112 



MOEPHOLOGY, OE COMPAEATIYE ANATOMY. 



Gamopetalous Corollas have a tube, throat, and limb like the 

 gamosepalous calyx; and similar terms are used to indicate the 

 more common regular forms, such as tubular (fig. 190), campanulate 

 (fig. 194), funnel-shaped or infundibuliform (fig. 195), urceolate 

 (fig. 196), &c., a few others being requisite for the corolla, more 

 especially such as rotate, when the tube is extremely short and the 

 limb spreads at a right angle (Anagallis), hypocrateriform or salver- 

 shaped when a similar limb turns off from a long slender tube 

 (Jasminum, Phlooc) (fig. 197), &c. 



Irregular gamopetalous corollas often furnish important syste- 

 matic characters ; and several of the forms or classes of forms have 

 special technical names. 



The ligulate corolla is tubular at the base ; but disunion soon occurring 

 at one sinus, the limb is turned off to one side in the shape of a flat rib- 

 bon or strap, on the margin of which occur more or less distinct teeth 



Fig. 194. 



Fig. 195. 



Fig. 19G. 



Fig. 194. Campanulate corolla of a G-entian. Fig. 196. Urceolate corolla of a Heath. 

 Fig. 195. Funnel-shaped corolla of Convolvuhts. Fig. 197. Salver-shaped corolla of Phlox. 



indicating the five component petals (fig-. 19.8) j this is especially found 

 in the r&y florets of Composite : a modification with the tube and limb 

 wider in proportion to the length occurs in LobeliacecB. The labiate or 

 bilabiate corolla of the Labiatae (fig. 199) is formed by the two upper 



Eetals of the limb, which are scarcely at all separated, and stand apart 

 :om the three lower or anterior petals, which also are only partially 

 separated^ forming a lower lip opposite the upper one and projecting for- 

 ward from the throat of the corolla : sometimes the upper lip is concave, 

 and is then termed galeate, or helmet-like ; in other cases (Ajuga) it is 

 almost abortive. 



Almost every modification of this form occurs in the Labiatee, ap- 

 proaching to an almost regular tubular corolla in Mentha. This form 

 occurs also in the florets of some Composite and in those of various Dip- 

 sacese, where, however, the upper lip is 3-lobed and the lower 2-lobecl ; 

 in the Honeysuckle the upper lip contains four petals, and the lower is 

 formed by a solitary one. Veronica has an irregular corolla intermediate 

 between bilabiate and rotate (fig. 200). 



