BIOLOGICAL COMMUNITIES

(continued)

Plants of marginal ecotones or isolated patches where deeper soil has accumulated include Acer leucoderme Small, Asclepias verticillata L., Berchemia scandens (Hill) K. Koch, Bignonia capreolata L., Blephilia ciliata (Pursh) Benth., Carex eburnea Boott, Carya pallida (Ashe) Engl. & Graebn.,

Celtis tenuifolia Nutt., Cercis canadensis L., Croton alabamensis var. alabamensis, Delphinium carolinianum Walt. ssp. carolinianum, Echinacea purpurea (L.) Moench, Fleischmannia incarnata (Walt.) King & H. E. Robins., Forestiera ligustrina (Michx.) Poir.,

Frangula caroliniana (Walt.) Gray, Heliopsis helianthoides (L.) Sweet var. gracilis (Nutt.) Gandhi & Thomas, Hypericum frondosum Michx., Ipomopsis rubra (L.) Wherry, Juniperus virginiana, Lithospermum canescens (Michx.) Lehm.,

Oligoneuron rigidum (L.) Small, Phlox amoena Sims ssp. amoena, Pinus echinata P. Mill., P. palustris, P. taeda L., Quercus muehlenbergii,

Rhus aromatica Ait., R. copallinum L., Salvia lyrata L., S. urticifolia L., Scutellaria alabamensis Alexander, S. incana Biehler var. punctata (Chapman) C. Mohr, Sida elliottii Torr. & Gray, Sideroxylon lycioides L.,

Silene regia Sims, Solanum pumilum Dunal, Symphyotrichum laeve (L.) A. & D. Löve var. concinnum (Willd.) Nesom, S. patens (Ait.) Nesom, S. shortii (Lindl.) Nesom, Thaspium barbinode (Michx.) Nutt. var. chapmanii Coult. & Rose, Toxicodendron radicans (L.) O. Ktze., and Viola walteri House.

A lichen, Psora rubiformis (Ach.) Hooker vel aff., and several ferns are mostly restricted to exposed rocks, usually elevated above the surrounding surface: Asplenium resiliens Kunze, Cheilanthes alabamensis (Buckl.) Kunze, C. lanosa (Michx.) D. C. Eat., and Pellaea atropurpurea (L.) Link. Weathered Ketona Dolomite is dark gray in color, due to one or more unidentified crustose lichens.