ Théorie élem. ième éd. p. 133. 
