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Rh The next genus of Crucifcræ to be noticed is , a fragment of the original species of which is in the collection. There are also several specimens of a plant, found in the desert, supposed to be new, and which, though with- out flowers, and considerably different in the form of its stigma, I am inclined, from the resemblance in habit, in pubescence, in sihcula, in seeds, and especially from the exact similarity in the structure of the septum, to refer to the same genus.

As the introduction of the structure of the dissepiment 217 into the generic characters of Cruciferæ is now proposed for the first time, and as I believe that its texture and appearance should always be attended to in constituting genera in this family of plants, I shall here offer a few remarks respecting it.

According to the particular view which I briefly but distinctly published in 1818, and which M. De Candolle first adopted in 1821, of the composition of the pistillum in Crucifera), the dissepiment in this family is necessarily