6 ON THE STRUCTURE OF CRUCIFEROUS FLOWERS. 
petals of those plants which, when cultivated, have a tendence to 
‘fasciculation, adding chacune d'elles se dédouble pour en former 
deux.* Tt is probable, however, that the celebrated professor of 
Geneva considered this a merely organic multiplication, since in the 
lines which immediately follow, speaking of several plants where 
this “dédoublement” has taken place only in a portion of the 
stamen, he looks upon it as the result of two stamens plus ou 
moins soudées ensemble inférieurement. 
This theory of the dédoublement of the two longer stamens in 
this group is confirmed by numerous facts, both normal and 
anomalous. 1. In many Cruciferae and more particularly in the 
Clypeola cyelodontea, Del. the filaments of the solitary stamen are 
furnished with two teeth, one on each side, whilst those of the 
double stamens have but one on their outer side; if we join these 
two stamens together so that they form but one, a bidentate 
filament will result entirely similar to those of the solitary stamens.+ 
2. In other Cruciferee a longer or shorter portion of the 
filament remains simple. Thus, in the Szerigma tomentosum, D.C.,1 
the division takes place as far as the middle; in the Anchoninm 
Billardieri, D.C.,|| in a third part only of the upper portion of 
the filament. Here the position of the longer stamens, double 
only in their upper portion, is exactly the same as that of the 
solitary stamens. 
~ 8. In the Vella pseudocytisus Liun., we find in the place of 
the double stamens, a single one: its filament being frequently 
rather broader, sometimes divided only at its summit, sometimes 
entirely undivided, but bearing in that case an anther, wholly, or 
partially geminate. 
= 4. Many Cruciferæ become tetrandrous by pelorization, others 
are normally so.$ In either case the four stamens are then equal. 
* Mém. sur les Crucif. 1821. 
T See the note at the end of M. Delile's memoir on the C. cyclodontea (Bull. de 
la Soc. d'agr. de l Hérault). See likewise C. A. Mong. Das Alyss. minutum, tab. 1, 
YT (A. minutum,) tab. 2 E (A. Snyrneum,) tab. 2, 1 F (4. minimum) and 3 E 
(A. fulvescens.) 
t Mém. Crucif. tab. 1, fig. 25. l| Ibid . tab. 1, fig. 26. 
4 M. Delile has remarked that the Draba muralis Lin. in its w state shout = 
_ Montpellier has constantly only four stamens. 
