176 ELEMENTS OF BOTANY 
occurs in many kinds of flowers. In some, the figwort and 
the common plantain for example, the pistil develops before 
the stamens, but usually the reverse is the case. The Clero- 
dendron, a tropical African flower (Fig. 131), illustrates in 
| Fig. 182. Two Flowers of 
Common Sage, one of 
them visited by a Bee. 
ments which the stamens and 
a most striking way the 
development of stamens 
before the pistil. The in- 
sect visitor, on its way to 
the nectary, can hardly fail 
to brush against the pro- 
truding stamens of the 
flower in its earlier stage 
(at 4), but it cannot deposit 
any pollen on the stigmas, 
which are unripe, shut to- 
gether, and tucked aside 
out of reach. On flying to 
a flower in the later stage 
the pollen just acquired 
will be lodged on the 
prominent stigmas and 
thus produce the desired 
cross-pollination. 
210. Movements of Floral 
Organs to aid in Pollination. 
— Besides the slow move- 
pistil make in such eases 
as that of the Clerodendron, already described, the parts 
of the flower often admit of extensive and rather quick 
movements to assist the insect visitor to become dusted 
or smeared with pollen. 
1C. Thompsoniz. 
