Native Evergreens

I thought I’d start this post about evergreens with something you probably don’t associate with the word, but in fact we do have a few ferns that stay green all winter and are considered evergreen. Some more common ones are the Eastern wood fern (Dryopteris marginalis), Intermediate wood fern (Dryopteris intermedia), Christmas fern (Polystichum acrostichoides), Polypody fern (Polypodium virginianum) and a few others. As this post will show, if you are willing to look closely you’ll find that there is quite a lot of green still out there in winter.

Clubmosses are one of our most noticeable evergreens in winter once it snows, but they aren’t mosses at all. They are vascular plants that don’t flower; they produce spores instead of seeds and are considered fern allies. Fossils have been found that show the lowly clubmosses once grew to 100 feet tall. But that was a very long time ago; the tree clubmoss (Lycopodium dendroideum) in the above photo is barely 3 inches high. It shows the upright yellow spore bearing strobili, sometimes called candles or clubs that give the plants their common names. The plant is also called ground-pine because of its resemblance to the pine tree. Clubmoss spores have been collected and dried to make flash powder for many years. They are high in fat content and when mixed with air become highly flammable. They’ve been used in fireworks and explosives for years, and also as camera flashes before flash bulbs were invented. These days they are still used in magic acts and chemistry classes. They also repel water, so if dip your finger in a glass of water that has spores floating on it, your finger will come out dry.

Fan shaped clubmoss (Diphasiastrum digitatum.) was once used as a Christmas decoration (and still is in some places.)  These forest floor evergreens were collected by the many thousands to make Christmas wreaths and they are still rarely seen here because of it. Clubmosses aren’t mosses at all but do produce spores and are called “fern allies,” which are vascular plants that don’t produce seeds. I think fan shaped clubmoss is the most elegant of any of the clubmosses and I’m always happy to see it, especially in winter. A single plant can take 20 years or more to grow from spore to maturity, so they should never be disturbed.

Something that is always a surprise to see in the woods here is a northern white cedar (Thuja occidentalis.) I don’t know if it was a garden escapee or not but they don’t grow naturally here that I know of. The Native American Ojibwe tribe thought the trees were sacred because of their many uses. They showed 16th century French explorer Jacques Cartier how to cure scurvy with its leaves and he was so impressed that he named it Arborvitae, which is Latin for Tree of Life. He had trees with him when he returned to Europe, and that’s how Thuja occidentalis became the first North American tree to be introduced there.

Canada yew (Taxus canadensis) is native from Newfoundland west to Manitoba, south to Virginia, Tennessee, Illinois, and Iowa, but in this region I rarely see it. This plant was a small seedling barely 6 inches tall. Though all parts of the yew plant are poisonous several Native American tribes made tea from the needles to ease everything from numbness to scurvy.

New goldthread (Coptis groenlandicum) leaves are a bright, glossy lime green but darken as they age and by winter will often be very dark green. They’ll hold their color under the snow all winter and look similar to wild strawberries until late April or early May when new leaves and small white flowers will appear. Goldthread gets its common name from its thread like, bright yellow roots. Native Americans used goldthread medicinally and told the early settlers of its value in treating canker sores, which led to its also being nearly collected into oblivion like trailing arbutus and others. At one time more goldthread was sold in Boston than any other native plant. It has made a good comeback now and I see lots of it.

Usually when I do an evergreen post in winter I don’t show the flowers but that leaves me feeling like I’ve cheated you, so this time I’ll show you the flowers. All the flower photos were taken previously, of course. I like the tiny styles curved like long necked birds and the even smaller white tipped stamens on a goldthread blossom. The white, petal like sepals last only a short time and will fall off, leaving the tiny golden yellow club like petals behind. The ends of the petals are cup shaped and hold nectar, but it must be a very small insect that sips from that cup. 

Trailing arbutus (Epigaea repens) is also called mayflower because that’s often when its small white to pink, very fragrant flowers appear.  Its oval evergreen leaves are tough and leathery and hug the ground but though it looks like a groundcover botanically speaking it has a persistent woody stem, so it is classified as a shrub. This plant was once collected into near oblivion but these days it can be found at many nurseries so there is no longer any reason to dig it up. Since it’s very fussy unless it’s given the right amount of light, water, nutrients and soil type it won’t grow except where it chooses to anyway. That’s true of many of these native evergreens, in fact.

The reason trailing arbutus was collected so much was because of its small pink to white, very fragrant flowers. My grandmother loved this plant and she always wanted to show it to me but we could never find it back then. I see it now here and there.

Swamp dewberry (Rubus hispidus) is a trailing plant with fruit like a black raspberry and its stems are every bit as prickly. It also looks a lot like a strawberry when it’s in bloom and because of its strawberry like leaves, which stay green under the snow all winter. This is a plant that can trip you up when hidden by snow.

Swamp dewberry’s flower is quite pretty but its fruit is said to be sour and that is the reason it isn’t cultivated. Native Americans had many medicinal uses for this plant, including treating coughs, fever and consumption. Swamp dewberry, as its name implies, is a good indicator of a wetland or moist soil that doesn’t dry out.

Pipsissewa (Chimaphila umbellata) grows in large colonies and is easy to find because of its shiny green leaves that shine winter and summer and last up to 4 years. Like other wintergreens it likes dry, sandy, undisturbed soil in pine forests. Pipsissewa was once used as a flavoring in candy and soft drinks, including root beer. Its name is fun to say. It’s a Native American Cree word meaning “It-breaks-into-small-pieces.” This is because it was used as a treatment for kidney stones and was thought to break them into pieces.

I think I actually gasped the first time I found this large colony of pipsissewa in bloom. I remember kneeling there admiring the rare and beautiful sight for quite some time. It is things like this that keep me wandering through the woods, never knowing what I might stumble across.

Pipsissewa flowers often show a blush of pink. Five petals and ten chubby anthers surrounding a plump center pistil make it prettier than most of our other native wintergreens. Pipsissewa and some other native wintergreens form a symbiotic relationship with the mycelium of certain fungi in the soil and are partially parasitic on them through a process called myco-heterotrophy. This means that, even though they photosynthesize, they supplement their diet with nutrients taken from fungi. That explains why they will only grow in certain places, much like native orchids.

The pretty little seedpods of pipsissewa persist through the winter and poke up out of the snow. They are woody and split open into 5 parts to release the tiny seeds. Each capsule is about a quarter inch across. They remind me of the seedpods of the Indian pipe (Monotropa uniflora,) in some ways.

Shinleaf (Pyrola elliptica,) another of our native wintergreens, gets its common name from the way Native Americans used it as a poultice to heal wounds; especially shin wounds, apparently. Like several other wintergreens it contains compounds similar to those in aspirin and a tea made from it was used for many of the same ailments.

Shinleaf’s nodding white, waxy flowers are fragrant and usually appear near the end of June or into July. I find them in sandy soiled forests under pines.

American wintergreen is probably the easiest of all the forest floor evergreens to identify because it is so common. It is also called teaberry, and that name comes from a pleasing tea that can be made from the leaves. The leaves contain compounds similar to those found in aspirin though, so anyone allergic to aspirin should leave them alone. Though it looks like a groundcover botanically speaking it has a persistent woody stem, so it is classified as a shrub. 

American wintergreen’s blossoms look a lot like tiny blueberry blossoms.

Squirrels, chipmunks, mice, grouse, partridges, bobwhites, turkeys, fox, deer and bears eat the berries. If you’re really lucky you might get to eat a small handful before the critters find them. They were one of the first wild fruits I ever ate and I still remember what they taste like; Clark’s Teaberry Gum.

Striped wintergreen (Chimaphila maculata) loses its chlorophyll and turns deep purple in winter but as of this photo it hadn’t happened to this plant yet. This plant is relatively rare here and though I’m finding small numbers most of them flower but don’t set seed.  The Chimaphila part of the scientific name is from the Greek cheima (winter) and philein (to love,) so it loves winter and does not die from the cold.

The flowers of striped wintergreen stand out and help me locate the well camouflaged plants, so I begin looking for them in mid-July just as shinleaf is ending its bloom period.

The flower of striped wintergreen has 5 petals that are swept back, as if it had seen a strong wind. It also has 10 anthers but its style is very blunt. I’m hoping the small fly on the blossom was pollinating this plant.

Leatherleaf is a knee high shrub that gets its common name from its tough, leathery leaves, which are lighter and scaly on their undersides and turn purple in the winter. Florists use sprays of leatherleaf leaves as filler in bouquets. 

At a glance you might mistake leatherleaf  for a blueberry but this plant will grow in standing water and blooms earlier. Native Americans used the plant medicinally to treat fevers, headaches and inflammation but it is said that the leaves contain a toxin called andromedotoxin which is released when they’re heated so they’re probably best left alone.

Well, if nothing else I hope this post has expanded your idea of what an evergreen is. Though many of us think of trees like the young spruce in the above photo when we hear the word evergreen the list of plants that can be called evergreen is quite long and involves many species. We even have evergreen orchids.

It is only in winter that the pine and cypress are known to be evergreens. ~Confucius

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Melting

Last Saturday it rained and Sunday the forecast was for 40 mile per hour wind gusts, so I decided to stay out of the woods and play instead along the banks of the Ashuelot river. I’ve seen a lot of blown down trees this year and it doesn’t take much to bring them down when the ground is saturated. And saturated it must be because all the snow has melted and the river is approaching bank-full.

Downstream from the bridge I stood on it was choppy.

I stopped trying to get a good wave photo in the dim light and admired an aster seed head instead.

The remnants of a bird’s nest hung from the branches of a small oak. I was surprised at the length of the fibers it was woven with. They must have been nearly a foot long. I saw an eastern phoebe nesting here in the past but I can’t say it that was a phoebe that built this nest.

Instead of being caused by an insect like many galls, alder (Alnus incana) tongue gall is caused by a fungus (Taphrina alni). The fungus chemically deforms parts of the ovarian tissue of the female cone-like catkins (strobiles) and causes long, tongue shaped galls known as languets to grow from them. These galls seem to like high humidity so are usually found on alders that grow near swamps, ponds, rivers and streams.  

Birds are gobbling the berries of the invasive burning bush (Euonymus alatus) which isn’t a good thing, because this shrub doesn’t need any help in its mission to take over the understory. Since its introduction from Asia as an ornamental in 1860, Winged euonymus has spread as far south as the gulf coast, north into Canada, and as far west as Illinois. It creates such a dense shade nothing else can get a start, so our native plants won’t grow near it. Because of that burning bushes can create monocultures of hundreds or even thousands of plants, and that is what has happened along this stretch of river.

One of the curious things I saw on this walk was what I think was a hemispherical insect egg case attached to a tree.  It had a single hole in it where either the insect had escaped or a bird had pecked the larva out of it. It was hollow and had opened somehow and fallen away from the tree, and I could see that the inside was pure white.

I carefully closed the egg case (?) against the tree and this is what it looked like. The white spot is the hole in it showing the white inside. It was only about a half inch across and I don’t know what made it.

It was a mostly cloudy day but the sun was kind enough to come out long enough to illuminate a beautiful patch of snowy moss that was in front of me.

There is a trail here that follows a narrow spit of land that juts out into the river. I suppose you’d call it a peninsula. It’s wooded and though I told myself I had to stay out of the woods I couldn’t resist.

A little spruce tree reminded me that Christmas is near. It’s unusual to find a spruce growing here.

Barberry berries looked like tiny Christmas ornaments but barberry is extremely invasive so I’d rather not see it here. Japanese barberry (Berberis thunbergii) is native to Japan. In 1875 seeds imported from Russia were planted at the Arnold Arboretum in Boston, Massachusetts. Birds helped it escape and now it has become a very invasive shrub that forms dense thickets and chokes out native plants. According to the Michigan Department of Natural Resources, recently “barberry has been implicated in the spread of Lyme disease. Researchers have noted higher densities of adult deer ticks and white-footed deer mice under barberry than under native shrubs. Deer mice, the larval host, have higher levels of larval tick infestation and more of the adult ticks are infected with Lyme disease. When barberry is controlled, fewer mice and ticks are present and infection rates drop.”

Japanese barberry has inner bark that is bright yellow. It also has thorns that are a son of a gun to kneel on.

This is the first gall I’ve ever seen on a silky dogwood shrub. I haven’t been able to identify the insect that made it but it doesn’t matter because galls don’t usually harm the plants they grow on.

There are many witch hazels (Hamamelis virginiana) on the peninsula and I like to come out here in winter to see their beautiful brown leaves.

Beavers like witch hazels too, and treat them as we would a garden vegetable. Over the years, due to the cropping by the beavers, I’ve seen the witch hazels here grow into many stemmed shrubs. The beavers come and harvest a few; never all of them, and then leave them alone for a few years to grow back. Then they repeat the process, all up and down the river. It’s so good to have beavers here, because when I was a boy this river was so polluted few animals frequented it. Muskrats, I think were the largest animal using the river then. I can’t remember ever seeing a single sign of beavers.

Witch hazel seed pods explode with force and can throw the seeds as far as 30 feet. I’ve read that you can hear them pop when they open and even though I keep trying to be there at the right time to see and hear it happening, I never have been.

Bark beetles usually attack weak or dying trees but they can also kill healthy trees by girdling them.  Adults bore small holes in the bark and lay eggs in a cavity. Once the larvae emerge from the eggs they make tunnels in the inner bark. Once they stop feeding they will pupate at the end of these tunnels. The pupae then become young adults and fly off to find another tree. These beetles carry spores of various fungi which can grow on the outer sapwood and stop the upward flow of water to the crown. Bark Beetles include over 100 species. It is said that their work is like a fingerprint for the species. They can create such beautiful patterns in wood that it looks as if a calligrapher has taken up a chisel instead of a pen. When I think of things like this, created under the bark of a limb and never meant for me to see, that’s when I feel an almost overwhelming sense of gratitude, just for being alive and able to see beauty like this every day.

Bark beetles excavate egg galleries in fresh phloem, the inner bark which carries food from leaves to the roots of a tree. For a living tree this is a death sentence.  

The peninsula I was on gets narrower and narrower until it becomes just a point jutting out into the river, but on this day the water was so high I knew I’d never reach the end.

In fact the end of the peninsula was under water and this was a scary scene that I’ve never seen before. I’m guessing the peninsula is going to be a hundred or so yards shorter from now on.

On my way back up the trail I tripped over a pine branch and fell to my knees right on some Japanese barberry thorns. Once I stopped cursing my bad luck I saw that in fact I’d had good luck, because I saw a little pink, brain like jelly fungus that I’ve never seen before growing on the branch I had tripped over. Now I just have to see if I can identify it. So far I haven’t had much luck doing so. It’s very unusual, and cute too. It was a little over a quarter inch long.

There is no music like a little river’s . . . It takes the mind out-of-doors . . . and . . . it quiets a man down like saying his prayers. ~Robert Louis Stevenson

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Native Evergreens

I’d be willing to bet that when most of us here in New England (and maybe the whole country)  hear the word evergreen we think of a pyramidal tree with needles that stays green all winter, but as I hope this post shows there is much more to the evergreen story than that.

Striped wintergreen (Chimaphila maculata) loses its chlorophyll and turns deep purple in winter. This plant is relatively rare here and though I’m finding small numbers more and more most of them flower but don’t set seed.  I was happy to see this one had a seed pod on it. The Chimaphila part of the scientific name is from the Greek cheima (winter) and philein (to love,) so it loves winter and does not die from the cold.

American wintergreen (Gaultheria procumbens,) is also called teaberry or checkerberry and it is the first wild plant that I learned to identify, with the help of my grandmother. We used to love to eat the bright red minty tasting berries. It’s probably the easiest of all wintergreens to identify because of the strong, minty scent that comes from its crushed leaves. If you have ever tasted teaberry gum then you know exactly what it smells and tastes like. The plant contains compounds that are very similar to those found in aspirin so it’s not good to eat a lot of it, but a taste of the berries shouldn’t hurt. Its leaves often turn purple as the nights get colder, as the plant in the rear shows.

Foam flower (Tiarella cordifolia) has hairy leaves that look delicate, but they’re fairly tough and stay green under the leaves and snow all winter. The purple veins in each leaf become more pronounced as the nights cool and sometimes the leaves will have purplish bronze splotches. This plant makes an excellent flowering groundcover for a damp, shady spot in the garden. Plant breeders have developed many interesting hybrids but I like the native best, I think.

Partridgeberry (Mitchella repens) is another native that makes a good garden groundcover. Small, heart shaped leaves on creeping stems grow at ground level and you can mow right over it. In spring it has white trumpet shaped flowers that grow in pairs and in the fall it has bright red berries which are edible but close to tasteless. I leave them for the turkeys, which seem to love them. My favorite parts of this plant are the greenish yellow leaf veins on leaves that look as if they were cut from hammered metal. I have several large patches of it growing in my yard.

Trailing arbutus (Epigaea repens) is also called mayflower because that’s often when its small white to pink, very fragrant flowers appear.  Its oval evergreen leaves are tough and leathery and hug the ground but though it looks like a groundcover botanically speaking it has a persistent woody stem, so it is classified as a shrub. This was one of my grandmother’s favorite plants and she would walk in the woods to find and smell it rather than dig it up to plant in her yard.  It’s too bad everybody didn’t do the same because this plant was once collected into near oblivion. These days it can be found at many nurseries so there is no longer any reason to dig it up. Since it’s very fussy unless it’s given the right amount of light, water, nutrients and soil type it won’t grow except where it chooses to anyway. That’s true of most of these plants, in fact.

New goldthread (Coptis groenlandicum) leaves are a bright, glossy lime green but darken as they age and by winter will often be very dark green. They’ll hold their color under the snow all winter and look similar to wild strawberries until late April or early May when new leaves and small white flowers will appear. Goldthread gets its common name from its thread like, bright yellow roots. Native Americans used goldthread medicinally and told the early settlers of its value in treating canker sores, which led to its also being nearly collected into oblivion like trailing arbutus and others. At one time more goldthread was sold in Boston than any other native plant, probably by its other common name: canker root. Luckily it has made a good comeback and I see lots of it.

Swamp dewberry (Rubus hispidus) is a trailing plant with fruit like a black raspberry and its stems are every bit as prickly. It also looks a lot like a strawberry when it’s in bloom and because of its strawberry like leaves, which stay green under the snow all winter. This is a plant that can trip you up when hidden by snow.

Intermediate wood fern (Dryopteris intermedia) is also called evergreen wood fern. It is said to be the only fully evergreen fern with a lacy appearance but it cross breeds with so many other ferns in the Dryopteris  genus that I’m not sure how an amateur botanist like myself would ever know for certain what he was looking at.  But it isn’t always the name that’s so important. Just the fact that you can walk through the forest in January and see some green is often enough.

Unlike the spore producing sori on the marginal wood fern (Dryopteris marginalis) which appear on the leaf margins the sori on evergreen woods ferns appear between the midrib and the margins. In this photo this frond looks very much like the spinulose wood fern (Dryopteris carthusiana,) which it cross breeds with. It also crosses with marginal wood fern.

Evergreen Christmas fern (Polystichum acrostichoides) has deep green, tough leathery leaves that usually lie flat on the ground after a hard frost. They stay that way under the snow until spring when they will finally turn yellow and then brown to make way for new fronds. Christmas fern is so common that it’s hard to walk in these woods without seeing it. It’s also very easy to identify.

What makes an evergreen Christmas fern so easy to identify are its leaflets (Pinna) which some say look like little Christmas stockings. You can see why if you look at the part of leaflets near the stem in the photo. Each leaflet has a little bump or “ear.” This is the toe of the Christmas stocking and this is the only fern in the New Hampshire woods with this feature. One story says that the name “Christmas fern” is thought to come from the early settler’s habit of using its fronds as Christmas decorations.

Fan shaped clubmoss (Diphasiastrum digitatum.) was also once used as a Christmas decoration (and still is in some places.)  These forest floor evergreens were collected by the many thousands to make Christmas wreaths and they are still rarely seen here because of it. Clubmosses aren’t mosses at all but do produce spores and are called “fern allies,” which are vascular plants that don’t produce seeds. I think fan shaped clubmoss is the most elegant of any of the clubmosses and I’m always happy to see it, especially in winter.

Not all evergreens look alike and some, like the downy rattlesnake plantain orchid (Goodyera pubescens) pictured, don’t look evergreen at all. Orchids are often thought of as tender, fragile things but not our native orchids. It’s hard to tell from the photo but this plant is covered almost entirely by short, fine hairs. I watched it get covered by feet of snow last year and in the spring it looked just as good as it does in the photo. I think its leaves are every bit as beautiful as its small white flowers are.

It is thought that staying green through the winter lets evergreen plants begin photosynthesizing earlier in the spring and that gives them a head start over the competition. This post has just scratched the surface; there are many other evergreens out there and I hope now you’ll see more than conifers wearing green this winter.

The leaves fall, the wind blows, and the farm country slowly changes from the summer cottons into its winter wools. ~Henry Beston

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