Today's Ramble was led by Dale Hoyt.
The photos in this post, except where
noted, came from Don's Facebook album (here's the link).
Today's post was written by Dale Hoyt.
Twenty six Ramblers met today.
Announcements:
Friday,
June 23, 6:30 to 7:30 PM. Local Poets Bob Ambrose, Jr. and Eugene
Bianchi at Avid Bookstore, 493 Prince Avenue. Click
here for more information.
Today's reading: The entry for
June Fourteenth from Donald Culross Peattie's An Almanac for Modernsm 1980 edition
(originally published 1935):
There is no breeze today except the wind of rumor
that perpetually blows through the cottonwoods, and it would be a mystery where
they find it in this heavy atmosphere unless one examined their leaf stalks
with an attentive eye. For these are flattened and where the heart-shaped blade
joins to the petiole it is as free, almost, to swing as if suspended on a
pivot. The merest whisper of a breeze suffices to set the leaves twirling, to
rustling and talking.
The wise of the earth assure us that all
poplars, like the willows, are trivial trees, short of life, weak of stem, prey
to more ills than mortal man. These things are so, and we are bidden only to
admire the oak and pine, that outlive the centuries, that grow in surety and
have the sterner virtues. But is there no room in the forest for the poplar,
with its restless, talkative foliage? The strong and silent folk of earth – I
would rather praise them than live with them. I have never grumbled at a
chatterbox, providing that her tongue was kind.
Today's route: Through the
Shade Garden to the access road; left on the road to the power line right of
way (RoW), then left on the RoW to the river.
Hentz's orbweaver |
Spider web. Walking down
the sidewalk in the Shade Garden we almost bumped into the web of an orb
weaving spider, possibly Hentz's
Orbweaver. The web spread across the entire width of the sidewalk and some
Ramblers wondered how the spider could manage to get the silk across a space of
about 6 to 10 feet between the shrubs it was attached to. To do so the spider
first sits at the end of a branch and secretes a strand of silk from its
spinnerets at the end of its abdomen. This fine silk is carried by air currents
and its free end ultimately sticks to an object. The spider attaches the end of
her silk to the object on which she is sitting. Then she walks across the
bridge she has just established, reinforcing it with more silk. She will then
walk to the middle of the bridge, attach a silk line there and lower herself to
the ground, extending the silk line as she drops. She uses this new line to
pull the center of the bridge downward. Where the bridge and the newline meet
will be the center of her orb web. She may spin more anchoring lines, but
eventually she returns to the center and begins to lay a silk line in an ever
increasing spiral around the center point of the web.
Passion vine with unopened flower buds. |
Passion vine is climbing up
the deer fencing at the edge of the road toward the bottom of the Dunson
Garden. Last year we found dozens of Gulf Fritillary butterfly caterpillars
devouring the foliage of this plant, as well as several chrysalids (the pupal
stage of the butterfly) hanging from the fence itself.
Today a few of the flowers
were starting to open, or were they yesterday's flowers beginning to wilt? The
flowers of passion vine last only a single day and have one of the most complex
structure of any of our flowering plants. Being a vine it has to find some way
of climbing its support and passion vine uses tendrils.
Each node has a single
tendril growing out, seeking the touch of a support. When it contacts something
it begins to coil, wrapping itself about its new found support. The coiling
extends down to the base of the tendril, drawing the vine closer to the
supporting structure. The tendril is, of course, blind; it curls about anything
stationary, even including another branch of the same plant.
Passion vine flower opening |
Passion vine tendril attached to fence and coiling to pull the vine closer. |
Passion vine flea beetle |
Other insects have a specific
relationship with passion vines. There is a flea beetle that feeds on the vine
in both the adult and larval stages. Signs of its presence are holes made in
the leaves of the plant. Caterpillar damage is evident from removal of leaf
tissue from the edge.
Passion vines are easy to transplant.
Simply take a cutting, place it in water for week or more, until a root begins
to emerge. Then simply plant it in the place you'd like to have it. In our area
it is perennial and will die back over winter. It spreads by a rhizome, so you
will have to keep it in place by mowing. It does well in poor soil and needs
only a sunny place to in order to flower. It is the host plant of two
butterflies: Gulf Fritillary and Variegated Fritillary. The first will only lay
eggs on passion vine and caterpillars of the latter prefer passion vine but
also can develop on violets.
Newly metamorphosed Eastern Spadefoot |
Eastern Spadefoots, which are only
distantly related to toads, are
seldom seen or heard, but we've been finding newly metamorphosed individuals
for a couple of weeks now. Such small toads are a little hard to identify. One of
the features that is diagnostic of the spadefoot is the pupil shape. It's like
a cat's eye – vertically elliptical. Ordinary toads have a horizontally
elliptical pupil. But there is a catch. The shape of an animal's pupil depends
on the amount of light entering the eye. If you have a cat you may have noticed
that at night or in a dimly lit room its pupil is nearly circular, opening
wider to admit more light. Under brighter conditions the pupil becomes more
slit-like. If you look at Don's photo you'll see that the pupil is nearly
circular, but appears to be horizontally elliptical. This is because of the
coloration of the iris. The Eastern Spadefoot iris has four patches of black
pigment arranged around the edge of the iris: top, bottom, forward and
rearward. When the pupil is dilated (circular) it contacts the forward and
rearward patches, causing the pupil to look wider than it actually is. If
you're not convinced I encourage you to visit this website and look at all
the photos of Eastern Spadefoots. There are some with circular pupils and some
with elliptical pupils. Counting from the top of page, photos no. 12 and 13
show recently metamorphosed individuals and their pupils do appear to be
horizontally elliptical. But look closer and you'll see that the pupil is
actually round and touches the dark pigment at the edge of the iris, causing it
to appear elliptical horizontally.
Wingstems. Wingstems are abundant
in lower part of the power line. There are three species in this area and, when
they are flowering, they are easily identified. But without the flowers we can
confidently identify only one, Yellow
crownbeard. It has opposite leaves and the leaves are shaped like the spade
on the Ace of Spades. The other two species have alternate leaves and we
haven't been able, in the absence of flowers, to convince ourselves that we can
separate them on the size or shape of the leaves. Perhaps it's best to wait
until they flower and then compare the leaves.
Just So stories were written by
Rudyard Kipling as entertainment for his daughter. Each told a fanciful story
about how an animal got its special characteristic; e.g., how the elephant got
its trunk, how the leopard got its spots, how the camel got its hump, etc. When
people first discover the many features that plants and animals exhibit it's
natural to wonder about their functions. Why, for example, do wingstems have
those ridges of plant tissue running up their stems? Implicit in the question
is the idea that those "wings" must have a function. Biologists and
natural historians often come up with ideas about such things but if these
ideas can't be tested, then they don't deserve to be called
"hypotheses." If they're not hypotheses then they are best regarded
as "just so stories."
Bunch gall on Goldenrod |
A Goldenrod
Bunch Gall (Apical Gall, Rosette Gall) is formed when small fly lays an egg
in the growing tip of goldenrod plant. The presence of the egg and, later, the
larva of the fly somehow blocks the elongation of the stem, but the stem
continues to produce leaves. Because the stem is no longer elongating the
leaves bunch up at the tip of the goldenrod, forming the gall. Inside the gall
the larva of the fly feeds on the plant tissue. The presence of the gall has
the same effect as cutting the growing tip. It releases buds lower on the stem
from what is called "apical dominance" in plants. These buds are now
free to grow and the secondary sprouts that form will produce flowers later in
the season.
Insects
Carolina grasshopper. See last week's post for pictures of the colorful hind wings of this
otherwise cryptically colored grasshopper.
Japanese beetle, if abundant, can be real pests. A large group of adult beetles can defoliate
many plants in short order. Additionally, the larvae are grubs that live in the
soil and can cause damage to lawns. It's a shame that the adults are so
beautifully colored.
Silvery checkerspot caterpillar |
A Silvery checkerspot caterpillar was
spotted feeding on a wingstem leaf. Some people don't like wingstems because
they are "aggressive." But without them we wouldn't have the
beautiful Silvery checkerspot butterflies.
Tree cricket nymph (?) |
Nathan caught an immature
nymph of what I'm guessing is a Tree
Cricket (Oecanthus sp.). Immature
stages of Orthopterans (grasshoppers, katydids, crickets and relatives) are
difficult to identify. Most insect guides only illustrate and describe the
adult and the nymphs can sometimes look very different. My guess is based on
the first two segments of the antennae: they are both enlarged, which is
typical of tree crickets. Incidentally, the call of a tree cricket is very
melodious, not at all like the chirp-chirp of the ordinary cricket. In spite of
the common name tree crickets can also be found on shrubs and other low growing
vegetation.
Two lined spittlebug |
Lady bug larva |
Nathan also caught
a two-lined spittlebug and a Lady beetle larva. The spittlebug is
the adult stage of the immature spittlebug, the insect that makes the globs of
spittle you sometimes see on the stems of various plants.
The lady
beetle (or lady bug, if you insist) doesn't look anything like the adult
beetle. It reminds me of a tiny alligator, decorated in orange and black. Both
the adult lady bug and its larva are voracious eaters of aphids.
Grasshopper nymph; the wing bud is visible just behind the first thorax segment, just below my fingenail. |
Someone got
a small, green grasshopper nymph, which gives me an excuse to tell you about
the difference between nymphs and larvae. Insects can be divided into two major
groups: those that develop gradually and those the undergo metamorphosis. The
gradual developers hatch from the egg looking like tiny adults. As they grow
they shed their "skin," really their exoskeleton, several times, each
time growing a bit larger. During these early stages the wings are not obvious –
they're just small pads located behind the first thoracic segment. With each
molt they get a little bigger, until the final shed when they reach adult size
and can function as wings. Examples of insects with gradual development (also
called incomplete metamorphosis) are: grasshoppers, katydids, crickets, praying
mantis, walking sticks, true bugs and aphids. The immature stages of these
insects are called nymphs.
The
immature stages of insects with complete metamorphosis are called larvae and look nothing like the
adults. They also have a developmental stage between the larva and the adult,
called the pupa. It is in the pupal
stage of development that the larval tissues are destroyed and consumed to make
the adult form. Examples of common insects with complete metamorphosis are:
butterflies, moths, ants, bees, wasps, flies, and beetles.
Triangulate orbweaver |
Another
spider seen today was a very tiny Triangulate
orbweaver, identifiable only because it has a light colored, triangular mark
on its abodmen.
Angeli netted
a Silver spotted skipper, a common
species whose larvae feed on False Indigo and other legumes. Skippers differ
from butterflies in having very stout bodies and antennae with a hook on the
end. (Butterflies have antennae the end with a swelling, but no hook.)
Bee fly, proboscis sticking out to the left |
One of the
most unusual insects seen today was a Bee
fly, a true fly, meaning that it has only a single pair of wings. Bee flies
are very fuzzy, which makes them resemble bees, but they are much more adept
fliers that bees. They can hover and fly forward and back, just like
hummingbirds. Projecting forward from the head is a long proboscis which they
insert into to get nectar, again like hummingbirds. They are also important
pollinators, transferring pollen from flower to flower that they pick up while
sipping nectar.
Brown marmorated stink bug |
Other
insects encountered: Brown marmorated
stink bug, a brown moth and, possibly, a Tortoise beetle. The stink bug is a non-native pest of agricultural
crops. The tortoise beetle is so named because it is shaped somewhat like a
turtle and is able to squat down with its legs withdrawn under its wing cover
edges, adding to the similarity with a turtle.
Birds
Mississippi kite |
A Mississippi kite was spotted on a dead
tree on the west edge of the power line RoW. Kites feed on airborn insects and
have also been known to take birds while in the air.
Red shouldered hawk |
Our old,
familiar Red shouldered hawk also made
an appearance today.
Plants
Daisy fleabane |
Daisy fleabane leaves |
Rough daisy fleabane |
Rough daisy fleabane leaves |
Daisy fleabane has begun to
bloom. There are several different fleabanes and they are difficult to
identify. Don took some photos of the leaves, as well as the flowers, of the
daisy fleabane and the rough daisy fleabane that was blooming earlier. The
rough DF has narrower leaves with smooth margins, whereas the DF has broader,
toothed leaves.
A
non-native, but not invasive plant, Brazilian verbain poked its tiny purple
flowers above the other plants in the power line RoW.
Wild onion |
Wild onions
were seen, with its purple heads and flowers
The Garden
and the local Audubon Society have sponsored an effort to reestablish our
native River cane, a plant that once
covered the river bottoms of many southern rivers and streams. Many of the
plantings made earlier this year have been successful and some are towering
over our heads.
Green ash with abundant fruits |
A Green ash on the west side of the RoW
is loaded with fruit, as is one near the river.
Bottlebrush buckeye; each inflorescence contains hundreds of flowers |
Bottle brush
buckeyes are blooming all over the Garden. Three can be seen in the rain garden
to your right as you come in the entrance road, past the speed bump. One is
flowering in the Shade Garden next to the sidewalk near the White Trail
entrance and one more in the formal garden just after crossing the flower
bridge.
SUMMARY
OF OBSERVED SPECIES:
Hentz's orbweaver
|
Neoscona crucifera
|
Passionflower
|
Passiflora
incarnata
|
Passionflower
flea beetle
|
Disonycha
sp.
|
Yellow
crownbeard
|
Verbesina
occidentalis
|
Wingstem
|
Verbesina
alternifolia
|
White
crownbeard/Frostweed
|
Verbesina
virginica
|
Grasshopper
|
Orthoptera:
Acrididae
|
Japanese
beetle
|
Popillia
japonica
|
Silvery
checkerspot (caterpillar)
|
Chlosyne
nycteis
|
Tree
cricket
|
Oecanthus
sp.
|
Eastern
Spadefoot
|
Scaphiopus holbrookii
|
Wild
petunia
|
Ruellia
caroliniensis
|
Goldenrod
Bunch Gall
|
Rhopalomyia
solidaginis
|
Meadow katydid
|
Family
Tettigoniidae
|
Daisy
fleabane
|
Erigeron
annuus
|
Brazilian
verbain
|
Verbena
brasiliensis
|
Wild
onion
|
Alium sp.
|
Two-lined
spittlebug (adult)
|
Prosapia
bicincta
|
Lady
beetle (larva)
|
Family
Coccinellidae
|
Triangulate
orbweaver
|
Verrucosa
arenata
|
Silver
spotted skipper
|
Epargyreus
clarus
|
Bee fly
|
Family
Bombyliidae
|
Brown
marmorated stink bug
|
Halyomorpha
halys
|
Moth
|
Family
Noctuoidea
|
River
cane
|
Arundinaria
gigantea
|
Bottlebrush
buckeye
|
Aesculus
parviflora
|