THE FLOWER 247 
of the partridge berry, and the recurved edges of corollas 
like those of the morning-glory and tobacco, over which small 
crawling insects cannot easily climb. 
Of flowers that are pollinated by night moths, some close 
during the day, as the four-o’clock and the evening primrose ; 
and vice versa, the morning-glory, dandelion, and dayflower 
(Commelyna) unfold their beauties only in the sunlight. 
For similar reasons, night-blooming flowers are generally 
white or very light-colored, and shed their fragrance only after 
sunset. A nodding position is assumed by many flowers at 
night, or during a 
shower, to keep the 
pollen from being 
injured by dew or 
rain. 
281. Insect depre- 
oie aac = Tne been Fic. 364.— A flower of the trumpet vine (Tecoma 
tion of honey by radicans) adapted to pollination by humming birds 
flowers is a very es canara et which has been pierced by 
common means of 
attracting insect visitors, and various adaptations, such as 
spurs, sacs, and pockets, are found for protecting it against 
pillage by unwelcome in- 
truders. In general, plants 
that have very long, tubular 
Fic. 365. — Head of the swordbill, a bird corollas, like the trumpet 
adapted to feeding on nectar from long, honeysuckle (Lonicera sem- 
ip nen pervirens) and the trumpet 
vine, are reserving their sweets for humming birds and long- 
tongued moths and butterflies. This protective arrange- 
ment is not always successful, however, against insect depre- 
dators, for it is not uncommon to find such corollas with a 
hole in the tube near the base, made by thieving wasps and 
bumblebees, which by this means get at the honey without 
paying their due tribute of pollen. 
