Today's Ramble was led by Linda Chafin.
Here's the link to Don's Facebook album for today's Ramble. (All the photos in
this post are compliments of Don.)
Today's post was written by Don Hunter
and Dale Hoyt.
Seventeen Ramblers met today.
Announcements:
Gary
Crider will present a program on control/eradication of invasive plants next Thursday,
May 4, at the Oconee Rivers Audubon Society meeting.
Today's reading was
read by Linda Chafin, an excerpt from an essay titled The Death of a Tree from the book Dune
Boy: The Early Years of a Naturalist, by Edwin Way Teale. You can find the
text in the email with the link to today's post. Teale was a
popular mid-twentieth century nature writer. His most well known books were
devoted to the North American seasons: North
with the Spring, Journey into Summer, Autumn across America and Wandering through Winter. These all
became Book-of-the-Month club selections and the winter book won the Pulitzer
Prize in 1966.
Today's route:
We went down the cement walkway to the Dunson Native Flora Garden and wandered
our way through the DNFG until it was time to return.
Just beyond first switchback, on the left,
there is a Mountain laurel covered
with open flowers.
Downhill from the Mountain laurel, also on
the left, is a large Bottlebrush buckeye
with many stems. Unlike our other native buckeyes that have finished blooming,
the Bottlebrush flowers in summer. It is already sending up inflorescences that
presently bear hundreds of tiny flower buds.
Conical, Witch's hat gall on Witch hazel leaf |
Further downhill, on the right are two
small, shrubby trees, American witch
hazels. Many of the leaves bear one or more cone-shaped galls.
A gall is an
abnormal growth produced on a plant part. They can be caused by a variety of organisms, but most commonly insects or mites. Each species produces
a distinct type of gall, unique in location and shape. The gall is produced
when the insect secretes an unknown substance that causes the plant part to
respond by growing a unique structure that houses and feeds the insect.
The conical galls on the Witch hazel are
produced by an aphid with a complex life history that alternates between two
plants, River birch and Witch hazel. In the spring aphids (Hormaphis hamamelidis) emerge from eggs laid near leaf buds on the
Witch hazel the previous autumn. As the tender leaves emerge the aphids begin
feeding on them (sucking the sap) and the leaf responds by producing the cone shaped structure,
the "witches hat." Meanwhile, the young aphid produces more aphids
asexually (a process called parthenogenesis) and the colony grows in size
inside its cone-shaped house. Later in the year the aphids produce winged forms
that leave the conical gall and fly away to the alternative host plant, a River birch
tree, where several generations of wingless aphids are produced. In the fall
the aphids on the River birch produce winged forms that fly to Witch hazels and
lay eggs near the leaf buds. These eggs overwinter and, in the spring they
hatch to produce the Witch hazel generation again.
Witch hazel has a number of uses. An extract from the
bark is an astringent and is used to relieve bruises and sore muscles. In New
England witch hazel branches are used in "dowsing" to locate
underground sources of water. Dowsing is also known as "water witching" and many people mistakenly assume that this is the
source of the "witch" in the name of the tree. But the name has
nothing to do with witchcraft.
"Witch comes from wych, a variant of the Anglo-Saxon wican, to bend. (This is also the root
word for wicker, which is woven from bendable or pliable branches.)
The name witch-hazel was given to the
shrub because the leaves resembled those of the English elm tree with long,
drooping branches that was known as the wych-elm; that is, "the bending
elm." And the wych-elm was also called wych-hazel, because its leaves
resembled those of the hazel tree. (The origins of elm and hazel, both Old
English, are uncertain.) Over the years, "wych" was transformed into
"witch." (The other kind of witch comes from the early English wicca, a wizard.)"
(Source:
Mary Durant, 1976, Who Named the Daisy? Who Named the Rose?, Dodd,
Mead & Co., p. 210,
The aptly named Big leaf magnolia |
At the bottom of the hill, near the end of
the Shade Garden walkway, there is a Big leaf magnolia. As its name suggests,
it has the largest, simple leaves of all the trees in North America. The only
tree with larger leaves is Devil's walkingstick (Aralia spinosa), but its leaves are not simple, they are doubly or
triply compound. (A compound leaf is divided into smaller leaflets. A
doubly compound leaf has its leaflets further divided into leaflets. And so on,
for the triply compound leaf.)
Dunson Native
Flora Garden:
At the beginning of the DNFG is a single Columbine plant.
Two weeks ago we saw it in bloom and now the fruits are developing. One
interesting observation is that the flower faces downward but the fruits face
the sky. When the flowers appear the flower stalk is curved downward and the
flowers dangle at its end. After they have been pollinated the flower stalk
curves upward and the seed capsules will open at the top. The scientific name,
Aquilegia columba, is derived from two bird references – the Latin aquila, meaning eagle and columba, meaning dove. The five petals
of the flower are said to resemble a group of five doves standing in a circle
with their heads extended toward the sky. The eagle reference is said to be
because the petal resembles an eagle's claw.
Nearby is a Coral honeysuckle vine, easily told from the
introduced honeysuckle by examining the leaves at the tip of the vine. They are
united together, forming an almost circular disk in Coral honeysuckle. This
condition, when two plant parts are joined together is called connate.
Nearby was a Black cohosh, with it's tall flower stalk,
now a long, compact mass of buds. After
some discussion, we decided that the “black” in the common name might refer to the
roots of the plant, which are medicinal.
Terry asked if there was something called blue cohosh. Yes, there is. It's unrelated to the black
cohosh and gets its name from a bluish, waxy coating on the stalks and
stems. They both have large, divided
leaves.
Chattahoochee trillium |
Pale yellow trillium |
A number of trilliums are still in bloom around the garden. We only observed two kinds: Chattahoochee
trillium and Pale yellow trillium.
A few lyreleaf sage still remain in flower.
Pipestem flowers |
A plant on the Georgia species of special concern list,
Pipestem, is currently blooming. Pipestem is in the blueberry family and the white flowers that dangle beneath the leaves
strongly resemble those of blueberries. It is
found in extreme south Georgia. The common name refers to its hollow stems.
Solomon's plume |
Solomon's plume, which resembles Solomon's seal, was
blooming off the path near the stream. It's flowers are in a cluster at the end
of the stem whereas the flowers of Solomon's Seal hand from the stem at each
leaf node.
Because this plan is so similar to Solomon's seal in its vegetative structure it's also known as False Solomon's seal. But many botanists object to the "false" in a plant name under the mistaken idea that it refers to some undesireable quality of the plant. That is clearly a misunderstanding of what false means in this context. It refers not to the plant but to the misperception of the human observer who can mistake it for another kind of plant. (BTW, these purists happily continue to call several different plants "False dandelions.")
Rusty black haw leaf underside; note the rusty hairs on the mid-vein. |
A small a Rusty
blackhaw tree is found next to the path. It is
named for the presence of reddish brown or “rusty” curly hairs along the
mid-vein beneath the leaf.
Piedmont azalea |
A Pinkster or Piedmont azalea, full of beautiful pale
pink flowers, is blooming on the other side of the stream. There is some
confusion about the difference between Rhododendrons and Azaleas. Rhododendrons are evergreen plants
with long, leathery leaves. Azaleas are deciduous. Both are in the genus Rhododenron.
Sweeshrub variety "Athens" |
Not far away from the Piedmont azalea is a sweetshrub
cultivar, Athens, developed by Michael Dirr, a well-known horticulturist now
retired from UGA. Instead of the typical maroon flowers this cultivar has
yellowish-green flowers.
A royal fern, with three large fronds was pointed out
next to the path.
Perfoliate bellwort with seed capsule |
We saw several examples of small, perfoliate bellworts,
past blooming, with three-part shaped fruits. Perfoliate refers to the appearence of the stem passing through the leaf; from per-, meaning through and -foliate, referring to the leaves.
Spherical gall on Pignut hickory |
A Pignut hickory with small spherical gall on one leaflet
grows to the left of the path. This gall is probably produced by a small wasp in
the family Cynipidae, a group that was extensively studied by Alfred Kinsey
before he became interested in sex research.
Yaupon holly; Native Americans made a strong tea of the parched
leaves and drink it as a part of their religious ceremonies. Consumed in large quantities, it causes
vomiting. This is the source of its
scientific name, Ilex vomitoria (Ilex = holly; vomitoria = what it sounds like). It's one of only two hollies known to contain
caffeine in significant concentrations. The other is found in South America and
is widely consumed there; it is known as yerba maté.
We saw several examples of Poa grass along the path. Kentucky bluegrass is also in the genus Poa and is
a European import. It's not necessarily
an invasive though, and is generally easily controlled.
Linda pulled and displayed a specimen of Oriental false
hawksbeard. A nasty invasive, she
encouraged everyone to pull it up if they see it.
Tulip tree flower |
The tulip trees are still flowering, but they are so tall that the only
blossoms we see are those that have been knocked down by the wind or by
squirrels. These are beautiful yellow-orange and green flowers. This tree is often called a yellow poplar or
a tulip poplar, but it is not a poplar. It is a member of the Magnolia family.
We hit a patch of Canada wild ginger, with flowers. The flower was a little fancier than our
normal wild ginger. The Canada wild
ginger is not evergreen like the common wild ginger.
We next stopped to look at an enormous Jack-in-the-pulpit. When they are as large as the one we were
looking at, they are most likely female plants and can set large fruit. Linda peered inside the “Jill” and thought
she could see a small fruit developing.
We will try to check on this particular plant later in the season to see
if produces a spike of red berries.
We saw an example of ovate catchfly or oval-leaved
campion, though the flowers were long gone.
It's also on the Georgia special concerns list, being found in only ten counties
scattered throughout the state.
Fringed campion |
A big surprise for us today was seeing several fringed
campions, with their beautiful pink fringed flowers. No one in the group could remember ever
seeing this plant in the Dunson garden before.
The common name, "catchfly," used for some species of campions, refers to the sticky, glandular hairs on the stems. Small flying insects are often found held fast to these stems and it has been demonstrated that ants are attracted to the easy pickings. By attracting ants the plants acquire a "police force" that helps keep insect herbivore away from the rest of the plant. In one study investigators removed all the stuck insects from one group of plants and left another group alone. The plants that had the insects removed had more damaged reproductive structures than the plants with the trapped ant bait.
Crossing one of the small footbridges, we saw a milkvine
climbing up the tree. It is too early to
determine the species. After it flowers,
an exact determination can be made on it's identification. The vine produces a milky latex, which is contained in a system of channels that is separate from
the vascular system that carries the sap. When a leaf is injured, as by the bite of an insect herbivore, the latex leaks out, gumming up the mouthparts of the insect.
Closeup of the center of an Ashe magnolia flower |
Ashe magnolia flower |
As we passed by the two Ashe magnolias, we had to stop
to admire and smell the large, white flowers on each tree. It is often confused with the big leaf
magnolia but, although it also has large leaves, it is a smaller tree and the leaves are not quite as big.
We saw what are probably the last golden ragwort blooms
of the season. They are quickly waning,
with Small's ragwort replacing it as the currently blooming species (locally,
not in the Dunson garden). Butterweed, another species of ragwort (genus Packera, formerly Senecio), is also blooming at this
time. It is currently blooming in the floodplain of the Middle Oconee River at the
Garden.
Another yellow bloomer, tickseed, a coreopsis, was also
seen blooming far off the paths, near the road.
The unusual flowers of Hearts-a-Bustin' |
We stopped to look at a strawberry-bush or
hearts-a-bustin'-with-Love, with many flowers. We were amazed to see the shrub
intact, as this species is usually heavily grazed by deer. It's often called deer ice cream because they
love it so much.
We saw, from a distance, a large yellowwood tree in
blooming. We had stopped by this tree
last time we were in the Dunson garden but it wasn't blooming at that time.
Indian pink |
Several Indian pinks were visible in the middle of the
area between two of the paths. The
common name is another mystery since it has a red and yellow flower and isn't
pink. It is a toxic plant, containing
strychnine.
We walked past a section of garden with many mayapples
and northern maidenhair ferns. A few
“apples” were seen but they were small and withering.
We were disappointed to find that the goldenseal had
already bloomed. We saw no flowers but a
few examples of the fruit that remains after the flower falls apart. Someone with a sharp eye noticed a tiny white-marked
tussock moth on one of the goldenseal leaves.
We passed by a section of the garden dedicated to several
wild ginger species, including Large-flowered Heartleaf and, according to the
signage, Alabama wild ginger. It was
definitely Hexastylis (Asarum) speciosa but we had never heard it called
Alabama wild ginger. It is also known as
Harper's heartleaf ginger.
Oak apple gall showing the interior |
Someone picked up yet another gall, an oak apple
gall. Dale tore it open to show how the larva of a gall wasp is typically
suspended in the center of the hollow gall by a network of radiating structures
attaching it to the inside wall of the the thin, spherical gall. This generally provides protection from
predators such as other wasps but some have developed piercing ovipositors that
can reach to the center of the gall, parasitizing the gall wasp larvae.
Susie noticed a couple of Georgia dwarf trilliums growing
across the path from the location in which they were established. This is good news in that this means that
they are probably very happy in the Dunson garden and have begun to spread.
Nearby we saw a celandine poppy, though it was past
blooming, with several fuzzy fruits.
Deerberry flowers |
We stopped at a deerberry. This is the only species of blueberry in our
area with a wide open flower. If you turn the leaf over you will see it is much
paler than the upper side of the leaf.
Don't bother to eat these berries, they are inedible
We saw many five-leaved Jack-in-the-pulpits and a lone
Atamsco lily as we crossed over the lower section of the garden.
Early meadow rue is beginning to bloom in the lower part
of the Dunson garden. We saw a female
plant with developing flowers.
Making our way back towards the Shade Garden on the upper
path through the Dunson garden, we found Virginia rattlesnake ferns, each plant
with a tall fertile frond. The fertile
frond is another type of leaf that has been modified to produce spores. It is a deciduous fern, the above ground
foliage dying in the fall.
SUMMARY OF
OBSERVED SPECIES:
Mountain
laurel
|
Kalmia
latifolia
|
Bottlebrush
buckeye
|
Aesculus
parviflora
|
American
witch hazel
|
Hammamelis
virginiana
|
Big
leaf magnolia
|
Magnolia
macrophylla
|
Columbine
|
Aquilegia
canadensis
|
Coral
honeysuckle
|
Lonicera
sempervirens
|
Leatherwood
|
Dirca
palustris
|
Black
cohosh
|
Actea
racemosa
(=Cimicifuga racemosa) |
Chattahoochee
trillium
|
Trillium
decipiens
|
Pale
Yellow trillium
|
Trillium
discolor
|
Lyreleaf
sage
|
Salvia
lyrata
|
Pipestem
|
Agarista
populifolia
|
Solomon's
plume
|
Maianthemum
racemosum
(=Smilacina racemosa) |
Rusty
blackhaw
|
Viburnum
rufidulum
|
Piedmont
azalea
|
Rhododendron
canescens
|
Sweetshrub
cultivar, Athena
|
Calycanthus
floridus
|
Royal
fern
|
Osmunda
regalis
|
Perfoliate
bellwort
|
Uvularia
perfoliata
|
Pignut
hickory
|
Carya
glabra
|
Yaupon
holly
|
Ilex
vomitoria
|
Poa
grass
|
Poa
sp.
|
Oriental
false hawksbeard
|
Youngia
japonica
|
Tulip
trees
|
Liriodendron
tulipifera
|
Canada
wild ginger
|
Asarum
canadensis
|
Jack-in-the-pulpit
|
Arisaema
triphyllum
|
Oval-leaved
campion
|
Silene
ovata
|
Milkvine
|
Matelea
sp.
|
Ashe's
magnolia
|
Magnolia
ashei
|
Golden
ragwort
|
Packera
aurea
|
Tickseed
|
Coreopsis
sp.
|
Strawberry-bush
|
Euonymus
americanus
|
Yellowwood
|
Cladrastis
kentuckea
|
Indian
pink
|
Spigelia
marilandica
|
Mayapple
|
Podophyllum
peltatum
|
Northern
maidenhair fern
|
Adiantum
pedatum
|
Fringed
campion
|
Silene
catesbaei
(= Silene polypetala) |
Foam
flower
|
Tiarella
cordifolia
|
Goldenseal
|
Hydrastis
canadensis
|
White-marked
tussock moth
|
Orgyia
leucostigma
|
Large-flowered
Heartleaf
|
Hexastylis
shuttleworthii
|
Alabama
wild ginger
Harper's heartleaf ginger |
Hexastylis
speciosa
|
Georgia
dwarf trillium
|
Trillium
georgianum
|
Celandine
poppy
|
Stylophorum
diphyllum
|
Deerberry
|
Vaccinium
stamineum
|
Atamsco
lily
|
Zephyranthes
atamasca
|
Early
meadow rue
|
Thalictrum
dioicum
|
Virginia
rattlesnake fern
|
Botrypus
virginianus
|