Springtime

Crocus

Crocus blooming in lawn in March

Spring is beginning to explode in Southeastern Michigan. I saw the first Woodchuck (Marmota monax) of the year in our yard. It is a healthy looking female. I watch her burrow entrance every spring. This morning it was filled with winter debris but is now cleaned out. A thousand crocus bloom in our front yard. However, there are no pollinators on this early nectar source. Turkey Vultures are heading north in their spiraling kettles.

I decide to visit Seven Ponds Nature Center to look for Skunk-cabbage (Symplocarpus foetidus). I hear Red-winged Blackbirds trilling when I pull into the parking lot. This is one of the best signs of spring. I can hear Sandhill Cranes calling, another first for the year. A small V of seven cranes flies over, heading toward the calling cranes. They fly with their necks out-stretched and they quickly upbeat their wings and slowly downbeat. I can see the red on the tops of their heads.

I charge down the trail, scarcely aware of my surroundings, heading to the boardwalk where I observed Skunk-cabbage last fall. I need to slowdown. I need to take in Nature. I need to decompress and enter fully into her world. I force myself not to hurry.

Symplocarpus foetidus

Skunk Cabbage flowering in standing water

Along the trail to the boardwalk I see Skunk-cabbage blooming. This Jack-in-the pulpit relative is one of the first plants to bloom. Its flowers consist of a center ball (spadex) which is a cluster of individual perfect flowers. It is surrounded by a spathe with an opening to allow pollinators to enter. The flowers are foul smelling and remind me of rotting meat. This smell attracts their main pollinators, flies.

Symplocarpus foetidus flowers

Skunk Cabbage flowers

As I lie on the trail photographing the plants I can hear buzzing insects. Honey Bees (Apis mellifera) are visiting the flowers. I have never observed Honey Bees on Skunk-cabbage before. I could not get close enough to see if the bees were gathering pollen or just visiting the flowers. I later check Frank Pellett’s book American Honey Plants. He quotes G[ilbert]. M. Doolittle who  states that he values Skunk-cabbage, “more highly than any other pollen-yielding plant or tree, and that there was nothing with which he was familiar so eagerly sought by the bees, nor any source of pollen which so greatly stimulated brood rearing.”

Symplocarpus foetidus

Variation in Skunk Cabbage spathe colors

The spathe color varies from dark maroon to a yellow-green with reddish speckles. I do not know if the color is related to the age of the plants or is simply a variation.  Farther along the trail I smell a few damaged plants. Their odor is unpleasant, reminding me of a skunk’s scent but without the faint sweet smell.

Alnus incana

Speckled Alder flowers developing

Speckled Alder (Alnus incana subsp. rugosa) is not quite in flower along the boardwalk. The yellow male catkins are expanding but not yet producing pollen. The small, red, female flowers are developing.

Castor canadensis

Beaver cut tree stump and lodge

Beavers (Castor canadensis) have a lodge along the shore of one of the lakes. This colony does not need a dam because the lake is naturally deep enough for their needs. They are cutting Speckled Alder for food. Branches from one of the Soft Maples, stripped of bark, are placed on the top of the lodge.

As I walk back to my car my pace is slow. When I surround myself in Nature I unwind.  I never know what I will see, even walking in a familiar area. I just get out and look. On this walk I have seen only familiar old friends that I know at a glance; however, it is still rewarding to renew these old friendships.

March 13, 2016
Copyright 2016 by Donald Drife

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Michigan Spring Wildflowers

Jack-in-the-pulpit (Arisaema triphyllum) is a common wildflower in Michigan, that blooms from early May into July. The largest plants are the latest to flower. The variability in the flower color, size, and blooming season produces in me a desire to recognize different species or subspecies in Michigan. It has been divided into species or subspecies south of Michigan by some botanists, but it does not seem possible to do so here. Environmental conditions or the ages of the plants cause many of the differences. Our largest plants, two-feet (.6m) high, grow at the edge of low areas in rich woods.

Arisaema triphyllum

Jack-in-the-pulpit male (L) female (R)

The plants are able to change sex from year to year. Young plants are male and typically have a single leaf. The female plants are larger and produce a pair of leaves. After a heavy seed set a plant sometimes reverts to male, then rebuilds its strength. When it is strong enough it will again become female.

Arisaema triphyllum

Jack-in-the-pulpit
Color forms

The flower, actually an inflorescence, consists of two parts, an outer spathe (the pulpit) and an inner spadix (the Jack). The spathe is a modified leaf. The spadix has a cluster of small flowers called florets.

Skunk-cabbage (Symplocarpus foetidus) is one of the first flowers to bloom in the spring. I often find it flowering through the snow. It also has an inflorescence consisting of a spathe and a spadix. It grows in wet areas sometimes along a stream or at the edge of a marsh or swamp forest.

It is more common in Michigan south of Bay City. However, in the north it commonly occurs on islands. I have seen it on Thunder Bay Island and several places on Isle Royale. It is local on the mainland in northern Michigan, meaning that it does not occur in every suitable habitat. I know of several colonies along the North Branch of the Au Sable River near Grayling Michigan. The genus consists of a single species that grows in eastern North America and in northeast Asia.

Symplocarpus foetidus

Skunk-cabbage

The flowers have a distinctive odor that has been described as combining “the smell of skunk, putrid meat, and garlic.” It is not a powerful smell and I only notice it when I’m down close to the plants. The smell attracts flies and beetles that pollinate the flowers. The leaves produce a similar but stronger odor when crushed.

Skunk-cabbage flowers produce heat by a complex chemical process. If you desire more information, see Seymour et al. Skunk-cabbage maintains its flower temperature between 59 and 72 degrees F (15 to 22 degrees C). It does this when the air temperature is below freezing. The flowers thermoregulate so they do not become too warm. This is similar to warm blooded animals. We are not certain why this happens. It might provide a favorable habitat for pollinators or the flowers might require that temperature for fertilization to happen.

Skunk-cabbage is flowering now. Get out and look around for this interesting plant.

Works Cited

Seymour,M., Bryce, G., Christie, A., & Narashima, T. (1997,March). “Plants that Warm Themselves.” Scientific American 276: 104-109.

Copyright 2013 by Donald Drife

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