‘ os 
The External Form Gs Riatisr 1), 4,-° 133 
; corona). The rosaceous corolla (Fig. 257), consists of five 
petals which are not unguiculate, with perigynous adhesion, 
7.e. attached to that part of the urceolate or hypocrateriform 
- calyx where the separate sepals spring from the coherent 
base, and is especially characteristic of a section of the order 
Rosaceee. The métreform corolla (Fig. 257) which occurs 
_ Fic. 256.—Longitudinal section through the rosaceous F1G.257. —Mitrzeform flower 
flower of the rose; the pistil seated in the base of of the grape-vine (mag- 
the urceolate calyx. nified). 
_ in the grape vine, consists of five petals which are coherent 
at their tips, and become detached at their base on the ex- 
pansion of the flower, thus covering the inner petals of the 
flower like a cap. 
The petals usually een off when they fall by an articu- 
lation at their base, but often remain attached and withered, 
as in Campanula [when they are said to be marcescent|. The 
corolla never takes any part in the formation of the fruit, as 
is sometimes the case with the calyx. 
THE PERIANTH. 
When the Perianth (ze. the two floral envelopes, the 
calyx and corolla) is green, as in the elm and Aumex (Figs. 
258, 259, 260), it is said to be sepaloid; when bright- | 
coloured or white, asin Orchidez and Liliacez (Fig. 261), it 
= 
