MONOPETALEZ—HYPOCOROLLER. 303 
_ there are 2 cells, and 2 parietal ee eH where there is only 
leell. — 
The Gentian resemble the Apocynez considerably. The 
_ former are distinguished by being generally herbs, having a 
_ persistent corolla, with an imbricated exstivation, pericarp a 
capsule, and no milky juice. 
% Exampies.—Centaury (Erythrea Centaurium), Buck- 
_ bean or Marsh Trefoil (Menyanthes trifoliata) Field Gen- 
_ Mepictnat Prorerties.—Bitterness is the prevailing pro- 
_ perty of this order ; the plants it contains are generally tonic — 
and stomachic. Yellow Gentian (Gentiana lutea) is much 
_ employed in medicine on account of these valuable qualities ; 
_ the root is the part used. G. purpurea, G. punctata, and G. 
Pannonica possess similar properties, and are used in Ger- 
many ; and G. Amarella, G. cruciata, G'. campestris, and 
enyanthes trifoliata are also bitter, and sometimes used. 
G. Catesbai is used in North America as a substitute for 
G. lutea. Erythrea Centaurium is the centaury of the 
pharmacopeeias ; the flowering tops are the parts used, and 
are deemed antiseptic as well as bitter. Menyanthes trifo- 
_ liata is also reckoned diuretic and purgative ; the leaves are 
the officinal parts. Worm-grass (Spigelia marilandica) is 
_ purgative and anthelmintic. Frazera carolinensis has the 
Properties of calumba root. 
Officinal Plants. 
Gentiana lutea. 
Erythrea Centaurium. 
Menyanthes trifoliata. 
Spigelia marilandica. 
