Page:An introduction to physiological and systematical botany (1st edition).djvu/285

 Rh Poppy tribe, Papaver and Glaucium, I cannot find that the flower-stalk is subsequently enlarged, nor in any manner altered; while in genera without number, whose calyx is permanent, the stalk becomes not only more woody, but often considerably thickened.

II. . The Corolla, vulgarly called the leaves of the flower, consists of those more delicate and dilated, generally more coloured leaves, which are always internal with respect to the calyx, and constitute the chief beauty of a flower. In the Rose the Corolla is red and fragrant; in the Violet purple; in the Primrose yellow.

This term includes two parts, the Petal, Petalum, and the Nectary, Nectarium. The former is either simple, as in the Primrose, in which case the Corolla is said to be monopetalous, of one petal; or compound, as in the Rose, in which it is polypetalous, of several. The Nectary is sometimes a part of the petal, sometimes separate from it.

A monopetalous Corolla consists of two parts; the tube, tubus, the cylindrical part