HYPOPETALER. 345 
This Family is divided by De Candolle into six leading 
tribes, depending on the number and character of the coty- 
ledons. 
I, Anasipex or Prevrorwiz2, in which the two cotyle- 
dons are flat and aceumbent (the embryo curved so that 
the radicle lies on the edges of both).—Cheiranthus. 
Arabis. 
_In the other tribes, the radicle is folded upon the side 
of one of the cotyledons, termed incumbent, 
Pee 
Il. Sisympnipex or Nororniza, in which the incumbent 
_ cotyledons have the radicle folded on their back.— 
Sisymbrium. Erysimum. 
Ill. Raruanrpz or OrtHoriocez; the incumbent co- 
tyledons folded lengthwise. —Crambe. Raphanus. 
IV. Envcarresx or SpraoLopex; the incumbent cotyle- 
dons folded spirally or circinnate.—Erucaria. . 
V. Sunvianms or Dretecotosez; the incumbent coty- 
ledons twice bent or folded.—Subularia. 
VI. Scuizoprtatipz. Four cotyledons.—Schizopeta- 
lum. 
These are divided into subsections, according to the strue- 
ture of the pericarp. / 
Economican Prorerties.—This is a family of great im- 
portance in an economical point of view. Many of them 
contain a considerable quantity of mucilage, mixed, however, — 
with an acrid principle ; when the latter is softened by eul- 
Bovtion: thy bocce ant sad sorte SACS 
heir acridity is owing to a volatile inciple, which is very — 
Seg een Serie 
