The External Form of Plants. 129 - 
It is unusual for the corolla to be green; in the grape-vine 
it is yellowish green. Certain plants, however, which have 
normally a bright-coloured corolla, produce occasionally a 
green one, as occurs in Hydrangea and Lfesperts. 
~The corolla is gamopetalous or sympetalous |less cor- 
rectly ‘monopetalous’], when the petals are more or less. 
coherent; apopetalous or eleutheropetalous |less correctly 
‘polypetalous’|, when they are perfectly distinct ; regular 
_ when they are all alike ; zrreguw/ar when one or more differs 
from the rest in size or form; but in the latter case the 
corolla is always symmetrical. 
The principal forms of the gamopetalous corolla are g/o- - 
bose as in Hrica tetralix (Fig. 240) ; urceolate or urn-shaped 
as in the bilberry (Fig. 241) ; campanu- 
fate or bell-shaped as in Campanula 
(Fig. 242) ; 2nfundibuliform or funnel- 
shaped as in Convolvulus arvensis (Fig. 
Fic. 240.—Globose corolla of 
Erica tetralix (magnified). 
= 
= 
ee = 
SS SS 
—— 
Ig 
a. 
a 
= SG 
LAA 
ZZ 
ee 
Ss 
EEE 
—=>= 
=3 
up? \ i. J ‘| 
wy Ge 
aN 
J 
Fic. 241.—Urceolate corolla Fic, 242.—Campanulate Fic. 243. — Infundibuli- 
of Vacciniune Myrtillus  corollaofthe Canterbury form corolla of Cozvod- 
(magnified). bell. VULUS AYUVERSES « . 
—— 
—| 
243); tubular as in the ‘ florets of the disc’ of many Com- 
posite (Fig. 244); votate as in the borage (Fig. 245); 2ypo- 
crateriform or salver-shaped as in the jasmine (Fig. 247); 
figulate or strap-shaped as in the ‘florets of the ray’ of many 
Composite (Fig. 246); ds/abeate as in most Labiate (Fig. 
K 
