Noteworthy Collections: Mississippi and Louisiana (77-2)

Author : Mac H. Alford

Bidens alba (L.) DC. var. radiata (Sch. Bip.) R. E. Ballard in T. E. Melchert (ASTERACEAE)— LOUISIANA, Orleans Parish: New Orleans, ruderal areas along sidewalk next to gas station… Ceratopteris thalictroides (L.) Brongn. (PARKERIACEAE)— MISSISSIPPI, Jackson County: Whiskey Bayou of the Pascagoula River basin, W of Escatawpa, semiattached to a mostly submerged and rotten log in bayou… …


Noteworthy Collections: Pennsylvania

Author : Jerry G. Chmielewski

Leucojum aestivum L. (AMARYLLIDACEAE)— PENNSYLVANIA, Crawford County: Meadville


Scientific Note: Diarrhena obovata in the Potomac River Watershed: A New Invader?

Author : Chris Lea

Diarrhena obovata (Gleason) Brandenburg is a woodland grass primarily of the central United States in the Mississippi River drainage (Brandenburg et al. 1991). Isolated occurrences of D. obovata in the Appalachian and Piedmont regions of the mid-Atlantic states have been found in the last several decades, and the species is or has been considered to …


Floral Colonization of a Free-Water Surface Constructed Wetland System in Grady County, Georgia

Author : Sarah A. White

Additional Authors : Milton D. Taylor, Dixie Z. Damrel,

ABSTRACT A comprehensive survey of the vascular flora of a constructed wetland in Grady County, Georgia was conducted at monthly intervals between August 2004 and May 2006. The constructed wetland is used as a part of a nutrient remediation system to improve the sustainability of plant nursery water-handling practices. The survey evaluated vegetation in a …


Scientific Note: Addendum to a Calculation of Expected Plant Frequency

Author : Steven R. Helm

This addendum to Helm (2010) describes an additional condition to be met when converting and comparing frequencies of randomly distributed plants. Density (number of plants of interest per sample plot area) and frequency (fraction of sample plots with presence of a plant of interest, expressed per sample plot area) can be influenced by plot edge …


Reintroduction of Federally Endangered Harperella (Harperella nodosum Rose) in Flood- Prone, Artificial, and Natural Habitats

Author : Elizabeth Fortson Wells

ABSTRACT Harperella (Harperella nodosum) is the only federally listed endangered plant species in the Chesapeake and Ohio Canal National Historical Park (C&O Canal NHP) in the National Park Service in Maryland and one of four federally listed endangered plant species in West Virginia. This paper contrasts unsuccessful and successful efforts to reintroduce harperella seedlings in …


Soil Factors in Three Populations of Endangered Golden Sedge (Carex lutea LeBlond)

Author : John B. Taggart

Additional Authors : Zachary T. Long

ABSTRACT Three sites with populations of federally endangered golden sedge (Carex lutea LeBlond) were sampled to investigate whether circumneutral soil conditions were associated with a species distribution restricted to 208 km2 within two adjacent counties of the lower North Carolina Coastal Plain. Populations were selected to include different soil series found in a stateowned natural …


Influences of Hemlock Woolly Adelgid–Induced Stand-Level Mortality on Nitrogen Cycling and Stream Water Nitrogen Concentrations in Southern Pennsylvania

Author : Jason F. Cessna

Additional Authors : Caroline Nielsen

ABSTRACT Hemlock woolly adelgid, Adelges tsugae, is spreading throughout the northeastern United States, causing large-scale dieback of the eastern hemlock, Tsuga canadensis. This study examined soil nitrogen transformations and stream water nitrogen content at five hemlock-dominated stands in southern Pennsylvania, spanning a spectrum of hemlock mortality, from no mortality to total A. tsugae–induced mortality with …


Phylogeny and Phylogeography of North American Castanea Mill. (Fagaceae) Using cpDNA Suggests Gene Sharing in the Southern Appalachians (Castanea Mill., Fagaceae)

Author : Joey Shaw

Additional Authors : J. Hill Craddock Meagan A. Binkley

ABSTRACT North American Castanea consists of three morphologically variable species: Castanea dentata, Castanea pumila, and Castanea ozarkensis. Taxonomy of these species has been complicated by intermediate morphology, similarity in growth habit due, in part, to the chestnut blight, and putative naturally occurring hybridization in the southern Appalachians. The primary goal of this study was to …