Black Alder (Alnus glutinosa) in Michigan

Black Alder (Alnus glutinosa) is naturally found in Europe and North Africa. It is planted in Michigan as far north as Baraga Co. so it could spread throughout the state. Currently, it is recorded from the southern half of the Lower Peninsula.

Black Alder
Black Alder Left and Center Speckled Alder Right

Black Alder is a small tree with usually a single trunk. Its leaves are about as wide as they are long and have a notched tip. They remain green into December in southern Michigan. Dark gray to black bark with squarish plates identify this species. Leaf buds start out green and turn purple in the winter. It is difficult to distinguish this species by bud and twig characters. In the winter I use its growth habit and I look for leaves on the ground.

Speckled Alder

Speckled Alder (Alnus incana) is normally a multi-stemmed shrub. When it reaches tree size, its bark is tight and gray with large lenticels. Leaves are 1.5 to 2 times longer than wide with acute tips. Leaf buds are dark-reddish brown, and it takes some practice to separate this species from Black Alder using only the twigs. If this species is considered distinct from the European alder, then its scientific name is Alnus rugosa.

Black Alder Top Speckled Alder Bottom

Black Alder should be watched for throughout the state. It should be reported wherever you find it at the Midwest Invasive Species Network (MISIN). They also have a free app for reporting observations.

 
Copyright 2021 by Donald Drife

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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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