Milkweeds Mowed at Tusculum

An earlier post entitled Searching for Monarchs in Princeton mentioned spotting a monarch in a field packed with common milkweed over at Tusculum--the former estate of John Witherspoon on Cherry Hill Road. Here's what that field looked like a month ago.

And here's what that field looked like just a week or two later. Now, some of the fields at Tusculum are publicly owned, while others remain in private hands. This field is privately owned, and has for decades been managed for hay production. That's a big reason why it's still a field rather than a deeply shaded woodland where milkweed would have little chance to grow.

So the annual mowing can generally be thought of as beneficial, but the timing of it--while monarchs are still in our area, reproducing in preparation for their imminent migration back to Mexico-- is definitely not. I doubt that the current owners or the mowing crew had any idea that the field was important monarch habitat, and that waiting a couple weeks would have saved any monarchs maturing in the field.

It's another example of how important it is to communicate with those who own or manage habitat around town.  I've been told that the owners in this case will be contacted, with the hope of shifting the mowing regime next year to benefit the monarchs.

The publicly owned fields at Tusculum have not been mowed, as far as I know, though there as well ongoing communication is required, as is re-evaluation year to year in order to find the optimum timing and frequency for mowing.

When Lightning Makes Glass

Who burned this bench? Vandalism, maybe,

but what are these three holes next to the bench, that look like they're coated with candle wax?

And this little glass-like figure that resembles a snail?

I wouldn't have seen any of these curious sights if I hadn't started up a conversation about plants with a man walking the nature trail loop near the Harrison Street crossing of the canal. He said go to mile marker 10, between Washington Road and Alexander, and see what lightning did when it touched the ground.

Across from the mile marker was the charred park bench, a dead tree, and three holes in the ground.

And still littering the ground were pieces of glass, or more accurately, fulgurite, created by the intense heat delivered by the lightning as it struck the ground. Pieces of distorted metal cable also were lying on the ground.

The man who pointed me towards the scene, Mark Grinbaum, later looked back at some photos he had taken, dated July 4. Evidently, the strike took place the evening of July 2, when a violent storm came through town, stealing the show from the fireworks display that played to sparse crowds later that evening.

Princeton's New Neuroscience Building Has Thoughtful Native Plantings

Princeton University has been integrating raingardens into the landscaping around their new buildings. The chemistry building has two very large ones on the west side, and the recently opened Princeton Neuroscience Institute building has one that's fed by runoff from the road and densely planted with native species, such as the cardinal flower in the foreground.

The flowering of other species there is more subtle but attractively massed, and just possibly eye-catching enough to attract the momentary attention of car drivers passing by on their way to a university lacrosse or soccer game.

A curbcut allows runoff from the road to flow into the raingarden. This way, the water has a chance to percolate into the groundwater, with any pollution being filtered out in the process. This method of integrating raingardens into developments first came to prominence in Maryland as part of an effort to reduce the amount of polluted runoff flowing into Chesapeake Bay. Back in the 1990s, when I first got interested in raingardens, Prince George's County was frequently cited as the source of manuals for installing these sorts of BMPs (Best Management Practices) in other states.

On higher ground closer to the building, they've planted partridge pea and little bluestem grass, to achieve more of a prairie look.

Some areas are dominated by foxtail grass, which is fun to photograph but likely not the intended vegetation.

In the last photo, below, foxtail finds reflection in the building's windows.

Capturing a Backyard in a Bouquet

A wildflower bouquet offers a summary of a backyard. On the left are the white of boneset with some bright yellow of cup plant peeking out. On the right are mistflower with the deeper purple of ironweed above. Some black-eyed susans (a bred variety) appear orange.

An Inchworm That Wears Camouflage

After a visit to the Community Park Elementary's native garden with some YMCA summer camp kids a couple weeks ago, I sat down to lunch and noticed what looked like a flake of sawdust on my arm. I was about to brush it off when it seemed to move.

Even after a closer look, it still appeared to be a small woodchip that just happened to be able to move on its own volition. A little research showed it to be a camouflaged looper--a kind of inchworm that glues bits of camouflage on its back.

Below is a video that shows it in action.

The camouflaged looper is one of the few invertebrates that creates its own disguise, and can reportedly change the disguise to match whatever vegetation it's on at any given time.

Here's one of the many other posts that can be found about the insect on the internet. The inchworm turns into a Wavy Lined Emerald moth.

Princeton's Underground Brook--Exposed!

There she flow! Ain't she a beaut? Harry's Brook, in all her glory. Where has she been all these years? Why, just beneath the ground, buried alive, embraced by concrete, seven feet wide, seven feet high--spacious compared to most pipes, I suppose, with all the room in the (under)world.

No squeaky wheel, this brook, silent and forgotten while it flows from its beginnings in Palmer Square down past Spring Street and the rest of eastern Princeton towards Carnegie Lake.

Even when it "daylights", which is to say emerges from its underground concrete bondage, at the intersection of Harrison Street and Hamilton Avenue, most people don't notice.

This wasn't always the case. Back when kids had free-range, be-back-for-dinner childhoods, some used to spend part of their summers spelunking, which is to say exploring this manmade underworld, from Harrison Street almost up to Madison Street before the pipe got too small. Must have been nicely air conditioned on a hot summer's day.

On this map, from p. 55 of Princeton's  Environmental Resource Inventory, the Harry's Brook watershed is in off-white. Carnegie Lake is on the right, with a blue line extending towards that black box that used to be the borough's boundaries. The blue line ends abruptly at the "t" in Princeton, which is Harrison Street. From there leftwards on the map to the purple point at Palmer Square, Harry's Brook is underground. When heavy rains fill its concrete corridor to the brim, the brook spills out onto the streets, which can be thought of as ephemeral tributaries of the brook. The streets we drive on are connected by pipes directly to the brook, and are therefore part of it. If the streets are dirty, the brook is dirty.

This photo is at the same location as the first photo, prior to excavation, with two parallel orange lines marking where the brook flows through a clearcut lot on Linden Lane just up from Hamilton Avenue.

A friend sent these photos of the excavation for the basement, looking from the opposite side, with the concrete chamber for the brook exposed there on the left.

In this view of streets from above, the colored line is the creek, which flows underground through the backyards of houses on the south side of Hamilton Avenue.

Before it was put underground, Harry's Brook upstream of Madison Street was made to conform to the grid of downtown Princeton, as seen in this map from 1906.

Untrimmed Tree Brimming With Persimmons

Mmmmm. The forest is rising up around Princeton University's bridge over Washington Road, and in that forest is a persimmon tree or two.

Not quite sure how to reach them. Maybe one of those golf ball retriever thingies would work. They should turn a Princetonian orange when ripe.

The Richness of Richweed

When it comes to flower biology, the more you look, the more you see. Sometimes a single observation can open up a whole new world. What, for instance, is going on here? Some sort of tiny bee is ignoring the main flower and instead doing a high wire act to nibble on the tip of a stamen jutting out from the petals.

I had been content to largely ignore this fairly rare native plant growing in my backyard. It's sometimes called horsebalm (for no clear reason), or stoneroot (for its hard, medicinal root), but I prefer to call it richweed, because it has a preference for rich woodland soil, and the idea that something called a "weed" is also rich is appealing. I had rescued a couple from the path of a stream restoration, had read that it rates 9 on a scale of 10 on the plant stewardship index, and was content just to know it had escaped the bucket of a backhoe. In a mixture of sun and shade, it's fairly attractive when massed, with leaves reminiscent of hydrangea, but the flower doesn't grab one's attention.

This summer, though, with cool weather bringing outdoor comfort and extended flowering lengths, I finally paused long enough to check out what sorts of pollinators the richweed was attracting. Mainly bumblebees, which look perfectly matched for this flower, bobbing from one to another, giving each one a bear hug as they sip the nectar. The flower is so shaped, with the stamens jutting out on either side of the flower, to appear as if the embrace is mutual.

But then there was another kind of bee, smaller, that was, as mentioned, feeding not on the nectar but solely on the pollen at the end of each long stamen.

Stepping inside to browse the internet, word comes that richweed's flowers are lemon scented--fitting for a plant in the mint family. The root has medicinal qualities, and the stamens are described as "exserted", meaning protruding. (Those are the two finger-like protrusions that frame the flower.) One of the perks of learning some botany is that you're likely to encounter words otherwise lost from the english language. The companion for "insert" lives on in descriptions of flowers in dusty botany manuals.

While digging up lost words, why not give the internet a companion as well, i.e. the externet, or outernet--that being the web of life in the real world, the great outdoors, nature. One prompts exploration of the other.

A deeper look at the externet, in the form of a long ignored flower, prompted a deeper look at the internet and what it has to say about richweed. One link led to a discussion of autogamy in The Natural History of Plants. Richweed (Collinsonia canadensis) fertilizes itself when the stigma at the end of the long style (purple with a tiny fork at the end, in the photo) bends over and touches the anther at the end of one of the stamens. Here's how it reads in the book:

"The accomplishment of autogamy through the inclination of a style otherwise straight is of even less usual occurrence. The most striking example of this process is afforded by the bilabiate flowers of the North American Collinsonia canadensis. In the newly-opened blossom the long style stands midway between two exserted stamens which are almost as long as the style. Towards the end of the flower's period of blossom, the style begins to slope towards one of the stamens, moving like the hand of a clock through an angle of from. 20" to 40" until its stigma comes against the pollen-covered anther borne by the stamen in question."

In this photo, you can see the (female) style of the flower on the left reaching over towards the (male) anther of the other, which in "The Botanic Garden, A Poem in Two Parts" becomes invested with great meaning:

"But I was this morning surprised to observe ... the manifest adultery of several females of the plant Collinsonia, who had bent themselves into contact with the males of other flowers of the same plant in their vicinity, neglectful of their own."

It's good to know that, if we ever run out of human indiscretions to feed the rumor mill, plants stand ready to fill the void.

The journey into the internet also brought up a marvelous text by William Bartram, early botanical explorer who made a late 18th century trip through Cherokee country.

"AFTER leaving the low grounds and ascending the hills, discovered the plant I went in search of, which I had before frequently observed in my descent from the Creek nation down towards Taensa. This plant appears to be a species of Collinsonia; it is diuretic and carminative, and esteemed a powerful febrifuge, an infusion of its tops is ordinarily drank at breakfast, and is of an exceeding pleasant taste and flavor; when in flower; which is the time the inhabitants gather it for preservation and use; it possesses a lively aromatic scent, partaking of lemon and aniseed."

Rich it was and rich it remains, this richweed, a valued remnant of the abundant wealth in that wild garden known as America.

Kayaking Up the Mighty Millstone Marsh

If you ever tire of land, Princeton offers a complex of waterways that can be easily navigated by kayak or canoe. There's Carnegie Lake, of course, but also the canal, Stony Brook, and the Millstone River, which flows through a beautiful marsh just a few paddle strokes upstream of Carnegie Lake. A friend, who in the acting world goes by the name of Basha, had been singing the praises of the marsh this year, and we finally headed over there this past Saturday in late afternoon. The put-in is over towards Plainsboro, off Mapleton Road, next to the aquaduct parking lot.

If you've lived in Princeton for ten years without knowing where the aquaduct is, it's where the Millstone River ducks under the DR Canal, downstream of the Harrison Street crossing. Near this "aquaduck" is a pair of mute swans (a species of Eurasian origin, easily distinguised from indigenous trumpeter and tundra swans by its orange bill) that have become the DR Canal's version of rock stars since they had three babies, properly called cygnets. They quickly realized we had no food to offer. Body language here is suggesting which adult is the mother.

The wilder world of native plants and wildlife is accessed by paddling to the left, through a channel bordered by masses of spadderdock,

then under the newish Route 1 bridge.

The channel begins to narrow. The slim profiles of egrets, standing still in the water, become masses of pure white as they spread their wings to fly off. The native rose mallow hibiscus lines the banks in full bloom.

Along the banks and extending deep into the shadows are cardinal flowers, thriving in this year's rains.

Always on the lookout for something new, I found a marsh St. Johnswort (Triadenum virginicum), blooming on the bank.

This, too, was a welcome sight: partridge pea, apparently planted in a restoration site on the east bank. It used to have an easier latin name until someone changed it to Chamaecrista fasciculata. It's closely related to the sensitive pea (smaller) and wild senna (larger), both of which can also be found growing wild in Princeton, particularly along the canal.

One battle I fought for awhile was to get departments of transportation and other governmental entities to stop using the highly invasive Sericea lespedeza for erosion control and start using less obnoxious plants like partridge pea. Sericea lespedeza, also called Chinese bushclover or Lespedeza cuneata, is now taking over the gas pipeline right of way in Princeton, and is a big problem in tallgrass prairies in Kansas and elsewhere.

More successful was the battle fought by Basha and others against the Millstone Bypass, a road that would have been routed close to the Millstone marsh. She's keeping her files, knowing that bad ideas never die.

Another wildflower common in the marsh and along the canal is climbing hempvine. No relation to hemp.

One remarkable sight was wild string beans, produced by the native groundnut. In my garden, it has begun to take over since a tree was taken down and the extra sun fueled this vine's ambitions. Groundnut tends to produce lots of flowers but no beans, as if the flowers were a front organization distracting attention from the underground spread of its tubers. In the wild, it needs that aggressiveness to compete with the other aggressive species along the shores. The tubers, by the way, are said to be edible, and some efforts have been made to breed this plant for commercial food production.

It's a good year for arrowwood Viburnum berries. Note the toothed leaves, thus Viburnum dentatum.

Nearly all the buttonbushes had finished with their golfball sized blooms. Some had improbably oversized leaves. Buttonbush grows well in standing water along the shore, but can also prosper in wet ground in the backyard. In fact, many of the native plants flourishing in the marsh also do well in constructed raingardens in town.

Once you're up in the narrower portion of the marsh, it's best to keep right. Basha showed where heading to the left leads to a deadend. There's a low fallen tree you'll need to duck under at one point.

Mysterious but cleanish looking fluids spill from a pipe with Sarnoff's name and phone number printed above. Just out from this outfall, the surface of the stream is broken by periodic upwellings of water from down below. A faint smell of treated sewage can be detected.

Paddling further up would lead eventually to the overpass for the NJ Transit train, but even a brief visit to the lower end of the marsh has a wild feel to it. Among other sightings were great blue herons, a weasel, turtles, ironweed, and some less charismatic native plants like tearthumb. Beavers like the area, and have been known to slap their tails on the water to warn anyone getting too close.

Even a pile of branches rewards, or warrants, closer inspection.

On the way out, we again passed the resident egrets. A bald eagle flew overhead on its way down Carnegie Lake. Though we could have lingered longer and continued upstream, the whole trip took less than two hours. What a treat to have such habitat so easily accessed just outside of town, and thanks to Basha for the tour.

Housing Authority Apologizes for Raingarden Bulldozing

A quick note to readers that on August 19, after a week of tense exchanges with the Housing Authority, I received an email from the Housing Authority's executive director stating the following:

"First and foremost, I, along with my staff and Board of Commissioners want to offer our sincere apology to you and the community at large for destroying an ecologically friendly community gift. The Princeton Housing Authority and the board certainly appreciate your hard work and dedication in donating your time and effort in the landscaping project. " 

The email goes on to express a desire to move forward in correcting the situation. The email was an important step towards healing, and I look forward to working with Housing staff and board members towards making something positive out of this unfortunate event. I will be posting more on this as time goes on.