FLOWER ADVERTISEMENTS 85 
of such markings, as seen in the genus Erodium, is 
shown in Fig. 14. It is interesting to note the various 
ways in which flowers render themselves conspicuous 
in order to attract insects. In the majority of Seed 
Plants, such as the Buttercup, Pea, Rose, Foxglove, 
it is the corolla, formed either of separate petals, as 
in the first three, or of petals fused together, as in the 
last, which by its bright colour or colours renders the 
flower noticeable. In other species the calyx takes on 
Fic. 14.—FLOWER OF ERODIUM PETR#UM. 3. 
the function of advertisement, the corolla being in 
comparison insignificant—we may study examples of 
this in the Anemones, Hellebores, and Marsh Mari- 
gold (Caltha palustris). It is worth examining this 
last, to see how its coloured sepals resemble and fulfil 
the same function as the petals of its cousins the 
Buttercups. Or, again, sepals and petals may com- 
bine in showiness, both sets being brightly coloured 
in one or more tints—compare the Columbine 
(Aquilegia), Larkspur (Delphinium), Milkwort (Poly- 
gala), and the marvellous flowers of Orchids. In the 
great group of the Monocotyledons, indeed, to which 
