FORMS OF REGULAR AND IRREGULAR COROLLAS. 235 
5. Rotate or wheel-shaped, when the tube is short, and the 
limb at right angles to it, as in the Forget-me-not (fig. 482) and 
Bittersweet (Solanwm Dulcamara). 
6. Urceolate or urn-shaped, when the corolla is swollen in 
the middle, and contracted at both the base and apex, as in the 
Purple Heath (fig. 483), and Bilberry (Vaccinwwm Myrtillus). 
Fie 483. Fria. 484. Fic. 485. 
Fig. 483. Flower of a species of Heath (Zrica). c. Calyx, within which is 
an urceolate corolla, ¢, 1—-Fig. 484. Ringent or gaping corolla of the 
Dead-nettle (Lamium album), showing the entire upper lip. Fig. 485. 
Back view of the flower of a species of Teucrium, showing the bifid upper 
lip of the corolla. 
B. Irregular Monopetalous Corollas.—Of these we shall de- 
scribe the following :— 
1. Labiate, bilabiate, or lipped.—When the parts of a corolla 
are so united that the limb is divided into two portions which 
are placed superiorly and inferiorly, the upper portion overhang- 
Fic. 486. Dies 4 Sis 
Fig. 486. Flower of the Rosemary (Rosmarinus) with upper lip divided.—— 
Fig. 487, Front view of the labiate corolla of Galeobdolon, with trifid lower 
lip. 
ing the lower, and each portion so arranged as not to close the 
orifice of the tube, thus resembling in some degree the lips 
and open mouth of an animal (figs. 484-487), the corolla is 
termed labiate, bilabiate, or lipped. The upper lip is composed 
of two petals, which are either completely united, as in the 
White Dead-nettle (jig. 484), or more or less divided, as in the 
