Late summer orchids of Rondeau, all are species at risk!

 There are several highlights for botanizing later in the summer. Certainly the main highlight for me is to check on three orchid species that are found at Rondeau, all of which are quite rare in Ontario. One is so rare that its only Canadian location is at Rondeau. Another one is quite restricted, but so very small that the average person would not even see it. The third, and latest flowering one, is rare, but relatively widespread in the park and generally more visible.

 Keen botanists will likely already know the three I am talking about. The first, and rarest one, is the Nodding Pogonia (Triphora trianthophoros). 

Its peak time of flowering is typically the third week of August, although on rare occasions I have seen one or more in flower on even the last day of July. This year I went out into one of its best known locations on August 1, just to see what was happening, and was quite surprised to see several in flower. One even had a double flower!

The tricky thing with this orchid is its flowering strategy. All the buds develop to a certain stage, and then remain as is. It takes a fairly significant drop in the overnight temperature to trigger the buds to open on the morning of the second day following this temperature drop. All the buds that are ready will open, but just for a single day, and it may be a week before the next suitable temperature drop triggers the next set of buds to open.

The weather this August was anything but suitable for this flowering strategy. An overnight temperature would seem suitable, but then the next three nights would see the temperature drop even more! I think the plants were a little confused with this abnormal sequence, and as a result, their flowering was difficult to predict. On more than one occasion I went out expecting, or at least hoping, to see some in flower, but in some cases they flowered the day before and were not worth bothering to photograph. And the next set of buds were not well developed at all. This next photo shows what a single plant looks like, from a distance of about 6", with a 100m macro lens! They can be easily missed, even when one knows exactly what to look for, so I seldom go out unless I am quite sure they will be in flower, and if it is the wrong day, I don't spend much time looking so as to not accidentally step on them.

I do know where some are likely to be found, even if not flowering, and by being extra careful, I managed to find some that were tucked beside a fallen log, and almost impossible to see. This next photo is of a pair of even tinier plants with very undeveloped flower buds, and again, photographed with a 100mm macro lens from a close distance. The plants are merely 4-5 cm high. Even at that, I greatly cropped the photo to get this.

Overall it was one of the poorest years I can remember in my 50+ years of monitoring this endangered orchid. Probably the relatively dry weather at a critical time was partly the cause. However I did manage to get a few photos. These next two were taken in the 3rd week of August window. All were almost pure white, and while I always hope for some with a magenta tinge that I find even more attractive, the second photo is the only one that had even a very slight magenta tinge. Ones with a magenta tinge usually occur towards the end of the flowering season. Oh well, maybe next year.

 After blooming, the seed pods develop, as this next photo shows. Upon ripening, the seed pods will become erect, and start to dry, with the sides of the pod starting to split open so that a slight gust of wind will cause the seeds inside to disperse.

The second orchid I referred to, is about the same size as the previous one, and at least once the flowers open up, will remain open for several days. However for the more common variety of this one, Autumn Coralroot (Corallorhiza odontorhiza) which is also rare, the flowers don't open, but are self-pollinated! The rarer variety, known as Pringle's Coralroot and shown here, has flowers that do open. This first photo shows a group of four plants.

A closer look at the arrangement of flowers.

Closer....

And finally, a 'head-on' view of the lip of a single flower, which is probably only about 4 mm wide.

Not exactly a show piece for the horticultural industry, but an interesting orchid nonetheless, and it is native!

The third, and last orchid to be found flowering at Rondeau is the more common of these three. It is known as Great Plain's Ladies' Tresses (Spiranthes magnicamporum).

I found my first one with a few of the lower flowers starting to open up on September 13.

A couple of days later, there were a few more starting to open.

It is rare that all of the flowers are open at the same time, but sometimes most are. There are other species in the Spiranthes genus that look similar. A couple of the key characteristics of this one is that when in flower, it has a 'fragrance' that I think is similar to hot plastic. But without getting close enough to smell it, a close look shows a slightly yellow/tan colour well inside an open flower. None of the other Spiranthes have this coloration.

There is some slight hairiness to the outer white parts of the flower, and the sepals flare slightly back if viewed from the side.

 That's about it for Rondeau's orchids for this year. But by next May, another one of the 19 species of orchids will appear. Can't wait!

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St. Clair National Wildlife Area, one of the highlights of southwestern Ontario

 St. Clair National Wildlife Area (SCNWA) has always been a favourite place of mine to go. It is special in its own right due to the high quality wetlands, and even better it is quite close to home and so accessible!

Many of my previous posts include some of the things I find there along with things from other sites, but this one will focus only on this NWA. Being ~600 acres (~240 ha) in size provides lots of opportunities for wildlife, especially wetland birds. A further benefit is that there are other wetlands immediately north and southwest of it, to improve the overall wetland features for wildlife. 

The hiking trail that crosses the heart of the wetland is invaluable to appreciate what it has to offer. The presence of an observation tower enhances a visit. These first two photos were taken from the tower, and the first one shows the hiking trail leading to the tower.

The second photo gives an idea of the expanse of the marsh, with some open areas scattered throughout, making it ideal for many water birds.

One never knows what to expect, so being constantly on alert for anything flying by is essential. One of the highlights of a recent evening visit was to observe both an adult Bald Eagle and an Osprey, with the eagle harassing the Osprey. I watched them for several minutes, as at one point they were flying almost right overhead. The down side was that it was getting close to 8 p.m. so the light wasn't great and they were against a bland sky, but I rattled off a bunch of shots. Here are some of the more satisfying ones. It was hard to tell, but it appeared that the Osprey had something in its talons, and the eagle was trying to get it to let it go so it could pounce on whatever it had. I didn't see any success of this, and eventually the two birds separated and moved off.

 

 

On another occasion when I was out in the evening, I enjoyed an attractive sunset.

Sometimes one can see things like Sandhill Cranes passing by against the colourful sky.

Sunrise photography is also quite fun and rewarding. These next two were not taken recently, but a few years ago when I had a special interest in capturing sunrise shots from various points in Chatham-Kent.

 Aside from the landscape, er, waterscape photography, the main purpose for many visitors is to see the wonderful diversity of flora and fauna. Here are a few things from mostly recent visits, starting with butterflies.

Black Swallowtail

Clouded Sulphur 

The first two butterflies are to be expected. This next one is a Common Buckeye, and it is anything but common. This was the first one I had seen this season. A bit of a surprise was to see three of them, and they were vying for a spot to land. This one was the successful one, and I saw the same one (based on the wear and tear on the left forewing) in the same place two days later.

Monarchs, of course, were fairly abundant which wasn't surprising due to the plentiful milkweed on which to lay eggs when they weren't feeding on Missouri Ironweed.

Red Admiral

Viceroy

The flowers are more abundant in the later part the season, with lots of goldenrod and sunflower species lining the trail these days. One of the highlight species to see is this next one, the Marsh Tickseed, which is an endangered species, but fairly common along at the waters edge along both sides of the trail.

Another rarity, although not as rare as the previous one, is Missouri Ironweed.

 

Another rarity is Field Thistle, next.

 Not a rarity at all, and actually fairly common, is Evening Primrose.

 

Of course there are quite a few Leopard Frogs hopping along the trail.

 But birds are one of the main reasons people are visiting, and for good reason. The views and diversity are great, with some giving good photo opportunities, and others just views through binoculars as they scoot through the skies. Waterfowl are building in numbers, and once the hunting season starts, they will be increasingly abundant at the NWA as it is a safe haven for them. Here are a few waterbirds that I have recently encountered and photographed.

Great Blue Heron

Less frequently the herons will be up in a tree along the edge.

Great Egret

One of the highlights of a few years ago, when the water in the NWA was lower, was to photograph a large group of Great Egrets at their overnight roost. This photo was taken in late September just before sunrise. I had to use a very slow shutter speed, due to the very early morning light, but the birds remained motionless.

Waterfowl, especially Mallards will be quite abundant in the next few weeks.

Mallard

Okay, not a waterbird in one sense, but Northern Harriers frequently nest in wetlands, and are often hunting for something to feed on.

The first two photos were taken from the tower. And then the bird landed a short ways just off the trail, and allowed me to get this next photo.

Pied-billed Grebes are more often heard than seen.

Sandhill Cranes are often in the area, and will nest in or adjacent to the wetland. When feeding in the shallow water, they can sometimes be almost obscured by the tall wetland vegetation. This was taken from the tower.

 Wood Ducks are a favourite, and are one of the more common duck species present at the moment.

Young female Wood Ducks

 

So many photo opportunities to enjoy at this nationally significant natural area. Enjoy it when you can!

UPDATE: I have been informed that as of Oct 1, 2025, public access to the SCNWA is not available, as there is some upgrading to the trail system/bridge getting underway. Public access is restricted until Jan 1, 2026.

 

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