OEGANS OF EEPBODUCTION. 



227 



of the 

 n the 



Fig. 468. Fig. 469. 



3. InfundibuUform or funnel-shajped, where the form 

 corolla is that of an inverted cone, like a funnel, as 

 Tobacco (Nicotiana) (Jig. 464). 



4. Hypocrateriforyn or salver-shaped {fig. 465), when the 

 tube is long and narrow, and the limb placed at right angles to 

 it, as in the Primrose. 



5. Rotate or wheel-shaped, when the tube is short, and the 

 limb at right angles to it, as in Forget-me-not {Myosotis pa- 

 lustris) (fig. 466), and Bittersweet {Solajium Dulcamara). 



6. Urceolate or pitcher-shaped, when the corolla is swollen in the 

 middle, and contracted at both the base and apex, as in the Purple 

 Heath (Erica) (fig. 467) and Bilberry ( Vacci'nium Myrtillus), 



B. Irregidar Monopetalous Corollas. — Of these we shall de- 

 scribe the following : — 



1. Labiate or lipped. — When 

 the parts of a corolla are so united 

 that the limb is divided into two 

 portions which are placed su- 

 periorly and inferiorly, the upper 

 portion overhanging the lower, and 

 each portion so arranged as not to 

 close the orifice of the tube, so that 

 the whole resembles in some degree 

 the lips and open mouth of an ani- 

 mal (/^5. 468 — 471), the corolla is 

 termed labiate, bilabiate, or lipped. 

 The upper lip is usually composed 

 of two petals, which are either com- 

 pletely united, as in the White 

 Dead-nettle (Lamium album) (fig. 

 468), or more or less divided, as in the Rosemary (Eos^narinus) 

 (fig. ^70) and Germander (TeMcnwwj) (;?^. 469); and the lower lip 

 of three, which are also, either entire, as in the Rosemary (fig. 470), 

 or bifid, as in Lamium (fig. 468), or trifid, as in Galeobdolon (fig. 

 471). When a labiate form of corolla has the upper lip much 

 arched, as in the White Dead-nettle (Lamium) (fig. 468), it is 

 frequently termed ringent or gaping. The labiate form of corolla 

 gives the name to the natural order Labiatse, in the plants be- 

 longing to which it is of almost universal occurrence. It is 

 found also in certain plants belonging to some other orders. 



2. Personate or masked. — This form of corolla resembles the 

 labiate in being divided into two lips, but it is distinguished by 

 the lower lip being approximated to the upper, so as to close 

 the orifice of the tube or throat. This closing of the throat is 

 caused by a projection of the lower lip called the palate. It 

 occurs in the Snapdragon (Z^^'. 472), Tosid&ax (Linaria) (fig. 473), 

 &c. In the species of Calceolaria the two lips become hollowed 

 out in the form of a slipper, hence such a corolla, which is but 



Q2 



Fig. 468. Rinerent corolla of 



Dead-nettle {Lamium ) Fig. 



469. Back view of the flower of 

 a species of Teiicriimi, showing 

 the bifid upper lip of the corolla. 



