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Trilliums And Ants have A Mutual Understanding
Today I spent considerable time outdoors on my knees. It
would have been especially satisfying if a few of those hours
could have gone toward planting garden seeds, but it is still too
cold and wet here to do that. Past experience has taught us that
the seeds of sugar snap peas, for example, simply rot in the
ground if they don’t have the proper heat to germinate.
Working to eradicate a patch of very aggressive plants, the
Japanese knotweed (Polygonum cuspidatum), from one of the state’s
natural areas also kept me pretty close to the ground for a part
of the day. Following that I marveled at the richness of
blossoms in our woods, large-flowering trilliums like you
wouldn’t believe.
With digital camera in hand I inched my way along the edge of
what I call my "Mother’s Day Trillium Hill" east of our
house. When you slow down your pace and get really close to the
ground it’s incredible the number of wildflower leaves you’ll
encounter.
Some day I think I’ll carefully mark out a plot, at least ten
feet by ten feet, along that special slope and study it
intensively for several consecutive years. Outwardly the
vegetation at this season is largely composed of the showy
large-flowered or giant trillium, Trillium grandiflorum,
but plenty of other wildflowers grow along with these spectacular
members of the lily family.
With careful observation you should find, for example,
Solomon’s plume, Canada Mayflower, both the northern and southern
species of spring beauties, bellwort, trout lily, blue cohosh,
Dutchman’s breeches, squirrel corn, wild leek, sweet cicely,
several species of violets, hepatica, rosy twisted stalk, and a
few others.
Once you begin scrutinizing a small patch of the woodland
floor you realize that many of the small single leaves are very
young trillium plants, no more than a quarter inch wide and an
inch or so long. You’re also going to locate many tiny
three-leaved trillium plants no taller than a few inches that are
naturally much too small to have blossoms.
Occasionally you come upon a very robust flowering trillium,
often two separate plants emanating from one point on the ground,
that are literally surrounded by a few dozen tiny
"baby" trillium plants. Here might be a case whereby
the ants either missed gathering the seeds from these plants or
at least didn’t gather all of them. Or the large number of small
plants may represent the site of one of the ants’ refuse piles.
Researchers in the past have come to the conclusion that ants
are especially fond of a part of the trillium seed called the
elaiosome (e-LIE-o-soam) or strophiole (STRO-fee-oal). Around
one-half of what constitutes one seed consists of this material
that is a readily-digested fatty substance (for the ants) that
they actually appear to crave.
The seeds are taken below the ground into the ants’ chambers
where the elaiosome is eaten and the remainder of the seed,
containing the embryo, is discarded. Eventually these perfectly
viable seeds are gathered, along with ant feces, dead ants and
other natural debris from the colony, and deposited on the ants’
so-called "compost pile," which, when chemically
tested, is considerably like 10-10-10 fertilizer that so many
gardeners use today.
The claim has been made that these seeds, so deposited,
germinate better and more reliably than those seeds that simply
drop to the ground next to the parent plant. In fact it is
thought that some wildflower seeds germinate only on the refuse
piles of the ants that initially consumed the sought-after
strophiole.
Frederick Case and his wife, Roberta, who wrote and
illustrated the outstanding book, "Trilliums," did much
research with many species of trilliums in their wild gardens
near Saginaw, Michigan. Pollination, germination, fruit, seeds,
flower structure, diseases, mutations and abnormalities are only
some of the topics discussed and shown in beautiful colored
photographs.
Their findings reveal without question that picking a wild
trillium does not kill the plant but will set it back so that it
may not produce another blossom for a year or two. The mature
plant’s rhizome, "a modified, creeping stem, usually
horizontal and underground," helps the plant survive to
bloom again some day.
Even though for several years toward the end of my Mother’s
life we presented her with a huge bouquet of trilliums picked in
our woods, we enjoy them today where they grow – and leave them
so.
The Cases wrote, "With continued population growth and
all its demands upon the land, we can expect that wildflower
populations of all types will be increasingly stressed and
damaged. We ought to set about now, before they become
endangered, to protect our native plant treasures for the
future."
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