Noteworthy Collections: North Carolina and Tennessee
Noteworthy Collections: North Carolina and Tennessee
Noteworthy Collections: North Carolina and Tennessee
Scientific Notes: The Status of the Binomial <em>Sesbania macrocarpa</em> Muhl. (Leguminosae)
Scientific Notes: The Case of <em>Cotinus obovatus</em> Raf. (Anacardiaceae) in Kentucky
ABSTRACT Foliar flavonoid profiles permit discrimination between <em>Fraxinus americana</em> and <em>F. pennsylvanica</em> and the identification of the ploidy level in the former species. Gender cannot be ascertained by foliar flavonoid complement for either species.
ABSTRACT In contrast to dehiscence progressing from the apex which is characteristic of other <em>Sarracenia</em> species, capsule dehiscence in <em>S. leucophylla</em> progresses from the base. It is proposed that this adaptation allows seed release at a point where seeds are less likely to be caught by the adherent style disc. Post-anthesis tilting in <em>Sarracenia</em> flowers seems to function to move the style disc away from its ventral position where it could interfere with seed dispersal.
ABSTRACT The Clinch River gorge area of Russell County, Virginia, contains several species of biogeographic interest. At or near the southeastern extent of their ranges are <em>Sullivantia sullivantii</em>, <em>Campanula rotundifolia</em>, <em>Galium boreale</em>, <em>Rhynchospora capillacea</em>, <em>Paxistima canbyi</em>, <em>Apocynum sibiricum</em>, <em>Euphorbia purpurea</em>, <em>Deschampsia caespitosa</em>, and <em>Fraxinus nigra</em>. At or near the northeastern extent are <em>Lithospermum tuberosum</em> and <em>Viola walteri</em>. Several other unusual species occur here. Details of physiography and habitats are given.
ABSTRACT An inventory of the vascular flora of nine of eleven units of Richmond National Battlefield Park was compiled from 1985 to 1987. Each site was visited during the growing season in two to four week intervals; plant species were identified and recorded in the field and/or collected for later study. A total of 761 different species were identified in the surveyed units, and 2487 individual records of species per particular park unit were noted. Twenty-three percent of the flora consists of exotic species, largely from Eurasia. Voucher specimens are housed in the herbaria of the University of Richmond and Virginia Commonwealth University.
ABSTRACT We present here a comprehensive list of 331 algal taxa (phytoplankton and littoral) reported from Mountain Lake since 1930. The total derived from 11 earlier investigations, Jervis, and our continuous 33-month (1985-87) study includes Chlorophyceae (54%), Cyanophyceae (13.8%), Bacillariophyceae (7.5%), Dinophyceae (7.0%), Chrysophyceae (6.0%), Euglenophyceae (4.9%), Cryptophyceae (4.0%), Charophyceae (1.5%), Xanthophyceae (1.0%), and Chloromonadophyceae (0.3%).
ABSTRACT A population of Cleistes <em>divaricata</em> (L.) Ames var. <em>bifaria</em> Fernald, at its northwesternmost range limit and rare in West Virginia, more than quadrupled in numbers between 1980 and 1986 in an acidic, nutrient-deficient West Virginia meadow that is mowed annually. The aerial, upright ramicauls (stems) may be vegetative with one to three leaves; when flowering, they typically bear one flower, one cauline leaf, and a floral bract. Long-lived flowers exploit naive bees, operating as rewardless bee-food-flower mimics. A hinged anther drops clumps of pollen tetrads onto the dorsal thorax of <em>Bombus</em> and <em>Megachile</em> workers. Pollination is effected when bees deposit pollen in flowers visited subsequently. Field capsules with 120 to 11,000+ seeds result from xenogamous and geitonogamous pollinations. Scarcity of pollinators and occasional severe herbivory of flowers and capsules lower reproductive output. Reproduction is enhanced by production of healthy pollen, low pollen to seed ratio, a highly efficient pollination