ABSTRACT
Fifty-six phytoplankters were found in a temporary standing water site which existed over a five-month period. A seasonal succession of species was noted from winter into late spring with diatoms, chrysophyceans, and chlorophyceans the major components.
ABSTRACT
The South Mountains form an isolated mountain range in the upper Piedmont of western North Carolina. The basic inventory of the vascular plant species and description of the vegetation types in the South Mountains State Park were completed from March 1975 to September 1976. Collections during this period resulted in 446 species and varieties, about 23% of which were new county records. Vegetation types include: river flood zone, mixed mesophytic, mixed deciduous-white pine, oak-pine, pine, and disturbed areas, most of which are correlated primarily with a topographic moisture gradient. Physical characterization of the area, floristic affinities of the vegetation, endangered and threatened species recorded, and natural area recommendations are discussed.
ABSTRACT
Floristic data and county dot distribution maps are presented for the 23 taxa of Chenopodiaceae definitely recorded from Ohio. Several questionable determinations are also discussed. Because of difficulties in identification of some Chenopodiaceae, generic, specific and varietal keys are included.
ABSTRACT
Four species of the Santalaceae occur in Virginia: Buckleya distichophylla, Comandra umbellata, Nestronia umbellula, and Pyrularia pubera. Buckleya is now known from five counties. A key to and description of each species is given and aspects of biology, especially morphology and parasitism, discussed.
ABSTRACT
The following species of Orobanchaceae occur in Virginia: Conopholis americana, Epifagus virginiana, Orobanche uniflora, O. ludoviciana, and O. minor. Orobanche ludoviciana, known from only three collections, has previously been unrecorded for the state and is probably now extinct in Virginia. Orobanche minor, an European weed, has occasionally been introduced and is the only member of the genus that attacks plants of agronomic importance. Description of each species with notes on parasitism, distribution, and floral biology are included.
ABSTRACT
Twelve natural populations of ginseng (Panax quinquefolium L.) located in four of the major physiographic provinces in Arkansas were studied. Soil samples were analyzed for the major nutrients, pH, percent organic matter and texture. The typical soil on which the populations were found would be classified as a moderately acid clay soil with moderate to high fertility. A typical topographic position would be a gentle to moderately steep, well-drained midslope with a northeastern exposure.
ABSTRACT
The cutting, burning and ditching of a very large pocosin in southeastern North Carolina for the purpose of silviculture afforded the opportunity to observe the response of three species of Sarracenia growing in the dense brush. Prior to disturbance (the last fire was some twenty years previously), pitcher plants were growing poorly but maintained a presence. Subsequent to clearing, the immediate effects of increased light and decreased aerial competition became apparent with an exuberant growth release wherein the Sarracenias became dominant and there was an increase in seedling activity. The effects of ditching lagged and the soil did not begin to dry for one to two years after clearing at which time Sarracenias promptly decreased, even though shrub sprouting had not recurred sufficiently to provide significant competition. The events in this pocosin are compared to reports of savanna burnings, and the possible significance of burning the cut brush of the pocosin after drying is discussed along with various previous and current soil analyses. It is concluded that the effects of mechanical clearing followed by decreasing hydration were probably the most important factors involved in Sarracenia reaction.
Book Review: John Bartram: Traveling Botanist
ABSTRACT
Clematis verticillaris, Corylus cornuta, Leptochloa uninervia, Lycopus amplectens, and Rosa acicularis are reported from Illinois for the first time. Recent collections for seven seldom encountered vascular plants are also cited.
ABSTRACT
Analysis of vegetation survey plots from the western end of Great Smoky Mountains National Park showed wild boar (Sus scrofa) rooting to be present at all elevations but tending to be concentrated in mesic sites, with the exception of those with Rhododendron maximum understories. Yellow pine and hemlock dominated stands were much less intensively utilized than hardwood and oak mixtures. Hogs disturbed wet areas in Cades Cove which are known habitats for rare herbs. During the poor acorn year of 1978-79, beech forests were intensively utilized in the winter. Recovery in previously hog-rooted exclosure plots was greatest in their first year. Herbaceous cover for some of the exclosure plots was within normal range within three years. Species number, however, remained less than expected.