BRACTS AND FLORAL LEAVES. OI 
it had been partly split open and spread out. The same pecu- 
liarity is carried to a greater extent in the florets of dande- 
lion and the ray florets of daisy. The strap-shaped limb in the 
former case has five teeth at its termination, the latter only three 
(cf. fig. 44). The surface of the corolla may be glabrous or 
present hair structures or hair-like outgrowths. Its texture is 
usually delicate, corresponding with its deciduous nature. The 
colour may be simple, or streakings and mottlings may occur; 
bright tints are the rule. 
Structure.—Petals (and petaloid sepals) are covered on either 
side by a delicate epidermis. Internally they are made up of 
one or more layers of spongy parenchyma (cf. p. 65), traversed 
by delicate vascular bundles, which, as in the foliage leaf, give a 
veined appearance. ‘The colours of flowers are due to pigments 
contained in the epidermal cells. Blue and red are dissolved 
in the cell-sap, as in larkspur and rose. Yellow and orange are 
usually contained in variously shaped colour bodies, e.g., in Indian- 
cress (garden nasturtium), where a large number are found in 
each cell. 
