Chorus Frog Eggs

During the volunteer walk this week we stopped for a moment by the pond to search for amphibian eggs. Smallmouth Salamanders lay their eggs as early as February, if there is an early thaw - this year spring came rather late, so they didn't get to the ponds until the first few weeks of March. Western Chorus Frogs and Spring Peepers are early breeders as well - we've been hearing the comb-like trilling of the Chorus Frogs for several weeks now, and the Spring Peepers call mostly during the evening.



Tom N. took a photo of the Chorus Frog Eggs we found attached to a stick in the pond - thanks Tom! Amphibian and reptile eggs in Indiana are protected. It is illegal to remove them from their pond or nest, although after checking with IDNR we were told it was ok to look at them briefly, for educational purposes, as we are doing here.


Smallmouth Salamander Eggs would be similar, but not quite so many and a bit larger. The Chorus Frog eggs will hatch within a few days to a few weeks, depending on the temperatures (with 80 degree days predicted, the eggs will probably develop quickly!). The tiny tadpoles will spend about two months in the pond, feeding on pond scum and algae, before going through metamorphosis and leaving the pond as tiny froglets about the size of your thumbnail. The froglets and adult frogs will spend the rest of year living in the forest, rarely seen by humans, will hibernate under the leaves and in underground burrows made by other animals, to emerge again in the spring and head to the pond to start the cycle all over again!

Late Summer Wildflowers

We usually think of spring as the time for wildflowers, but a surprising number of flowers bloom throughout the summer. Some of my favorites appear towards the end of summer - I know that when the purple ironweed blooms, fall is not far away!



Queen Anne's Lace, Daucus carota, also known as wild carrot, is a familiar sight along roadsides and open fields. It was introduced from Europe and is considered an invasive weed in many areas, as it can outcompete native plants; however, the leaves do provide food for the caterpillars of the Black Swallowtail Butterfly. The large, carrot-like taproot is edible. Not surprising when you consider that the "wild carrot" is actually the ancestor of our modern cultivated carrots. Use extreme caution if you decide to take a nibble - Queen Anne's Lace closely resembles the deadly poisonous Water Hemlock! Both are members of the parsley family, Apiaceae, which also includes Fennel, Caraway, Anise-seed, Rattlesnake Master (an unusual prairie plant), and Celery.

The flowers of Queen Anne's Lace are compound --composed of many tiny flowers clustered together. They often have one or more dark purple-red flowerlets at the very center, drops of Queen Anne's blood where she pricked her finger while making lace, at least according to legend.

Ironweed, Vernonia altissima, one of my favorite "weeds" of late summer. They usually begin blooming in August in meadows and along roadsides, and their tall vibrant purple blooms are a favorite of bees and butterflies. Ironweed is a member of the aster family, Asteraceae.

Wild Forget-Me-Not, Myosotis sylvatica, is another exotic species, introduced from Europe and Asia. It prefers rich, waterside soils, and has been blooming all summer along the marshy inlet at the base of the amphitheater. Forget-Me-Nots are often used as a symbol of enduring love. In a rather sad legend about the origin of the name, a knight fell into a river while walking with his sweetheart, and tossed her this flower that he pulled from the river's edge, shouting "forget me not," before the weight of his armor pulled him under.

Virginia Spiderwort, Tradescantia virginiana, is a native perennial that blooms mid-spring through summer. It is a member of the Dayflower family - individual flowers often close up by afternoon on sunny days, and each flower only lasts a day or two. The camera didn't capture the color well here - flowers are actually a deeper blue-purple.

A close up of the flower reveals a possible source for the name "Spiderwort" - each anther is surrounded by several tiny filaments that might resemble a spider's web.

This is another member of the Spiderwort or Dayflower family that can be found growing in the park, the non-native Common Dayflower, Commelina communis. This one was found along the trail to the pond by the EDC, and with the two big petals reminded us of a little Mickey Mouse.
Virginia Knotweed, Polygonum virginianum, is common throughout the woods of Eagle Creek. When the seeds are ripe, they will explode away from the stem at the slightest touch, giving the plant its other common name of "Jumpseed."
By far the most noticeable late summer wildflower at Eagle Creek is White Snakeroot, Ageratina altissima. The clusters of white flowers create dense stands through much of the forest understory of the park. White Snakeroot contains the toxin tremetol and is poisonous when eaten, which probably explains its success in areas with high deer populations.
When European pioneers began settling the Midwest in the early 1800's, many of them became ill and even died from the mysterious "milk sickness." One of the most notable victims was the mother of Abraham Lincoln, Nancy Hanks Lincoln. It was not until the 1900's that the cause of milk sickness was officially determined: tremetol poisoning, from cattle that had grazed on white snakeroot plants (Although she never received official recognition, Dr. Anna Bixby probably discovered the cause several years earlier: http://en.wikipedia.org/wiki/Milk_sickness.) Normally, cattle avoid the bitter leaves, but if they were being kept in woodland areas with few other sources of forage, they would eat it if they had no other choice.

Hemlock and Spruce and Pine, oh my!

There are several coniferous tree species found in Eagle Creek Park; for instance, the long magestic row of tall Norway Spruce (Picea abies) trees with their graceful upward arching branches along the main road by the Ornithology Center. They were originally planted by the Lilly family, and there are several around the EDC as well. As the name suggests, Norway Spruce is native to Europe. There is a White Spruce, Picea glauca, which is native to Indiana, but I've not found any growing in the park.Spruce needles are very stiff, and quite sharp. Folks who celebrate Christmas with a live spruce tree usually have a few uncomfortable prickly moments setting them up!The cones of the Norway Spruce have densely packed scales, and are 6+ inches long (cones of White Spruce are much smaller - less than 3 inches). Squirrels like to strip them of their scales and eat the seeds, leaving the central stem of the cone behind.

If Norway Spruce has the biggest cones, the Eastern Hemlock (Tsuga canadensis) has the tiniest - these little doobers are only about an inch long.

Eastern Hemlock has flat, rounded needles, soft and flexible, rather than stiff and sharp, with two whitish lines on the underside. This is not the same hemlock that killed Socrates (the poison he drank was made from an herbaceous plant that looks a bit like parsley - Poison Hemlock, Conium maculatum) so don't worry about touching and handling Eastern Hemlock, it won't bite! In fact, pioneers often made tea from the needles, which, like most conifer needles, are high in vitamin C. Deer also find the Hemlock needles tasty; the trees in the park are all browsed as high as a white-tailed deer can reach.

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Eastern Hemlock prefers cool and humid growing conditions, and unlike most other conifers it can grow in the shade. Most of the trees in the park were probably planted, but they grow naturally in ravines in southern Indiana. These cool, humid microclimates became refuges for hemlock trees when the glaciers retreated long ago, and Indiana became too warm and dry for them to survive in more upland forest.

Next we have the cones of the Eastern White Pine (Pinus strobus) - similar in size to Norway Spruce, but the scales are much less densely packed, and they are often adorned with white bits of sap on the ends. White Pine is native to Indiana, but the original range was only in a few small pockets - the trees in the park were probably planted. Check out the "Native Trees of Indiana Riverwalk" for some excellent range maps of Indiana trees: http://www.phyplt.ipfw.edu/GROUNDS/NativeTreesOfIndianaRiverWalk/NativeTreeListByCommonName-Page1-Test.htm

White Pine holds the record of being the tallest tree in eastern North America; pre-colonial trees were reported to reach over 200 ft tall, and the current record holder is just over 180 ft. The tall, sturdy trunks of the White Pine were in great demand during colonial times to be turned into masts for the ships of the British Royal Navy.

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There is a large White Pine growing near the deck at the Ornithology Center, and one at the edge of the Grasshopper Field by the EDC.

Needles of the White Pine are long and slender, and grow in clusters of five. Quite conveniently, the word "white" has five letters, making this fact a little easier to remember. The needles look sharp, but they are actually quite soft and flexible.

The other common pine tree in the park is the Virginia Pine (Pinus virginiana). Its needles grow in clusters of two, and the needles are slightly twisted or spiraled. There are several stands of Virginia Pine planted in the park - you can find them growing along both the Pin Oak Loop and the Cabin Loop Trail by the EDC. Virginia Pine is native to Indiana, but only occurred naturally in the south, along the Ohio River.

Most of the Virginia Pine trees in the park look rather worse for wear. It is hard to even tell they are pines in most cases, unless you look to the very top and see the needles. Virginia Pine is shade intolerant, and has a very short lifespan - only 60 to 90 years - and that is about how long ago they were planted. Norway Spruce can live a little longer, 100-200 years, and White Pine and Hemlock can reach ages of 300 to 400+.

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The cones of Virginia Pine are medium in length, around 3 or 4 inches, and have a sharp thorny spur on the tip of each scale.

Ohio Buckeye

The first tree to leaf out in the park is the Ohio Buckeye, Aesculus glabra. Most of them are quite small - there are clusters of young trees at the end of the driveway coming out of the Ornithology Center, another patch just before the sharp curve at Fisherman's Cove, and near the end of the Cabin Loop trail by the EDC. I only know of one big tree in the park, although there are probably others scattered around.
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The European version of the Buckeye is known as the Horse Chestnut, Aesculus hippocastanum, and is sometimes planted as a landscape tree. Despite the name, this is not the chestnut of "roasting on an open fire" fame - the nuts produced by both of these trees are actually toxic to humans, although deer and a few other animals can eat them without harm. Edible chestnuts come from the American Chestnut, Castanea dentata, a member of the beech family, which sadly has disappeared from most of our forests due to an introduced fungal disease.
Although it may look like I'm holding five leaves here, in actuality there is only one compound leaf in the picture, a single leaf composed of five leaflets. Buckeye leaves are also palmate - shaped like a hand with all of the leaflets connecting at the center. Some compound leaves, like those of the walnut, are pinnate - shaped like a fern, with the leaflets along a central stem. The new leaves are dark red, but they'll turn green as they get larger.
Here's a photo of a Buckeye from earlier in the year, which shows how the buds/leaves are arranged in an opposite pattern on the twig, rather than alternate. Opposite leaf and bud arrangement is an important clue when it comes to tree ID, as there are only a few tree groups that have opposite leaves: Maple, Ash, Dogwood, Horse Chestnut, and Buckeye. MAD Horse Bucks is an easy way to remember the opposite-leaved tree groups. I've also seen MAD Cap Horse - the "Cap" stands for the family Caprifoliaceae, which includes shrubs like honeysuckle, viburnum, and elderberry, all opposite-leaved.

Wildflowers - the leafy preview!

Over the last week, the forest floor has become a carpet of wildflower leaves, poised to burst into bloom. Here's a preview of coming attractions!

Spring Beauty

Cut-leaf Toothwort
Deer Tongue / Trout Lily

Toad Trillium

Dutchman's Breeches

Mayapple

Mayapple unfurling

Like a patio umbrella

Hepatica

Similar to Bloodroot, Hepatica blooms early and briefly - you have to stay alert to catch it in the spring! On first glance Hepatica can look a little like Bloodroot, but the leaves are very different. These flowers were growing along the staircase up to the cabin. Sometimes the leaves are green, but along the staircase they were dark red - can you spot their three-lobed shapes among the dead tree leaves? The Hepatica was also blooming all along the bank overlooking the little creek in the ravine, at the bottom of the wooden staircase on the Cabin Loop Trail.

Hepatica can be white or lavender in color:

My favorite thing about Hepatica though? It's fuzzy! The stems and new buds are covered with white fuzzy hairs, probably as insulation from the cold temperatures of early spring.

Carrion Beetles - Gross Stuff Warning!

White-tailed Deer love to hang out right in front of the EDC. They seem to be shedding their winter coats - we found a few clumps of deer fur along the trail!A park volunteer brought me a partial deer skeleton that he found on the other side of the reservoir. Since it still had some meat and fur on it and is a bit smelly, I put it out alongside the trail for the scavengers and decomposers to finish cleaning. The skeleton has only been there a week and already it has been discovered by carrion beetles (family Silphidae), who were working away industriously at cleaning up the remaining dried up bits of flesh from the bones. Here's a video of some of the beetles working away. There appear to be two types of carrion beetle here - all black ones, and some with orange on their heads, almost like lightening bugs. I find them fascinating, but if the thought of beetles scuttling about and munching on a dead deer grosses you out, you may not want to watch this one. Just imagine how gross it would be if they DIDN'T eat the deer though - yuck!

A Winter's Butterfly

While walking along this Monday we were greeted by the sight of a dark-colored butterfly flitting through the forest - in March! Most butterflies and moths overwinter in the chrysalis or cocoon stage. A few, such as the black-and-orange woolly bear, hibernate as caterpillars, but the Mourning Cloak overwinters as an adult butterfly, and is thus the first to emerge in the spring. Occasionally folks who bring in firewood in the wintertime are surprised when a hibernating butterfly wakes up with the indoor warmth and starts flying around their house! Mourning Cloak adults feed on tree sap more than flower nectar, while the caterpillars feed on willow species. (The photo is from wikipedia - the butterfly we saw didn't hold still long enough for me to get a picture!)

Honeysuckle to Honey Locust

Ah, the first green leaves of spring...unfortunately, they belong to the invasive exotic, the bush honeysuckle. Bush honeysuckles are some of the most pervasive and difficult to eradicate invasive species in Indiana. They create dense shade that prevents native wildflowers and shrubs from growing; some species even release growth-inhibiting chemicals into the soil. The Indiana Native Plant and Wildflower Society (INPAWS) has a very informative flier that lists the ten most damaging invasive plant species in Indiana, including the bush honeysuckle and the Japanese honeysuckle vine:
http://www.inpaws.org/InvasivePlants.pdf
In addition to the early appearance of leaves, bush honeysuckle can be identified by the opposite branching pattern of the twigs and leaves (most of our native shrubs are alternate).
When walking through the forest sometimes you run across a tree with a strange lump, almost like a tumor. These woody outgrowths are known as burls (also known as burrs). No one is entirely certain what causes them, but it is believed that most are triggered when the tree undergoes some sort of stress - from certain types of mold or insect infestations, physical damage, and possibly genetic susceptibility. Some burls can grow quite large, and the wood is prized by artists and furniture makers for the unique and beautiful woodgrain patterns. The bark of the Cork Elm (Ulmus thomasii) is squishy, and indeed, very corklike! The bark grows in layers, typical of most elm bark. According to wikipedia, the Cork Elm is susceptible to Dutch Elm Disease, which may explain why we only seem to find a few small trees in the park.

If you're a tree hugger by nature, you might want to consider giving this tree a friendly, careful pat instead! These impressive thorny growths are found on the Honey Locust tree (Gleditsia triacanthos), making it a very easy tree to identify, even in the winter. The "honey" the tree is named for comes from the sweet pulp of the long bean pods the tree produces in fall, used for food and even fermented into beer by Native Americans. The pulp of the Black Locust tree bean pod is toxic, so be sure you have the right tree if you ever decide to taste it. Thornless varieties of the Honey Locust are often sold in plant nurseries for landscaping.

Semi-tame Wildflowers

Down the sides of the ravine between the EDC and the Peace Learning Center there are some not-so-wild wildflowers growing: the leaves of the familiar daffodil are poking up from the forest floor in good-sized clumps. Most of them were probably planted by the Lilly family (who built what is now the Peace Learning Center as a summer residence), and we have been told they are of an older variety not commonly seen today. Daffodils are are originally from Europe, Asia, and North Africa, and are not native to North America. Although they are an exotic species, daffodils are not considered to be an invasive species; they spread slowly, and do not outcompete the native wildflowers. Daffodils are also sometimes called jonquils or narcissus, and in the southern US they are sometimes referred to as buttercups, although "buttercup" can refer to several other species of flower as well.

Another non-native spring flower found in Eagle Creek Park, the bright electric-blue flowers of Scilla are easy to spot. The name is pronounced "Sill-uh," and it is also known as Siberian Squill. There seems to be quite a bit of variation in the common and even the scientific names - I've seen it called Scilia, Scilla siberica, and Scilla sibirica. Scilla is a member of the lily family, and, as the name suggests, came originally from Siberia. I wasn't able to find any information on whether they are considered invasive or not in Indiana, but I hope not - they're awfully cute! We found this one growing at the beginning of the Pin Oak trail in front of the EDC.

And yet another non-native early spring flower probably planted by the Lilly family: Snowdrops, also introduced from Europe. These hardy little white flowers are usually among the first flowers to bloom, sometimes even in February. They've spread to create large patches down the sides of the ravines just north of the Peace Learning Center.

Here's a close up of a snow drop bloom - when hanging down it is hard to see their beautiful green centers. This one had some tiny beetles living inside, and while I was watching, several bees and flies visited the other flowers to gather pollen and nectar.

The leaves of Virginia Bluebells were poking out of the ground near the same area as the Snowdrops. Some of them had a purplish cast, making them look like little cabbages. This one had some flower buds forming already - usually they don't bloom until later. Virginia Bluebell is actually a native wildflower to Indiana.

Monday Volunteer Walk March 9th Part 2

The leaves of the False Rue Anemone were poking out through the dead leaves on Monday - another sign of spring-to-come. Later they will create carpets of delicate white wildflowers. There is also a True Rue Anemone - not sure why this is considered to be the false one!


More early wildflower leaves peeking up through the forest floor - this three-lobed leaf is much thicker and sturdier than the fragile False Rue Anemone leaves and belongs to Hepatica. The leaf was thought to resemble the three lobes of the human liver, and thus, logically, the plant must be good for treating liver ailments! Hepatica is the Latin word for "liver," and another name for Hepatica is "Liver-leaf." This belief, that the appearance of a plant indicates its medicinal purpose, is known as the "Doctrine of Signatures."
We found the Hepatica growing along the stairs up the hillside leading to the old cabin. Not a pioneer cabin, although it is fun to pretend! This would be far too large and difficult to heat for a pioneer family. The cabin was built in the 1950's by the CEO of Indianapolis power and light (I still need to double-check the date, so don't quote me on that), and is constructed of old telephone poles!

Driving through the park in winter, it is easy to notice all of the young American Beech Trees (Fagus grandifolia) in the understory of the forest. Older beech trees drop their leaves in late fall, like most deciduous trees, but the younger beeches hang on to theirs for some reason. It is fun to hear the dry papery leaves rattle in the breeze, and they often are bent up in the direction of the prevailing winds by the end of winter. Young beech trees are able to grow in the shade, unlike the oaks and hickories, and so beeches, along with maples, are part of the mature Climax Forest of Indiana.

The long pointy leaf buds of the beech tree were formed last fall, and have been waiting patiently all winter for warm weather to come. They look quite dangerous and sharp, but don't worry - they're harmless (although I wouldn't recommend getting your eyes within poking range - look closely, but not TOO closely). You'll see a lot of my fingers in these close-up twig and bud shots - that was the only way to convince my camera to focus!

Another fun leaf bud - this one reminds me of a tiny fuzzy knife blade and is found at the tip of the Paw Paw, or Indiana Banana. I like to pet them - they are so silky soft! The round fuzzy bud further down the stem will open up in to a dark maroon, bell-shaped flower.

The strange and interesting twigs of the Winged Euonymus (Euonymus alatus), also known as burningbush for the bright red color of the leaves in the fall. The corky ridges are thought to be an adaptation to discourage browsing by deer.

Unfortunately, winged Euonymus (pronounced YOU-WAN-IH-MUS) is considered an exotic invasive species in our woodlands, brought over from northeastern Asia as an ornamental in the 1860's. When planted as a landscape plant away from forests it is usually not a problem, and there are several cultivated varieties that are less invasive and provide beautiful bright red fall color, but recent studies have shown that native trees and bushes are much more valuable to wildlife, especially birds, than the exotic species commonly used for landscaping. The key is in the BUGS!

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Native species are host to a whole community of caterpillars, beetles, and other invertebrates that are a vital source of FOOD for songbirds. Trees and bushes brought in from other parts of the world are missing the network of insects that have adapted to living with them in their home country. Although they provide some shelter, and some species may produce berries or nectar, their main value as an insect smorgasbord is missing.

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Planting native trees and bushes is a much better choice for wildlife. It is a gargantuan task, but we also attempt to control exotic invasive shrubs and bushes in our forests, so that native shrubs have a chance to grow. There are native varieties of Euonymus, although they don't have the nifty wings on the twigs. We'll have to see if we can find some growing this year.

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For some excellent reading on the value and importance of native plants to our declining bird populations, check out the book "Bringing Nature Home" by Douglas W. Tallamy:

http://bringingnaturehome.net/native-gardening