Today's Ramble was led by Linda Chafin.
Here's the link to Don's Facebook album for today's Ramble. Don also has posted a sequence of photos showing the aggressive encounter between two Carolina anoles; description later in this post. (All the photos in this post
are compliments of Don.)
Today's post was written by Don Hunter and Linda Chafin with a
few additions by Dale Hoyt.
Twenty-two Ramblers met today.
Announcements:
Emily
announced that the cancelled April 5th walk at Sandy Creek Nature Center has
been rescheduled for Wednesday, May 3.
Mike Wharton will lead the walk through the managed forest project areas
recently cleared and planted.
There
are still a few openings for the Rock and Shoals walk this Saturday. Meet at the Shade Garden arbor to car pool
over to the trail head. An excellent survey of the geology, history and flora
of Georgia's granite outcrops is available at this
link.
Reading:
Sue
Wilde read a piece from the October16, 2016, New York Times magazine: How to check out an injured bird.
Today's
Route: We began with an observation at the Shade
Garden arbor then walked down and across the Flower Bridge and through the
various formal garden areas behind the conservatory, winding up at Cafe Botanica
for coffee, snacks and conversation.
Shade
Garden Arbor:
Ohio spiderwort |
Ohio spiderwort is planted around the base of
the ginkgos between the arbor and the parking lot. It has a smooth (hairless)
stem.
Ginkgo new leaf growth |
The Ginkgo trees continue to recover from the freeze damage incurred
back in March. Many replacement leaves
have reached full size.
American South Renovation Garden:
Eastern Bluestar |
Fringed Bluestar |
Louisiana Bluestar |
Carolina
geranium is present but not blooming yet.
Georgia rockcress |
Tall, spindly Georgia
rockcress is blooming. This plant is a crucifer and has white flowers with four-petals
arranged in a "+" pattern, typical of the crucifer family. Crucifer
means "bearing a cross" and refers to the shape of the flowers.
Blue Wild indigo |
White Wild indigo |
Yellow Wild indigo |
Since some reject the idea of calling plants “false,” we call this group of beautiful natives “Wild Indigos.” There are three species planted in this area: White Wild Indigo (Baptisia alba), Blue Wild Indigo (Baptisia australis), and Narrow-pod White Wild Indigo (Baptisia albescens). White Wild Indigo has distinctively colored stems, a dull metallic purple or gray.
Indigo was one of the first economically important crops for
colonists in South Carolina and Georgia. (For more information on the
importance of indigo you should read this article in the New Georgia Encyclopedia.)
Woodland Phlox |
Woodland
phlox could be seen growing along the right-hand side of the path as we
made our way towards the Flower Bridge. Its
the only phlox to bloom in shades of blue, but can tend towards bluish
purple. All other species of phlox tend
toward pinks or distinctly purple. We
saw several, however, that had thrown up a nearly white mutation. It is now blooming in large numbers in the
mountainous areas of north Georgia and other nearby southeastern states.
Lyre-leaf sage |
While
stopped to admire the
phlox, we saw a few lyre-leaved sage plants, with their pale
purple flowers and
distinctive green and purple lyre-shaped basal leaves. Several
folks chimed in
that they had always thought of lyre-leaved sage as a common
invasive species
but it is, in fact, a native plant and is garnering a bit more
appreciation
among the group. It’s a mint with its square stems and tubular,
two-lipped
flowers but its leaves are all basal.
Nearby we saw a large and healthy Kentucky
yellowwood. Presence of this tree in
an area is an indicator of high quality, nutrient rich moist forests in the
mountainous areas in which its found. They can be found in virgin, unforested
coves. The bark looks much like the
smooth bark of American beech trees.
Linda pulled up an example of one of the worst invasive species to
be found in the area, Oriental false
hawksbeard. It is an annual and
spreads rapidly if not pulled before dropping seeds.
Two-winged silverbell |
Right before we arrived at the Flower Bridge, we stopped to admire
a large silverbell tree, full of large white flowers. The tree still bore old fruit from last year,
with two wings. Because the fruit had
two wings, it is identified as Two-winged
silverbell.
Path up to China and Asia section:
Oconee Azalea |
At the far side of the Flower Bridge, we stopped to look at an Oconee azalea, with beautiful orange
flowers. It is not as bright and red or
red orange as the flame azalea more common in the mountains.
While standing at the bridge, Linda pointed out the Big-leaf magnolia. There were many large, dead leaves on the
ground below the tree. Dale has pointed
out before the amazing fact that all of the cells present in each leaf were
present when the leaf was in bud stage.
No new cells were created during
the growth and expansion of each leaf from its original bud. Each cell expands as the tree pumps water
into the leaf cells, ultimately causing the leaf to increase in size to their
current size.
Leaving the bridge, we quickly came up on an example of the
Florida azalea. Its flowers, rapidly approaching the end of
their run, were yellow and beginning to wither. Species of wild
native azaleas can be distinguished by, among other things,
their flower color and size, how long the flower tubes are
compared to the length of the flower lobes, and how hairy or
sticky the outside of the flower is. Stickiness in flowers
evolved to deter ants from entering the flower and stealing the
nectar.
We stopped to ponder the ID of a large tree growing back from the
path. Someone asked if it was a large
Florida torreya. We were quite surprised
to find, after reading the tag, that it was a California redwood.
Alabama snow wreath |
Before
arriving at the path to the bog garden overlook, we spotted the
hedge of Alabama snow wreath (Neviusia alabamensis)
that borders the Threatened and Endangered species garden. It is
a really rare plant, not only in Georgia, but throughout its
entire range (Missouri and Arkansas east to northwest Georgia.)
It makes a gorgeous hedge. They usually flower profusely but
rarely produce offspring, spreading by rhizomes. The reason why? No one is sure but maybe
it's main pollinators have gone extinct. Or perhaps its flowers
require cross-pollination and populations are too widely
separated for cross-pollination to take place.
We also
saw what appeared
to be a locust tree but the “leaflets” were actually little
needles; it turned
out to be Dawn Redwood, (Metasequoia
glyptostroboides). This is an extremely rare species in
its native China,
found in only one county in the Hubei province. It is considered
a “living
fossil,” with abundant examples in the fossil record. It is in
the same plant
family (Cupressaceae) as the California Redwood we saw earlier
and can also
become a very large tree, up to 200 feet tall.
Threatened and Endangered Species Garden:
We saw a few Indian pinks
in bud. Never eat Indian pink...its in
the strychnine family and is considered poisonous.
Small-flowered anise |
Not far away, a Small-flowered
anise shrub could be seen blooming.
It is a very common, planted everywhere in the southeast, particularly
along highways. Its native habitat is in
northern Florida along stream runs. It
loves having “wet feet” but appears to do well even in the dry ground where it
is found in the Bot Garden.
We saw hairy
spiderwort
growing next to the path. It is distinguished from the smooth
spiderwort by its
fuzzy stems, leaves, and buds. It is found mostly on and around
Piedmont
granite outcrops but like the other spiderworts, is easy to grow
in gardens.
All spiderworts have hairy stamens that reminded someone of
spider legs or
spider webs.
We saw Hairy rattleweed,
so named because it is covered with fine, white hairs.
Sundrop
foliage was seen but no flowers were present at this time.
We saw a small, compact bush of False rosemary, a common plant seen in Florida. It is also known as Florida or hairy
rosemary.
On our way around to the Pitcher Plant Bog, we passed by an
extremely red poppy.
Pitcher Plant Bog:
Yellow pitcher plant flower |
Red pitcher plant flowers |
We saw several different pitcher plants growing in the bog,
including red, yellow and white colored species. There are six species of pitcher plants found
in Georgia. The Garden has tried to get
examples of each species for the bog. The
pitcher is actually a highly modified leaf. If you imagine a long leaf rolled
into a tube and the free edges stuck together you get the general shape. The
cap is simply the terminal part of the leaf that did not participate in the
tube and is bent over, covering the opening to the tube. The interior of the
tube is smooth and covered in wax in some species, so that insects that enter
cannot crawl back up. Water accumulates in the pitcher and the insects drown
and decompose, releasing the phosphorus and nitrogenous compounds that their bodies were made of. Since the
environments where pitcher plants are found growing are frequently low in
nitrogen, they can grow where other plants cannot. Other carnivorous plants,
like sundews and Venus' fly traps, are found growing with pitcher plants in
bogs. White topped pitcher plant is another pitcher plant found in the bog
garden. There are only a couple of
populations of this species found in Georgia.
White lance-leaf violet |
Along the front of the bog area, a number of White lance-leaf violets were seen blooming.
Native Indian Southeastern Tribes and Herb and Physic Garden:
Walking away from the Pitcher Plant Bog,
we stopped at a large Japanese maple, which was fully leafed out and
sporting the occasional bundle of red and green samaras.
Anole aggressive interaction
Those lucky enough to attend today's Ramble were treated to an uncommon event: witnessing two male Carolina anoles engage in combat.
Male anoles occupy and defend a home territory. They signal their ownership by periodically performing a "push-up display" in which they bob, raising their anterior end up and down in rapid succession while expanding their dewlap. The dewlap is a fold of pinkish red skin beneath the throat. When displaying the dewlap a rod at the base of the tongue is swung down, stretching the skin and showing the colored skin between the scales. During this display the body is usually not compressed laterally, there is no prominent dorsal crest and the patch of skin behind the eye is the same color as the rest of the surrounding skin.
The dewlap display is often given when no other lizards are visible but always when another lizard approaches. If the approaching lizard is a female the display acts as a courtship signal. When a male approaches the display acts to inform the approacher of the displaying males size. Both males may display their dewlaps and if there is a disparity in size the smaller male usually retreats.
But if the males are both the same size the confrontation can escalate, as happened this morning. The lizards flatten their bodies laterally and erect a dorsal crest that runs down the middle of their back, increasing their apparent size. At the same time an intensely black patch of skin appears behind the eye and they warily approach one another. If neither lizard backs down they will attack one another, biting whatever they can.
Anole aggressive interaction
Those lucky enough to attend today's Ramble were treated to an uncommon event: witnessing two male Carolina anoles engage in combat.
Male anoles occupy and defend a home territory. They signal their ownership by periodically performing a "push-up display" in which they bob, raising their anterior end up and down in rapid succession while expanding their dewlap. The dewlap is a fold of pinkish red skin beneath the throat. When displaying the dewlap a rod at the base of the tongue is swung down, stretching the skin and showing the colored skin between the scales. During this display the body is usually not compressed laterally, there is no prominent dorsal crest and the patch of skin behind the eye is the same color as the rest of the surrounding skin.
Male anole with expanded dewlap |
But if the males are both the same size the confrontation can escalate, as happened this morning. The lizards flatten their bodies laterally and erect a dorsal crest that runs down the middle of their back, increasing their apparent size. At the same time an intensely black patch of skin appears behind the eye and they warily approach one another. If neither lizard backs down they will attack one another, biting whatever they can.
The anole at the top clearly shows lateral compression; both have dorsal crests. |
Anoles preparing to fight; the black post-orbital patch is clearly visible in the anole on the left. |
They approached and circled several times, each time getting closer
and closer. Finally, after approaching less than an inch from each other, one
of the two attacked the other. Each bit the
other and they went twisting and rolling, falling off the far side of the
wall. They quickly climbed back on the
wall but went their separate ways, one going up into a shrub and the other
scurrying across the path away from the wall.
Pawpaw flowers |
The Paw paw trees were covered
with maroon flowers. When sniffing the
flowers, a slightly unpleasant odor could be detected. It has been described as a carrion-like odor,
which. along with the color of the flower, which suggests rotting meat,
encourages flies to visit the flowers. Others have described the odor of the
flowers to have a yeasty aroma, which should be attractive to fruit flies or
fungus flies. In either case flies would appear to be the major pollinators.
Behind the paw paws, a large patch of Mayapples
was visible.
Sweetshrub "Athens" |
Linda stopped to show the group a Sweetshrub. This one is a yellowish-green flowering
variety introduced to the horticultural trade by UGA professor Michael Dirr. He
had a number of Sweetshrubs in his backyard and noticed one producing yellowish-green
flowers instead of the more common maroon flowers. He propagated this lone plant from cuttings and
marketed it as the variety "Athens." There is no sharp distinction
between the sepals and the petals of the Sweetshrub flowers; they are
collectively called "tepals." Pollination is by beetles and is called
“mess and spoil” pollination because the beetles get into the flowers and make
a mess. The tepals are arranged so that
beetles can easily enter, but cannot escape until the tepals relax, allowing
them to visit another flower. Inside the flower they feed on special
protein-rich structures on the inner tepals, stamens and other, stamen-like
structures. While feeding they become covered in pollen. When the tepals relax
the beetles can escape and fly to another flower and effect pollination there.
Ox-eye daisy |
Right as we were ending the Ramble, we
stopped at a patch of Ox-eye daisies.
They are technically considered invasive plants but are pretty well
behaved, sticking mainly to roadsides.
It used to be called Chrysanthemum
leucanthemum which means white flowered chrysanthemum.
SUMMARY OF OBSERVED SPECIES:
Eastern bluestar
|
Amsonia tabernaemontana
|
Louisiana bluestar
|
Amsonia ludoviciana
|
Texas bluestar
|
Amsonia ciliata
|
Lowbush blueberry
|
Vaccinium angustifolium
|
Carolina geranium
|
Geranium carolinianum
|
Georgia rockcress
|
Arabis georgiana
|
Wild blue indigo
|
Baptisia australis
|
Spiked white false indigo
|
Baptisia albescens
|
Yellow false indigo
|
Baptisia tinctoria
|
Woodland phlox
|
Phlox divaricata
|
Lyre leaf sage
|
Salvia lyrata
|
Kentucky yellowwood
|
Cladrastis kentuckea
|
Orienta false hawksbeard
|
Youngia japonica
|
Two-winged silverbell
|
Halesia diptera
|
Oconee azalea
|
Rhododendron flammeum
|
Big leaf magnolia
|
Magnolia macrophylla
|
Florida azalea
|
Rhododendron austrinum
|
California redwood
|
Sequoia sempervirens
|
Alabama snow wreath
|
Neviusia alabamensis
|
Dawn sequoia
|
Metasequoia glyptostroboides
|
Indian pink
|
Spigelia marilandica
|
Small-flowered anise
|
Illicium parviflorum
|
Hairy spiderwort
|
Tradescantia hirsuticaulis
|
Hairy rattleweed
|
Baptisia arachnifera
|
Sundrops
|
Oenothera fruticosa
|
False rosemary
|
Conradina canescens
|
Poppy
|
Papaver sp.
|
Red pitcher plant
|
Sarracenia leucophylla
|
Yellow pitcher plant
|
Sarracenia flava
|
White-topped pitcher plant
|
Sarracenia leucophylla
|
Lance-leaf violet
|
Viola lanceolata
|
Japanese maple
|
Acer palmatum
|
Carolina anole
|
Anolis carolinensis
|
Paw paw tree
|
Asimina triloba
|
Mayapple
|
Podophyllum peltatum
|
Sweetshrub
|
Calycanthus floridus “Athena”
|
Ox-eye daisy
|
Leucanthemum vulgare
|