P A G E 12
S E P T — O C T 2 0 0 7
Exploring a Piedmont Cliff Community Kathy Schlosser
Photos courtesy of Mimi Westervelt
The opposite, southwest facing bank
has deep, rich soil and a plant commu-
nity that includes Euonymus ameri-
cana, Smilax spp., Aplectrum hy-
menale, Botrychium virginianum, Chi-
maphila maculata, Geranium macula-
tum, Goodyera pubescens, Hepatica
americana, Sanguinaria canadensis,
and Uvularia perfoliata.
Primarily a beech-maple-hickory for-
est, there are also tulip poplar, paw-
paw, and spicebush. This site was
first inventoried ten years ago by the
Natural Heritage Program. Since that
time, the canopy has closed a bit, and
this fall the area is very dry. Ordinar-
ily, there is a small stream at the foot
of the cliff that keeps the liverworts
happy—on our most recent visit, they
were gasping for water.
Recent studies of cliff sites have re-
vealed that some trees growing on
cliffs are surprisingly ancient, some
hundreds of years old. Intact natural
communities, even those in the midst
of developed urban areas, can still be
found and are fascinating sites to
study. We need only take a little
time to look for them.
A complete plant list is available. If
interested, contact the editor.
I
n the Piedmont of North Carolina are
scattered acidic cliff plant communi-
ties, often defined by moss covered
boulders and an open tree canopy. Ac-
cording to Schafale and Weakley (1990),
acidic cliffs are ―very steep to vertical
slopes [greater than 60 degrees] on
acidic rock or saprolite…[slopes] steep,
rocky, or dry enough to prevent forma-
tion of a closed tree canopy.‖
Rock cliff communities can be acidic,
circumneutral, or calcareous (alkaline).
Acidic rock cliff communities are the
least diverse of the group, and have the
fewest specialized plant species. The
bedrock yields little or no calcium and is
acidic in reaction. They support species
of dry, low nutrient plants from the sur-
rounding forests, such as Virginia
creeper (Parthenocissus quinquefolia),
and common polypody (Polypodium
virginianum),
Members of the Triad Chapter have
been watching such a site, visiting at
different times of the year. This particu-
lar cliff is a narrow ravine with granite
boulders on the northeast facing wall
reaching about twenty feet in height.
The steep wall supports a community of
Actea racemosa, Heuchera americana,
Adiantum pedatum, Dennstaedtia puncti-
lobula, and Polystichum acrostichoides.
Hydrangea arborescens grows in abun-
dance. The bottom two to three feet of
the cliff is moist and supports a large
colony of mosses and liverworts.