FLORAL DIAGRAMS. 79 
whorls or parts of whorls which have been suppressed is 
shown by a dot, and of those which have been aborted or pro- 
duced imperfectly by a shaded dot. For example, the ordi- 
nary chickweed has only 3 stamens, though derived from a 
typical 10-stamened flower. The empirical and theoretical 
diagrams of the flower are shown in the accompanying figures, 
the first showing the cohesion and estivation of the parts as 
they actually exist, the second serving to show what parts of 
the flower have been suppressed in development. (For other 
examples of the theoretical diagram, see p. 97 and p. 103.) 
Fig. 150. Floral diagram of Chickweed—theoretical. 
