Sunday, September 21, 2014

Falling Into the Coastal Plain



Recently I participated in a field trip to the Fall Line Sandhills Wildlife Management Area (WMA) near Butler, GA in Taylor County. The area has only recently become a WMA; it was purchased in 2006 from a timber company. You may have heard the term “fall line” before when reading about some of Georgia’s physiological characteristics. I couldn’t describe it any better than this DNR page on the WMA:

The name Fall Line Sandhills comes from the tract's transitional location and predominate upland habitat. The Fall Line is the boundary between the crystalline bedrock of the Piedmont physiographic province just to the north and the sedimentary conditions of the Coastal Plain province found here. As streams flow across this boundary, they more readily erode the sandy Coastal Plain side, creating cascades at the transition. When strung together across the state and beyond, these cascades, or falls, create a fall line.
This transition coincides with the shoreline of ancient seas and just below it are remnant beach dunes. Today, these landlocked dunes have unique plant and animal communities on deep sandy soils characterized by ecologists as sandhills. Many Coastal Plain plants and animals are very dependent on this habitat type.



As we gathered at our first stop on the field trip, our DNR guides encouraged us to look around and imagine an ancient sea lapping the shore in the distance. The sandhill shapes were clear, and a few of the remaining timber pines (loblolly and sand pines) were present; but other areas had been cleared manually and with fire. The cleared areas were the ones we wanted to see for there we would find thriving populations of unique Coastal Plain wildflowers.

Liatris elegans
Stylisma patens




















In this first spot we found plants like elegant blazing star (Liatris elegans) and the Coastal Plain dawnflower (Stylisma patens); the dawnflower's heritage in the morning glory family was evident. I thought it was a tiny morning glory at first (what a tiny flower, look at those grains of sand next to it).

Pityopsis pinifolia
 We were pleased to find in bloom the sandhill goldenaster  (Pityopsis pinifolia) and Carolina pineland cress (Warea cuneifolia). Several of us crushed the foliage of the aromatic orangegrass (Hypericum gentianoides) to get the experience of exploring plants from several senses. The goldenaster's foliage was pine-like. 

Warea cuneifolia

Also there were familiar plants from the Piedmont like the thoroughworts (Eupatorium spp.), anise-scented goldenrod (Solidago odora) and winged sumac (Rhus copallinum).  More new-to-us blooming plants included blacksenna (Seymeria pectinata) and sandhill jointweed (Polygonella fimbriata), pictured later.

Agalinis fasciculata

We walked a bit to get to a naturally low area that is supporting moisture loving plants like inkberry (Ilex glabra), purple foxglove (Agalinis fasciculata), blue lobelia (Lobelia puberula perhaps), oaks and pines and way too much poison oak (Toxicodendron pubescens) for my liking (but I know wildlife likes it).  


Our guides talked about the bird species that they have observed returning to the area thanks to their work restoring the natural communities - birds such as Bachman’s sparrow. Frogs and other amphibians are coming back as well. The old “build it and they will come” story is still true, I guess. Of course, this is more of an “un” building effort as they work to remove what should not be here.

 It was all so exciting that I barely noticed what trees and shrubs were there! That is not normal for me.
Lindera melissifolia

Next we drove to another wet area that supports a recovering population of pondberry (Lindera melissifolia). Most of us are more familiar with the related spicebush (Lindera benzoin). The more colonial (growing by stems) pondberry has suffered from habitat loss. A crushed leaf has a faint spicy scent like L. benzoin but the pondberry fruit seems larger and it was in perfect form that day.

The soil beneath it was thick with sphagnum moss. Dragonflies were abundant and birds called in the distance. It was a beautiful and peaceful area.

Helianthus longifolius




Nearby Black Creek WMA was our next stop and there we found so many more new plants. Especially abundant was longleaf sunflower (Helianthus longifolius). Our leader pointed out that one distinguishing characteristic for this species is the presence of basal leaves (at ground level). 

Eriogonum tomentosum

On the other side of the road several plants called out to us with pink-tinged creamy blossoms; it was sandhill wild-buckwheat (Eriogonum tomentosum). We also found Yucca filamentosa festooned with curling filaments, purple ironweed (Vernonia angustifolia), more sandhill jointweed (Polygonella), Eastern greeneyes (Berlandiera pumila) and the semi-parasitic southern oak leach or false foxglove (Aureolaria pectinata). They all appeared to be growing in pure sand so clearly these plants have adapted to these conditions. So perfectly suited to this place.

Yucca filamentosa
Aureolaria pectinata


Berlandiera pumila


















Polygonella fimbriata














Rhexia petiolata


We followed a path through scrub, past more sunflowers and the occasional blazing star (Liatris tenuifolia), enjoying the day with the sound of cows mooing just over the band of trees that separated us from a pasture.

We came to a low wet spot with special plants.  Sundews (Drosera capillaris) were sprinkled among fringed meadowbeauty (Rhexia petiolata) and bog cheetos (Polygala lutea). Orchids were past blooming but exciting to see.

Chrysopsis gossypina


Polygala lutea

From there we were off again in the cars, hoping against the approaching rain, to find a few more special things. We did find a gopher tortoise burrow and blooming cottonleaf goldenaster (Chrysopsis gossypina) but then the rain came and we packed up.
 

Click on any picture to get to a slideshow of full size pictures.