Today's Ramble was lead by Dale Hoyt.
Here's the link to Don's Facebook album for today's Ramble. (All
the photos, except where noted, in this post are compliments of Don.)
Today's post was written by Dale Hoyt.
No.
attendees:
20
Today's
reading:
Dale read an excerpt from an article by Alvaro Jaramillo, Take Note of Taking Notes, that appeared in Bird Watcher's Digest,
2016, vol. 38(6): 33-37:
Identifying
vs. Recognizing
What do we wish we could do as birders?
Well, remembering details is important. We would like to remember that the
least sandpiper is the one with the yellowish legs and that the Philadelphia
vireo has dark lores and a bolder face pattern than the warbling vireo. . . .
If we have gone through the mental gymnastics of figuring that out once, why
does it not stay? How many times will we have to see a fox sparrow before we
are certain that it is a fox sparrow and not the smaller, daintier, and
duller-billed (in color) song sparrow? Doesn't bird identification sometimes
seem like the movie Groundhog Day? It
seems like we replay various scenarios over and over again, and eventually they
sink in, if we are lucky. We are trying to juggle a seemingly endless set of
details that we need to remember: leg color, wing bars, crown stripes and so
on. Eventually, that thought process of identification becomes automatic; you
won't have to think about the details of what makes a streaky sparrow a song
sparrow, it will just automatically reside in your brain in the same way you
recognize friends or family. Essentially, we
do not identify our friends: we recognize them. [emphasis added] It takes a
bit longer, but eventually you also just recognize birds, not identify them.
There will be fewer and fewer that you need to work through in a point-by-point
identification as you become more and more experienced. But what is key here?
Memory.
Announcements:
Nature Ramblers at Sher & Barbara Ali's treehouse |
The
Ali's, Sher and Barbara, invited everyone to a pizza luncheon at their
Treehouse in Winterville. About a dozen Ramblers took advantage of their
generosity and enjoyed enormous quantities of pizza, soft drinks and
scrumptious chocolate cake. Thank you, Sher and Barbara!
For
the remainder of the year our Rambles will start at 8:30AM. (The last Ramble is
November 17.)
Don
discovered Slender Ladies' Tresses orchids in his yard while mowing this week.
Look for photos on his Facebook album this week.
Today's
route:
We took the mulched path to the upper end of the Dunson Native Flora Garden,
crossed the road on the White trail and walked to the power line right-of-way.
Turning right we walked uphill a short distance, then reversed direction and
walked down the RoW, crossing the access road and went a short distance toward
the river. Then we returned to the road and walked up to the cement walkway back
to the Arbor.
Carolina or Green anole basking in a Winged Elm |
No
Ramble during the summer months would be complete without seeing at least one
lizard, and we did at our first stop. Tom spotted a small Carolina or Green anole in the upper branches of a small Winged Elm,
basking in the early morning rays of the sun. I've written about
anoles in the two previous posts. If you've missed those you might want to go
back and see if they satisfy your curiosity. (To find earlier posts just use
the Blog Archive on the right side of the page. It will give you access to all
our Ramble Reports.)
The inflorescence of a red Hurricane lily; those are the stamens projecting out in front of the petals. |
In
the lower part of the Shade Garden are a dozen or more Hurricane Lilies (also known as Surprise Lily or Red Spider
Lily). These flowers are native to China and Japan and are in the Amaryllis
family, which means that nearly every part is toxic, so deer will leave them
alone. The Hurricane name refers to the late summer season in which the flowers
appear, about the time when hurricanes or tropical storms begin to threaten the
Atlantic coastal states. The odd thing about the plants is that the flower and
foliage appear at different times of the year. The naked stems with their
flowers emerge suddenly during late summer (the origin of the Surprise name) but
the foliage only appears after the flowers are gone. It persists sometimes
through the winter and then disappears in the spring. There is no sign of the
plant during the summer until the flower stalk pops up again in August.
We
spent some time today looking at trees. Our focus was, as today's reading
suggested, identifying trees, with
the hope that we will all be able to recognize
different trees in the future. To that end here are some terms that help us
communicate the characteristics of trees (and other plants, as well).
The parts of a simple leaf and a compound leaf |
What a
leaf is:
There are actually two types of leaves, simple
and compound. Simple leaves are just
single, flat green things attached to a twig or stem. They might have a smooth
shape, wavy edges, lobes, points or other shapes. Examples of familiar trees
with simple leaves are Oaks, Dogwood, Sweet Gum or most Maples. But other
trees, like Pecans or Hickories, have compound leaves – leaves that are made up
of many smaller leaflets. For most beginners this poses a problem: how do you
tell a leaf from a leaflet? There are two ways. You can wait until autumn and
see what the largest unit that falls off a tree is. That largest unit is the
leaf. The second way doesn't require waiting that long. At the point where the
leaf is attached to the twig there is a bud. The bud looks like a small,
dark-colored bump. Inside the bud is a developing leaf or shoot that will
appear next year. So if you look carefully at where the leaf is attached and
don't find a bud you are looking at a leaflet of a compound leaf. (In a few
plants the bud is concealed by the leaf stem that connects the leaf to the
twig, so this rule only works about 99.9 % of the time.) You can also look for the base of the petiole, which is usually (but not always) swollen at the point where it is attached to the twig. If what you think is the petiole is not swollen and there is not bud at that point, then you're probably looking at a leaflet. With a little experience looking at tree leaves you'll soon be able to recognize compound leaves pretty easily.
This
is the first step in learning to identify or recognize different trees: are the
leaves simple or compound?
The
next step is to see how the leaves are arranged on the twig or branch: alternate or opposite. Those terms are pretty clear. If you look at a twig and see that
the leaves are paired, one on each side of the twig at the same point, they are
opposite. Alternate leaf arrangement is the opposite of opposite. (A few
plants have a whorled leaf arrangement – three or more leaves that emerge from
the stem at the same point.)
The first group of trees we looked at today mostly had simple, alternate leaves. The two exceptions were the Hickory, which has compound leaves, and the Mimosa, which has doubly compound leaves..
American
Beech:
Smooth, gray bark (often with initials carved in it); simple, alternate leaves
with wavy edges (bluntly serrate) and papery thin.
Winged Elm; not the corky ridges on the twig and the jagged edges of the simple leaves. Also the size and shape of the leaves is helpful: small and eye-shaped. |
Winged
Elm:
Small, simple, alternate leaves with saw-toothed (serrate) edges, eye-shaped
(symmetrically pointed at each end); twigs and young branches often, but not
always, with corky ridges, called "wings."
Deep, blocky ridges are characteristic of Sourwood trees. |
Sourwood: Older
trees have bark that is thrown up in thick ridges; simple, alternate leaves
that are symmetrically pointed at each end and much longer than wide. Nectar is
a source of excellent honey with a long shelf life. The trunk often grows with
more twists and turns than other trees.
The light gray bark and simple leaves with rounded lobes tells you this is a White Oak. |
White
Oak:
Simple, alternate leaves that are have rounded lobes; lobe ends lack sharp,
prickly point. Bark is gray or light gray in color and on the upper trunk it is
shingle-like in appearence.
The roughly cross-shaped Post Oak leaf. |
Post Oak:
Simple, alternate lobed leaves; two lobes larger than the others, giving the
leaf a rough cross shape.
Fruits of Hophornbeam; each papery sack encloses a single seed. |
Hophornbeam leaf; look closely to see the doubly serrate edges. |
Hophornbeam:
Simple, alternate lobed leaves with saw tooth edges and some of the teeth have
tinier saw teeth on them, making them doubly serrate. Older bark is "shreddy," looking like a cat
scratched it. The wood is among the densest of all North American trees and
very resistant to breaking. The common name comes from the fruits, which
resemble the Hops used to flavor beer and use of the wood to yoke oxen.This small, understory tree is one of the commonest in the natural areas of the Botanical Garden.
A small tree/shrub with compound leaves gave us some identification problems. Don and I both thought it was a Sumac, but Don looked closely at the leaflets and discovered that they had finely serrate edges, which Sumac lacks. So what is it? We finally settled on Ailanthus (also known as Tree of Heaven), a tree from Asia was once widely planted in urban areas of the northeast. (It is the tree in "A Tree Grows in Brooklyn.") Ailanthus tolerates urban pollution, grows rapidly, produces thousands of seeds and has a distinctive, foul odor.
The compound leaves of Ailanthus are arranged alternately on the stem. |
The doubly compound leaf of Mimosa. |
Someone handed me a leaf from a Mimosa, a widely planted and invasive small tree in the Bean family. It has compound leaves with a vengence -- they are doubly compound. In the picture above I'm holding one single Mimosa leaf. You can see that each of the leaflets is further subdivided into many miniature leaflets.
The red berries and simple, alternate leaves of Carolina Buckthorn. The berries will turn black when they are ripe. |
On
the southwest corner of the White trail where it intersects the road is a small
tree that I never noticed for five years. Weds. I noticed that it had red
berries and I puzzled over its identity, consulting several references and
never reaching a comfortable decision. I tentatively thought it might be a
Deciduous Holly, but there is a labeled Deciduous Holly in the Dunson Garden
and its leaves bear no resemblance to this tree. Today Don figured out that it
was a Carolina Buckthorn, a very uncommon understory tree. The red berries were what led me down the garden
path; they become black when they mature.
River Oats or Fish-on-a-Pole |
River
Oats is a neat looking grass that resembles its other common name: Fish on a
Pole. It is a self-seeding perennial and speads easily. Some gardners think
maybe a little too easily. One of our Ramblers remarked that they heard Elaine
Nash say that it was the only plant she knew that would eliminate Microstegium (an introduced, highly
invasive Asian grass). If I got the story right, Elaine planted River Oats with
or near the Microstegium and kept
mowing the area. After three years the Microstegium
was gone and the River Oats had taken over. This may have worked because Microstegium is an annual grass. The
plant dies after it has set seed and frequent mowing would remove the flowers
before they could produce any seed. After the first year any new Microstegium
would arise from existing seeds in the soil. That seed bank would decrease year
after year if it was not renewed. This would not be a practical solution in
situations that cannot be easily mowed or mowed with religious regularity.
The
part of the power line RoW north of the White trail is being actively managed
to create a Piedmont prairie, an ecosystem that used to be common in the
piedmont of Georgia. The Piedmont prairie was dominated by grasses and forbs
with widely scattered trees. Last year Garden personnel and volunteers planted hundreds
of native prairie grasses and herbs and the Lanier Center is currently
propagating more plants.
The
hill south of the White trail was part of the formal garden years ago and is now
a lawn dominated by Bermuda and Fescue grasses. The long term plans are to also
convert it to a prairie, but to do that the lawn grasses must be removed so
that native grasses can be established there. Right now the garden is testing
ways to eliminate these non-native grasses and that is the purpose of the
square plots you see to the south. (Earlier in the year a graduate student,
Lauren Muller, told us about
these plans.) Once the most efficient and effective method of getting rid
of Bermuda grass is determined this area will also be converted to a prairie.
One
of the grasses in the prairie is seen as a purple haze floating above the
vegetation. The haze is produced by the massed flowering heads of the Purple top grass. If you grasp the
flower stalks of this grass and pull it through your hand you will be left with
a waxy feeling that is responsible for the other common name for this grass:
"Greasy grass."
Frostweed stem showing the "wings" that give the group the common name: Wingstem. |
A different species of Wingstem with wings on the stem. |
The white flowers of Frostweed |
Sweet Autumn Clematis flower (non-native species) |
Sweet Autumn Clematis leaflets have smooth edges |
Virgin's Bower (native species) leaflets have roughly toothed edges. |
Today
we saw two kinds of Clematis, Virgin's Bower, our native species, and Sweet
Autumn Clematis, an introduced and very aggressive species. They look very
similar but the easiest way to tell them apart is to examine the edges of the
leaflets. Those of Virgin's Bower have roughly toothed edges, while the leaflet
edges of Sweet Autumn Clematis are smooth.
Silvery Checkerspot on my hand; the white centers in some black spots toward the edge of the hind wings are diagnostic for this species. |
On the lower part of the power line RoW I held my hand up to shade my eyes from the sun and something landed on it -- a Silvery Checkerspot butterfly. It stayed there for several minutes, long enough to warm up and have its picture taken. Then it was off for other adventures.
Gulf Fritillary caterpillars; the one on my thumb has just recently hatched; the larger one is nearing the size to form a chrysalis |
Gulf Fritillary chrysalis (photo taken last year) |
Gulf Fritillary chrysalis; the coloration varies from white to brown. |
Gulf Fritillary adult |
Purple Passionflower fruits |
On the way back to the Arbor we walked up the road and stopped at the Purple Passionflower growing on the deer fence. It was loaded with ripening fruits and Gulf Fritillary caterpillars! We also found a chrysalis attached to the fence! The different Parrionflower species are the only plants that this butterfly feeds on.
Caterpillar of Imperial Moth |
Imperial Moth (photo taken last year) |
That's all, until next week!
SUMMARY OF OBSERVED SPECIES:
Winged elm
|
Ulmus alata
|
Sourwood
|
Oxydendron arboreum
|
Carolina/Green anole
|
Anolis carolinensis
|
Rattlesnake fern
|
Botrychium virginianum
|
Jack in the pulpit
|
Arisaema triphyllum
|
Hurricane/Surprise lily
|
Lycoris radiata
|
Oyster mushroom
|
Pleurotus ostreatus
|
Carolina buckthorn
|
Ramnus caroliniana
|
American beech
|
Fagus grandifolia
|
Yaupon holly
|
Ilex vomitoria
|
White oak
|
Quercus alba
|
Post oak
|
Quercus stellata
|
River oats
|
Chasmanthium latifolium
|
Ailanthus shrub/Tree of Heaven
|
Ailanthus altissima
|
Hophornbeam
|
Ostrya virginiana
|
Mockernut hickory
|
Carya tomentosa
|
Mimosa
|
Albizia julibrissin
|
Wild (Neopolitan) garlic
|
Allium neapolitanum
|
Purple-top grass/greasy grass
|
Tridens flavus cupreus
|
Virginia buttonweed
|
Diodia virginiana
|
Sweet autumn olive clematis
|
Clematis ternifolia
|
Mountain mint
|
Pycnanthemum incanum
|
Frostweed/White crownbeard
|
Verbesina virginica
|
Red-banded hairstreak
|
Calycopis cecrops
|
Carolina desert chicory
|
Pyrrhopappus carolinianus
|
Sedge
|
|
Rabbit tobacco
|
Pseudognaphalium obtusifolium
|
Flowering spurge
|
Euphorbia corollata
|
Silvery checkerspot
|
Chlosyne nycteis
|
Tall thistle
|
Cirsium altissimum
|
Yellow crownbeard
|
Verbesina occidentalis
|
Virgin's bower
|
Clematis virginiana
|
American pokeweed
|
Phytolacca americana
|
Wild heliotrope
|
Heliotropium amplexicaule
|
Blueberry
|
Vaccinium corymbosum
|
Spotted beebalm
|
Monarda punctata
|
Various hibiscus
|
|
Deciduous holly
|
Ilex decidua
|
Passionvine
|
Passiflora incarnata
|
Gulf fritillary caterpillar
|
Agraulis vanillae
|
Gulf fritillary chrysalis
|
Agraulis vanillae
|
American beautyberry
|
Callicarpa americana
|
Garden orbweaver spider
|
Neoscona crucifera
|
Imperial moth caterpillar |
Eacles imperialis
|
Bird's nest fungi
|
Nidulariaceae family
|