Blue Ridge Illustrated: Oaks of Matthews State Forest
14 students spent two hours in the field defining the difference between the bark, acorns, leaves and tree structure of six species of oaks in the forest while effectively blocking out the myriad of other species in the forest. Their investigative efforts began the latest BRDC poster: The Oaks of Matthews State Forest.
Anytime one dives into a new field of identification, be it birds, butterflies, flowers, or in this case trees, it is best to choose one "family" of similar species and hone in on those for clarity. That is exactly what we did at Matthews State Forest last Friday morning with the Galax High School Art Class. 14 students spent two hours in the field defining the difference between the bark, acorns, leaves and tree structure of six species of oaks while effectively blocking out the myriad of other species in the forest. Their investigative efforts began the latest BRDC poster: The Oaks of Matthews State Forest.
The exploration began with a compare and contrast exercise in the shapes of leaves collected from the forest floor. First they decided which were representatives of oaks and which were not. Then they defined a rounded lobe versus a pointed lobe to separate the white oaks from the reds. Lastly they looked at color and sinus depth to separate the collection of leaves into five clearly defined species.
We then filtered back into the woods to find the leaves hanging on the trees where they documented each species with bark and leaf rubbings. Once the trees were identified the students scratched the forest floor for acorn samples to take back to the classroom. On our return trip we added one more species to the list, a post oak just off the path for a total of six species. They begin the in-class scientific illustrations this week!
Identified in the forest were:
Northern Red Oak, Quercus rubra
Black Oak, Quercus velutina
Scarlet Oak, Quercus coccinea
White Oak, Quercus alba
Post Oak, Quercus stellata
Chestnut Oak, Quercus prinus
Lava reaching skyward
This past Sunday, a group of us Charlottesville folk went to Humpback rocks up on the Blue Ridge (mile 5.8 on the Blue Ridge Parkway). We enjoy being within a twenty minute drive of these higher elevations...and we aren't alone. The parking lot was packed, and the nearby by living farm exhibit gets year around attention. The trip up there is always amazing because the landscape changes so dramatically before ones eyes...and your ears "pop". Interstate 64 climbs diagonally up the mountain cutting through thick deposits of metamorphosed lava. We were time travelers ...traveling forward in time to see denuded trees that will dominate our view down on the Piedmont in a couple of weeks; our trees are still hanging on to leaves...especially the oaks, hickories, and invasives (pawlonia, white mulberry, etc.). We were also traveling through
a complex geologic landscape, ultimately ending up in meta-basalts deposited when central Virginia was well south of the equator, and turned 90 degrees east!
We all met at the parking lot, the kids poured out, and off we went into a woods known for its high black bear population. Some estimates claim that 3 bear live upon every 2 square miles of woods....that's quite a bit. The nearby Shenandoah National Park boasts the largest population of black bears in the east. This is not the time of year to see them though...late spring and early summer is when you can catch them moving about as mating season kicks in.
An immediate thing noticed when one looks up from the parking lot is that a strenuous hike is about to be had. The hike covers over 1000 feet of elevation in less than a mile...with some mild rock climbing thrown in there. Half our kids had to be carried. The others had something else in mind....a race to the top!
We moved up the mountain, over outcroppings of 570 million year old Greenstone (young for Blue Ridge Rocks!). These rocks are old lava flows that once covered great amounts of what are today Virginia and Maryland. The rock is hard, very hard, and thus resists erosion. This greenstone holds up most of the peaks and ridges for most of the way thirteen miles south and over a hundred miles to the north.
The forest was dominated by
,
, and Hickory(
,
, and
).
,
, and
were the dominant understory trees. A few old field relics were scattered about in the forest, including large Flowering Dogwoods and Black Locusts, which were probably the oldest trees we saw at Humpback.
One of the familiar and signifying attributes of the dying black locusts is the polypore it plays host to, the
. So far as I know, it only grows on the Black Locust!
Along the trail we occasionally encountered enormous Chestnut Oaks. Check out the size of the one John's leaning on! Also notice the very distinct bark of the Chestnut oak...so deeply furrowed.
We also found several witchhazel in late bloom (see image with the inset), all but a few had dropped their long and wispy yellow petals and stamens, leaving behind these curved sepals.
All adults and kids (all five under the age of 5) made it to the top! I've tried this on two other occasions, without luck. Must have been somethin in the air! The view was magnificent.
