Wild Flowers: An Aid to Knowledge of Our Wild Flowers and Their Insect VisitorsBlanchan, Neltje
Science
Wild Flowers: An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors
Blanchan, Neltje
Wild flowers -- North America
Everywhere at the North we come across this interesting, rather
shrubby plant, with its pretty but inconspicuous little
rose-veined bells suggesting pink lilies-of-the-valley. Now that
we have learned to read the faces of flowers, as it were, we
instantly suspect by the color, fragrance, pathfinders, and
structure that these are artful wilers, intent on gaining ends of
their own through their insect admirers. What are they up to?
Let us watch. Bees, flies, moths, and butterflies, especially the
latter, hover near. Alighting, the butterfly visitor unrolls his
long tongue and inserts it where the five pink veins tell him to,
for five nectar-bearing glands stand in a ring around the base of
the pistil. Now, as he withdraws his slender tongue through one
of the V-shaped cavities that make a circle of traps, he may
count himself lucky to escape with no heavier toll imposed than
pollen cemented to it. This granular dust he is required to rub
off against the stigma of the next flower entered. Some bees,
too, have been taken with the dogbane's pollen cemented to their
tongues. But suppose a fly call upon this innocent-looking
blossom? His short tongue, as well as the butterfly's, is guided
into one of the V-shaped cavities after he has sipped; but,
getting wedged between the trap's horny teeth, the poor little
victim is held a prisoner there until he slowly dies of
starvation in sight of plenty. This is the penalty he must pay
for trespassing on the butterfly's preserves! The dogbane, which
is perfectly adapted to the butterfly, and dependent upon it for
help in producing fertile seed, ruthlessly destroys all poachers
that are not big or strong enough to jerk away from its vise-like
grasp. One often sees small flies and even moths dead and
dangling by the tongue from the wicked little charmers. If the
flower assimilated their dead bodies as the pitcher plant, for
example, does those of its victims, the fly's fate would seem
less cruel. To be killed by slow torture and dangled like a
scarecrow simply for pilfering a drop of nectar is surely an
execution of justice medieval in its severity.
In July the most splendid of our native beetles, the green dandy
(Eumolpus auratus) fastens itself to the dogbane's foliage in
numbers until often the leaves appear to be studded with these
brilliant little jewels. "It is not easy," says William Hamilton
Gibson, "to describe its burnished hue, which is either
shimmering green, or peacock blue, or purplish-green, or
refulgent ruby, according to the position in which it rests." But
it is not golden, as its specific name would imply. It confines
itself exclusively to the dogbane. To prevent capture, it has a
trick of drawing up its legs and rolling off into the grass its
body so cleverly matches.
Public-domain text, read in full here on John Shaqi.
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