ABSTRACT Thirty-eight taxa are reported: One is new to the southeastern United States, fourteen are reported for the Carolinas and the remainder are new for South Carolina.
ABSTRACT A survey of the vascular flora of Crittenden County Arkansas, located on the eastern border of Arkansas across the Mississippi River from Memphis, Tennessee, and intensely cultivated, revealed a total of 523 species and 93 families. The largest family was the Gramineae with 40 genera and 79 species; next was the Compositae with 31 genera and 45 species. The Cyperaceae was third with 6 genera and 32 species, followed by the Fabaceae with 16 genera and 30 species.
ABSTRACT Vegetational succession following fire in mature eastern hemlock-mixed mesophytic forests is not well documented. Some qualitative descriptions do exist (Braun, 1950) but little quantitative information is available. Although primary and secondary succession following disturbance by man are generally well understood (i.e. logging, strip mining, agriculture, etc.), our knowledge of succession in virgin forests is limited. Secondary succession following a spatially limited, but moderately severe fire on a virgin mesic ravine slope community in eastern Kentucky is discussed. The vegetational structure, as it exists forty-seven years after the fire, is described quantitatively.
ABSTRACT <em>Dryopteris celsa</em> (Log fern) and related species in Louisiana are discussed. <em>Dryopteris celsa</em> is reported for the first time from Louisiana and a list of its most common associates is included.
ABSTRACT Acceptance of Hack’s Equilibrium Concept of Landscape would eliminate the erosion-cycles peneplanation idea as an explanation of coastal plain-mountain disjunct patterns of plant distribution in eastern North America. Palynological and other paleobotanical evidences point to the interplay of Cenozoic climate fluctuations, the changing landscape, and barriers which these phenomena form, as primary causes of these disjunct patterns.
ABSTRACT A re-evaluation of Rafinesque’s work in Kentucky was undertaken in order to give courses on Local Flora (Field Botany) more of a historical background. It appears that many of the type localities of species described by Rafinesque still exist in unchanged state especially along the Kentucky River, however the barrens once rich in species of gentians have now virtually disappeared. Rafinesque also gave good attention to introduced weeds. His first list of Kentucky plants was very incomplete but still worthwhile to study.
ABSTRACT The plant communities of Great Falls National Park, Fairfax County, Virginia, are described. Special attention is drawn to the habitat diversity represented, and the rocky slope-bedrock terrace community, which is found nowhere else in the county, is emphasized. An annotated list of vascular flora, which has been compiled from collections made from September, 1970 to May, 1972, is included. One hundred thirteen families with 640 taxa on the species or variety level are represented. Many species heretofore not reported from the county are reported.
ABSTRACT A total of 1,064 herbarium specimens of Cruciferae present at West Virginia University herbarium (WVA), as of January 1971, were examined. These specimens represent 29 genera, 61 species, and one variety, a list of which is included in this paper. A discussion of new information resulting from this study falls into four categories: 1) eight taxa [<em>Iberis amara</em> (L.) DC., <em>Isatis tinctoria</em> L., <em>Capsella rubella</em> Reut., <em>Eruca sativa</em> Mill., <em>Descurainia sophia</em> (L.) Webb, <em>Cardamine clemnatitis</em> Shuttlew., <em>Cardamine impatiens</em> L., and <em>Sibara virginica</em> (L.) Rollins] not reported for West Virginia in “Flora of West Virginia,” Edition I (Strausbaugh and Core, 1953), 2) two taxa [<em>Erucastrum gallicum</em> (Willd.) 0. E. Schulz and <em>Descurainia pinnata</em> var. <em>brachycarpa</em> (Richards.) Fern.] previously known in West Virginia from literature, but now represented by specimens at WVA, 3) one taxon [<em>Diplotaxis muralis</em> (L.) DC.] deleted because of a previously mis-identified specimen, and 4) new county records
ABSTRACT Henry A. Gleason states, of <em>Monarda media</em> (New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada 3: 170), that “it has been suggested that the species has arisen by hybridization of <em>M. didyma</em> and <em>M. fistulosa</em>.” <em>Monarda</em> was originally absent from Aton Forest, a research natural area in northwestern Connecticut. Studies beginning in 1947, involving the introduction of both putative parents and observations on five subsequently appearing volunteer clones each different but of intermediate characteristics, have clearly confirmed the hybrid nature of <em>Monarda</em> media.