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Pinhook Bog is the only true bog in Indiana. Formed by glacial meltwater
on a clay bed, it is almost a totally sealed system. The plants that grow in
it are rooted in the mat of peat moss that floats on top of the water. The
water itself is extremely acidic, and thus the plants that grow here are
quite special. Pinhook Bog was designated a National Natural Landmark in 1965 and is
part of the Indiana Dunes National Lakeshore. I can't think of enough
good things to say about this place - I told everyone that I saw afterwards
what an amazing place it was. You have to go on one of the Naturalist
tours, as the bog itself is fenced in (being quite a sensitive area). They
have a morning and an afternoon tour most days, and you can get reservations.
I went up with Mom, Dad and Anna to check it out - here's some of what we saw.
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The National Landmark designation. Let me tell you, it truly deserves it.
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The bog is an unusual habitat, and the plants are really cool. This is
a Northern Pitcher Plant (Sarracenia purpurea, Sarraceniaceae).
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These plants are insectivorous - the bottom of the pitcher is filled with
a solution that breaks down and digests any insects who slide into it. The
edge of the pitcher is covered with fine hairs which all point down into
the pitcher. When an insect walks across the hairs, they tend to start
sliding down. An interesting note is that the only mosquito species in the
bog actually lays its eggs in the liquid in these pitchers... no idea how
they survive, but they do.
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Another plant that grows out of the peat mat here is the Pink Lady's Slipper
Orchid (Cypripedium acaule, Orchidaceae). Orchids are some of
the most complex plants in nature - with some very interesting characteristics.
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The pollen of the flower is inside the slipper - a bee will make its way inside, and then discover thet it can't get back out. The way the flower is shaped
ensures that the bee will spend the night inside the flower, getting totally
coated with pollen. By morning, the flower will have relaxed enough that the
bee can finally get out. But here's the catch - having gotten out, that bee
never wants to see another one of these flowers. Not the most useful
reproductive strategy, but it seems to work to some extent.
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(Apologies for the fuzzy picture!) If you've ever seen a photo of a Sundew,
the actual plant itself
is kind of surprising. This is a Spatulate-leaved Sundew (Drosera intermedia, Droseraceae). Another insectivorous plant, with sticky
hairs covering the spatulate leaves. The surprising thing about these is that
they're really, really small. I've never read the measurements given below
the pictures, and assumed they were maybe 6" across... they're actually more
like 2" across.
There is a reason why a true bog has a lot of insectivorous plants. It is
a closed system - meaning that it is very rare that any nutrients
will make their way in. Most animals don't come anywhere near here because
of the acidity (and of course the lack of any other animals), and the
plants that grow around the bog in less acidic areas tend to pull any run-off
nutrients out for themselves. Insects are one of the few sources of nutrition
for the plants here - they catch their own fertilizer as it were.
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In the bog, there are areas of open water where the peat doesn't cover the surface. This is one of the plants that grows there - the Bullhead Lily (Nuphar variegatum, Nymphaceae). The flower is almost closed, with just a
space around the center open.
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After Pinhook, we stopped at another nature preserve on the way back - it
was pretty neat, and had woods as well as medium-sized ponds. This is a
Dame's Rocket (Hesperis matronalis, Brassicaceae).
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Another characteristic of these family trips is that invariably someone will
see a flash of color on the side of the road, and we pull off to go take a
look. It's amazing the cool flowers you can find this way. This one is a
Rough-fruited cinquefoil (Potentilla recta, Rosaceae). Unlike
the usual Cinquefoil, this plant is upright and quite tall - these were 2-3'.
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Another roadside plant - a Black-eyed Susan (Rudbeckia hirta, Asteraceae).
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This is the Carolina, or Pasture rose (Rosa carolina, Rosaceae).
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