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Some of the many visitors to goldenrod. © Beatriz Moisset
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Many
flowers are not particularly selective; they welcome all kinds of visitors. They
are wide open, easily accessible, thus many insects can reach the nectar and/or
pollen regardless of whether their tongues are long or short. Such flowers
provide a convenient standing platform to save their visitors the inconvenience
of hovering over them. Their structure is simple so the pollinators don’t need
to figure out how to open them in order to reach their rewards. Goldenrod is a
fine example.
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Monarch butterfly on goldenrod. © Beatriz Moisset |
I have
spent countless happy hours observing goldenrods and photographing their
numerous visitors. The one most common in my area is the Canada
goldenrod. Several hundreds of species visit their flowers. Bear in mind that
not all flower visitors qualify as pollinators. Some are not efficient at
carrying pollen, or sit in one place for a long time and never make it to
another plant. Such is the case of ambush bugs, whose only concern is to snare
hapless pollinators to make a meal out of them. If you are interested on
photographing and identifying pollinators this is a good place to start.
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Metallic green bee. © Beatriz Moisset |
This
plant blooms in the fall. It often gets blamed for allergies, but the real
culprit is another plant that grows close by, sometimes intermingled with
goldenrods, ragweed. Its flowers are inconspicuous because its pollen gets
carried by the wind, not by officious pollinators. This is how it gets into our
nostrils and causes our suffering. The much maligned goldenrods have larger,
heavier and stickier grains of pollen that cannot get airborne and that require
help from visitors.
Two
states, Kentucky and Nebraska, have the goldenrod as their state
flower. It is not clear which species of goldenrod Kentucky
picked, but it is likely the Canada
goldenrod (Solidago altissima). Nebraska’s choice is
clearer, the giant goldenrod (Solidago gigantea). South Carolina, not satisfied with a state
flower, also has a state wildflower. It is the Canada goldenrod. It is worth
mentioning that Delaware
has a state herb, the anise-scented
or sweet goldenrod (Solidago odora).
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Bumble bee on sunflower. © Beatriz Moisset |
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Coreopsis. © Beatriz Moisset |
Two other state
flowers also have mass appeal. Like goldenrod, they are members of the daisy or
aster family, easy to access by different kinds of visitors. They are Kansas’ sunflower (Helianthus annuus) and Maryland’s Black-eyed
Susan (Rudbeckia hirta). It is worth mentioning here that two states, Florida and Mississippi,
chose the tickseed (Coreopsis spp.) as a state wildflower in addition to
their official state flowers, the orange blossom and the magnolia, respectively.
Kentucky: Goldenrod
Nebraska: Goldenrod
South Carolina (wildflower): Goldenrod
Delaware (herb): Goldenrod
Kansas: Sunflower
Maryland: Black-eyed Susan
Florida (wildflower): Coreopsis
Mississippi (wildflower): Coreopsis
The indiscriminate
pollination strategy represented by all these flowers has advantages and also
disadvantages. They suffer no shortage of pollinators. If one species is doing
poorly one year, as it often happens in the insect world, there are plenty more
to fill in the deficiency. However, sometimes too much of a good thing can be
bad. Some of these non-specialized pollinators may be visiting a variety of
flowers instead of being faithful to just one species so they end up carrying
the wrong kind of pollen in such cases.
Blossoms
with such mass appeal give me the opportunity to introduce the reader to the
main groups of pollinators. They are all well represented on these mass appeal
flowers.
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Andrenidae bee © Beatriz Moisset |
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Bumble bee. © Beatriz Moisset |
Let us
start by getting acquainted with bees. More than 80 species have been seen on goldenrods.
Some of them deserve mention. Bumble bees are larger than other bees, plump,
dark with yellow or white stripes, and hairy. Metallic green bees are small and
gorgeously colored. They may escape notice if one isn’t very observant; but it
is easy to become captivated by their shiny aspect. Mason bees and leaf-cutting
bees carry pollen on their underbelly, unlike most other bees that carry it on
their hind legs. Most of them are dark, nearly black and about the size of
honey bees or slightly smaller.
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Wasp. © Beatriz Moisset |
Wasps
are related to bees and sometimes people confuse them. Most wasps are less
hairy than bees and have narrow waists. They raise their young on a diet of insects
or spiders, instead of pollen and nectar as bees do. Adult wasps need nectar to
fuel their flight. Thus, they are frequent flower visitors and accomplish some
pollination.
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Syrphid fly. © Beatriz Moisset |
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Syrphid fly. © Beatriz Moisset |
Many
types of flies, including mosquitoes and gnats visit flowers to feed on their
nectar. Some are good pollinators. The Syrphid flies, also called flower flies,
are among the most assiduous flower visitors. Most of them mimic bees or wasps
and are frequently mistaken for them. However, they don’t sting and there is no
reason to fear them.
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Buckeye butterfly on goldenrod. © Beatriz Moisset |
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Pyrausta moth on sunflower. © Beatriz Moisset |
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Yellow collared scape moth on goldenrod. © Beatriz Moisset |
Butterflies,
skippers and moths have extremely long tongues that they can use like drinking
straws when sipping nectar. They favor long necked flowers and carry pollen
from one to another.
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Polished lady beetle on sunflower. © Beatriz Moisset |
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Soldier beetle on goldenrod. © Beatriz Moisset |
Finally,
beetles, although not well specialized for pollination, are also capable of
doing so in special circumstances. We already mentioned magnolia pollination by
beetles. They also visit other flowers and can do a reasonably good job in some
cases.
In the following
chapters we’ll see flowers that have chosen a different strategy. They are
pickier or more selective. Some attract a handful of visitors; a few go to the
extreme of having relationships with only one species of pollinators.
References