Fig. 1. 
Corolla 
1 i 
E ^ 
E 3 — a pa " V 
E Stamens 
r 26 
E 
i a (--8-) 
1 lé 
1 T 
Calyx 
This figure illustrates the method of obtaining di-trimerous whorls from the 2 divergence. The numbers arc 
arranged in accordance with this angular divergence of 144°. Nos. 1-5 constitute a cycle of leaves; but 1-6 E 
complete 2 coils or circles when projected on a plane as for whorls. Herein No. 6—that is, the first member E 
of the second cycle—is taken over to complete the di-trimerous whorls supplying the calyx. Nos, 7-12, 13-18, 
similarly determine the di-trimerous whorls of the corolla and stamens; but the pistil is represented as 
composed of 3 carpels, because this number really completes a single cycle of the $ divergence; all the other 
whorls, as stated, being deducible from the 2 divergence. 
The dotted lines, together with the initial line in front, show the final positions taken up by the members of 
the flower thus giving rise to the three di-trimerous whorls and one trimerous whorl. 
