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
It well repays one to observe the relative times of maturing
anthers and stigmas in the flowers, as thereby hangs a tale in
which some insect plays an interesting role. The figwort matures
its stigma at the lip of the style before its anthers have
ripened their pollen. Why? By having the stigma of a newly opened
flower thrust forward to the mouth of the corolla, an insect
alighting on the lip, which forms his only convenient landing
place, must brush against it and leave upon it some pollen
brought from an older flower, whose anthers are already matured.
At this early stage of the flower's development its stamens lie
curved over in the tube of the corolla; but presently, as the
already fertilized style begins to wither, and its stigma is dry
and no longer receptive to pollen, then, since there can be no
longer any fear of self-pollination - the horror of so many
flowers - the figwort uncurls and elevates its stamens. The
insect visitor in search of nectar must get dusted with pollen
from the late maturing anthers now ready for him. By this
ingenious method the flower becomes cross-fertilized and wastes
the least pollen.
Bees and wasps evidently pursue opposite routes in going to work,
the former beginning at the bottom of a spike or raceme, where
the older, more mature flowers are, and working upward; the wasps
commencing at the top, among the newly opened ones. In spite of
the fact that we usually see hive bees about this plant,
pilfering the generous supply of nectar in each tiny cup, it is
undoubtedly the wasp that is the flower's truest benefactor,
since he carries pollen from the older blossoms of the last
raceme visited to the projecting stigmas of the newly opened
flowers at the top of the next cluster. Manifestly no flower,
even though it were especially adapted to wasps, as this one is,
could exclude bees. About one-third of all its visitors are
wasps.
HAIRY BEARD-TONGUE
(Pentstemon hirsutus; P. pubescens of Gray) Figwort family
Flowers - Dull violet or lilac and white, about 1 in. long, borne
in a loose spike. Calyx 5-parted, the sharply pointed sepals
overlapping; corolla, a gradually inflated tube widening where
the mouth divides into a 2-lobed upper lip and a 3-lobed lower
lip; the throat nearly closed by hairy palate at base of lower
lip; sterile fifth stamen densely bearded for half its length; 4
anther-bearing stamens, the anthers divergent. Stem: 1 to 3 ft.
high, erect, downy above. Leaves: Oblong to lance shape, upper
ones seated on stem; lower ones narrowed into petioles.
Preferred Habitat - Dry or rocky fields, thickets, and open
woods.
Flowering Season - May-July.
Distribution - Ontario to Florida, Manitoba to Texas.
Public-domain text, read in full here on John Shaqi.
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