46 
SEED DISPERSAL. 
Of a like nature are fruits of thistles, fireweed, prickly 
lettuce, sow thistles, scabiosa, valerian, cat-tail flag, cotton 
grass, some anemones, smoke tree, virgin’s bower, and 
some of the grasses. 
27. How the lily sows its seeds. — Ripened pods of lilies 
usually stand straight up on a stiff, elastic stem ; begin- 
Fig. 33. — At the left a dry fruit of a lily opening to permit seeds to dry and the wind 
to enter ; to the right, a fruit later in the season. Two views of a flat seed. 
ning at the top, each one slowly splits into three parts, 
which gradually separate from each other. Why do they 
not burst open all of a sudden, like pea pods, and shoot 
the seeds all about and have the job done with ? Or why 
does not the pod burst open at the lower end first, instead 
of the upper? 
Observe that the three opening cells are lashed together 
loosely with a latticework. No slight breeze can dis- 
