Invasion of Custucta indecora Choisy (Convolvulaceae) in a Tidal Brackish Water Marsh in Virginia
Scientific Notes: Observations on Insect Use of Chinese Tallow [Sapium sebiferum (L.) Roxb.] in Louisiana and Texas
ABSTRACT Chromosome counts from 44 populations, representing four species of Chelone from throughout its range in eastern North America, are reported for the first time and counts from six populations examined by other researchers are discussed. Chromosome number determinations in Chelone generally agree with those of previous work and suggest a base number of x = 14 and an euploid series: C. cuthbertii, C. glabra, and C. lyonii are 2n = 28; C. obliqua populations in the southern Blue Ridge are 2n = 4x = 56; whereas C. obliqua populations from elsewhere are 2n = 6x = 84. The taxonomy of species, distribution of chromosome races, and cytotypes are discussed.
ABSTRACT A new species, Echinodorus floridanus, from extreme western panhandle Florida, USA is described, and characteristics to separate it from the other species of Echinodorus are discussed. The new species is known only from the type locality.
ABSTRACT This paper presents a list of 41 Carex taxa vouchered for the Buffalo National River in north central Arkansas, a list of 23 Carex taxa considered as possible additions, and briefly discusses potential for un- described taxa. The total (64) compares with 59 taxa known for Baxter County, Arkansas, an adjoining county the author collected extensively, and with 122 Carex taxa listed for Arkansas.
ABSTRACT A status survey to determine population size and describe community structure was conducted during 1995 at each of seven sites where Dirca palustris (leatherwood) has been known to grow in South Carolina. Populations ranged in size from eleven to over 400 plants with a typical population size being about 100 plants. Vegetation analyses using transect lines throughout the population were used to determine the importance values of tree species. The surveyed populations were located in mesic mixed forests where Pinus taeda (loblolly pine) and Liquidambar styraciflua (sweetgum) were prevalent. Plants grew along stream floodplains and levees in well drained sandy to sandy loam soils which were slightly acidic.
ABSTRACT Nestronia umbellula Raf. (Santalaceae) is reported from Kentucky for the first time. The Wayne County site is approximately 200 km north of the nearest known site. Site information is given and speculation raised about the possible role of native Americans as dispersal agents for this species.