ABSTRACT The cedar glade endemic <em>Viola egglestonii</em> is reported for the first time from Indiana, eastern Tennessee and two additional counties in Kentucky. In Indiana, the species grows on a Paleozoic (shaley) limestone glade in Harrison County in the Interior Low Plateaus Physiographic Province, in eastern Tennessee it occurs on Paleozoic limestone glades in Hamilton and Meigs counties in the Ridge and Valley Physiographic Province and in Kentucky the new records of occurrence are for limestone glades in Jefferson and Hardin counties in the Interior Low Plateaus Physiographic Province.
ABSTRACT <em>Lepuropetalon spathulatum</em> (Saxifragaceae), a minute and little-known winter annual native to the southeastern and south-central United States, has been found within the state of Florida. This discovery extends the range into all the southeastern coastal plain states. The species, hitherto assumed rare, is now known from 130 counties, from southeastern North Carolina to eastern Texas and southeastern Oklahoma. A map is provided. Apparent frequency is much higher in the south-central states where collectors have been active. The suggestion is made that examination of suitable habitats in the early spring would disclose a greater abundance of this plant than has previously been suspected.
ABSTRACT In the most recent monographic study of the decurrent-leaved species of <em>Helenium</em>, Rock treated <em>H. virginicum</em> Blake, and the varieties of <em>H. autumnale</em> L., as a single species complex. Rock based this treatment on the apparent continuity of variation within the complex and his uncertainty as to the basis of this variation. To begin to determine if reported differences between <em>H. virginicum</em> and <em>H. autumnale</em> are genetic or phenecotypic, an experimental garden comparison of <em>H. virginicum</em> with <em>H. autumnale</em> var. <em>parviflorum</em> (Nutt.) Fern. was undertaken. Genetically based differences between these taxa were found in height, bolting date, blooming period, cauline leaf morphology and abundance, pappus length, and length of basal leaves during flowering. The presence or absence of basal leaves during flowering was found not to be a good distinguishing character. Field observations suggest that <em>H. virginicum</em> and <em>H. autumnale</em> var. <em>parviflorum</em> are ecologically isolated.
ABSTRACT Popcorn disease, known to be caused by <em>Ciboria carunculoides</em> (Siegler and Jenkins) Whetzel, was observed on a single white mulberry tree (<em>Morus alba</em> L.) growing in south central Kentucky. The disease was not found on other white or red (<em>Morus rubra</em> L.) mulberries growing nearby. Diseased fruits were significantly (P<0.01) heavier, longer, and wider than normal fruits. On the lower branches, approximately one-half of the berries were diseased, whereas the proportion of diseased fruits de- creased in the higher branches.
ABSTRACT The Blackwater Ecologic Preserve includes the northernmost stand of <em>Pinus palustris</em> in the United States as well as several associated species unique in Virginia. The following two relict pyrophytic communities are recognized: <em>Pinus palustris</em>/<em>Quercus laevis</em>/mixed ericads on a sand ridge and <em>Pinus serotina</em>/<em>Pinus serotina-Quercus</em> <em>laevis</em>/mixed ericads or <em>Pyxidanthera barbulata</em> on a moist sand flat. Other communities include a mixed oak-pine slope, a black gum swamp, a river bluff, and an alluvial flat. Vegetation analyses of each community are presented. The history of botanical exploration, presettlement vegetation of the area, and importance of <em>Pinus palustris</em> in Virginia are discussed.
ABSTRACT Vegetation and soil characteristics of five, steeply sloped sandstone glades located in Devil’s Den State Park, Arkansas were surveyed. Soil factors were similar to those of other glade types reported in the literature. Mean soil depth was 5.2 cm, and 90% of all soil depth measurements were <10 cm. <em>Quercus stellata</em> and <em>Juniperius virginiana</em> were the most common tree species, and mean basal area for all trees was only 3.6 m2ha-1. <em>Schizachyrium scoparium</em> was a dominant species on all five glades. <em>Coreopis palmata</em>, <em>Aristida dichotoma</em>, and <em>Helianthus hirsutus</em> were co-dominants on one glade each; grasses comprised 46% of herbaceous vegetation.