Native Orchids in Cranberry Glades Botanical Area

This past weekend my family and I made our now annual trip to the Cranberry Glades Botanical Area in West Virginia’s Monongahela National Forest.  I first heard about Cranberry Glades several years ago — from an orchid book by Stanley Bentley called Native Orchids of the Southern Appalachian Mountains and a blog I read called floraofohio.blogspot.com by Andrew Gibson — and we have gone every year since then.

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Cranberry Glades is a series of large, high elevation peat bogs at around 3400 feet, which contains many plants typically found in more northern regions.  Some of these plants are relicts of the last Ice Age, surviving only in this high montane valley and no where else in the Southern Appalachians.  Many species of native orchid can also be found  in and around the glades, including swamp pink, rose pogonia, large purple fringed orchid, ragged fringed orchid, and their hybrid, Keenan’s fringed orchid.

The air felt warm and fresh as we got out of the car, a noticeable difference from the mugginess of the lower elevations we had left behind.  We walked onto the half mile boardwalk that traverses part of Round and Flag Glades.  Near the parking lot, the canopy was closed with red spruce, eastern hemlock, yellow birch and black birch.  Thickets of speckled alder grew along the stream.  The ground was slightly swampy, covered in dense skunk cabbage and meadow rue growing above clumps of Sphagnum moss.  The canopy opened up around us as the boardwalk led out into the bog.  Dense tussocks of Sphagnum carpeted the ground, with both small and large cranberries growing out of them in clumps.  It was amazing to think of the many feet of dead Sphagnum and other plant materials below us — called peat— holding water like a gigantic sponge.  Bog-rosemary, one of the plants reaching the southernmost limit of its range at Cranberry Glades, grew along the edges of the boardwalk.  Small sprigs of a chokeberry species waved in the air a couple feet off the ground.  Soon the tiny, delicate pink flowers of grass pinks and rose pogonias began to appear amid the tangle of cranberry vines.

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Rose Pogonia (Pogonia ophioglossoides).  Unfortunately none of the pogonia plants were close enough to the boardwalk to photograph this year, so this is a photo of a plant I am growing at home.

We rounded a bend into a second glade, this one filled with clumps of giant cinnamon fern growing out of the Sphagnum.  Grass pinks bloomed beneath the ferns outstretched fronds.  As I was photographing a round leaved sundew, I heard a group of people come up behind us, eagerly searching for one of the insect-eating sundews.  They had clearly  heard about them but couldn’t find any.  I thought this was funny because sundews are all over the ground there, but they are so tiny that if you don’t bend down and look closely you can’t see them.   I pointed out sundews and the also carnivorous purple pitcher plants to the group and they were very grateful.

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Grass Pink (Calopogon tuberosus)

After lunch we decided to walk the cowpasture trail, which goes all the way around the glades through spruce woodlands and open, wet clearings.  In past years, we had found several species of orchids along it.

The wide, level cowpasture trail led into the woods from the road.  Magnolia and Canada warblers sang from the spruce, hemlock and rhododendron that lined the path.  I heard the slow, nasal call of a red-breasted nuthatch.  Not long after the start of the trail, the forest opened up into a large mountain meadow.  Meadowsweets and goldenrods grew thickly in the drier areas, while the wet seep in the center of the clearing was filled with rushes and sedges.  A pair of mating eastern red damsels perched briefly in front of me.

Back in the forest, mountain wood sorrel and various northern clubhouses appeared along the edges of the trail.  We arrived at a smaller clearing, and the wet ditch beside the trail exploded with vegetation.  Sorting carefully through the lush foliage, I was able to find the inconspicuous green flower stalk of a northern tubercled orchid.  It became apparent there were many more in this small ditch, the only place I have ever seen them.

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Northern Tubercled Orchid (Platanthera flava var. herbolia)

We continued hiking down the trail, listening to the songs of breeding birds that are rare in Virginia, such as hermit thrushes and several species of warblers.  I saw some of the wide, round leaves of pad-leaved orchid growing on a dirt bank under hemlocks, but unfortunately there were no flowers.  In another clearing I found one blooming ragged fringed orchid, along with one that had been eaten by a deer.

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Ragged Fringed Orchid (Platanthera lacera)

Some time later we emerged back onto the road.  As we were walking towards our car, a pick up truck pulled up and a man got out and began to inspect the road bank.  My mom, always on the look out for helpful local knowledge, asked him what he was looking for.  He showed us a patch of ragged fringed orchid further up the road that we probably would have missed.

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Ragged Fringed Orchid (Platanthera lacera)

He told us he’d met Stanley Bentley, the author of the book from which I learned about Cranberry Glades in the first place, and about the orchids that grew right in his back yard.   In the end, he gave us directions to his “secret spot” for a patch of about 40 large purple fringed orchids, although he warned us they were “a little spent.”  This information was especially exciting because I had searched for this species every time we came, but had never found it.

 

After a bit of a treasure hunt trying to follow his directions, we thought we found the spot and parked.  We climbed over a guard rail and down the slope into a marsh.  Sphagnum grew on the ground, and there were even a few cattails.  Stunted red spruce trees grew around the edges.  The first large purple fringed orchids we found were two old withered flower stalks, almost completely obscured by a bush.  I was getting worried as I walked towards the other end of the marsh.  Where were the orchids?  Luckily it turned out they were all clustered at the other end.  Many even still had very good looking flowers.

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Large Purple Fringed Orchid (Platanthera grandiflora)

 

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What a beautiful plant!

Flora Feature: Ragged Fringed Orchid

Center for Urban Habitats recently discovered two ragged fringed orchids (Platanthera lacera) on a survey of an acidic powerline prairie in eastern Albemarle.  We found the orchid in a powerline corridor holding a remarkably diverse prairie remnant, especially notable for having multiple plants not previously recorded in Albemarle County with coastal plain affiliations.  Such typically coastal plain plants include narrow-leaved sunflower (Helianthus angustifolius) and dog-fennel (Eupatorium capillifolium).

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Picture of the site

The goals for the June 19th survey included adding to the site’s flora list and looking for more regionally rare coastal plain disjuncts that could be growing in association with the sunflower.  The day’s survey team, Devin, Drew and I, spent the morning at the site, walking back and forth across the powerline every ten feet.  We found many species new for the location, including a couple of panic grasses previously reported only from the coastal plain.  We also stumbled across the ragged fringed orchid, growing in a sunny seep at the center of the powerline corridor.  We were particularly excited as we had predicted this species might be present there.

Ragged fringed orchid is considered globally secure, with a large range spanning most of the eastern United States and Canada.  Even so, this discovery has local significance, as there is only one other confirmed site for the species in the county.  This native orchid grows in wet, often acidic sunny areas, especially bogs, prairies and the edges of wooded wetlands.  It is in bloom from the middle of June in the Piedmont through late July high in the mountains.

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Ragged fringed orchid (Platanthera lacera)

Ragged fringed orchids range in size from a little less than half a foot to more than two feet tall, although most seem to be a bit more than one foot.  The stems are topped with a beautiful, loosely packed, cylindrical inflorescence of several to many flowers.  As is suggested by the specific Latin name, the orchid’s pale green lip is deeply divided into three heavily fringed or “lacerated” lobes.  The thin, pale green nectar spur that extends behind the flower ranges in length from 11 to 23 millimeters.

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Ragged fringed orchid (Platanthera lacera)

Although there are a few different species of orchid in Virginia with green flowers — small green wood orchid (P. clavellata), rein orchid (P. flava) and large round-leaved orchid (P. orbiculate) — only ragged fringed orchid has such a deeply divided and finely fringed lip, making it quite distinctive in the field.

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Ragged fringed orchid (Platanthera lacera)

Ragged fringed orchids are pollinated at dawn and dusk by several species of Sphinx and Noctuid moths, including celery looper and unspotted looper, as well as the commonly seen, day flying, hummingbird clearwing.

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Hummingbird clearwing (Hemaris thysbe), is a pollinator of ragged fringed orchid.