A5056913972- Botany and Plant Ecology Studies
- Bryophyte Studies and Records
- Botany, Ecology, and Taxonomy Studies
- Lichen and fungal ecology
- Plant Diversity and Evolution
- Plant and animal studies
- Ecology and Vegetation Dynamics Studies
- Forest ecology and management
- Plant Pathogens and Fungal Diseases
- Sesquiterpenes and Asteraceae Studies
- Yeasts and Rust Fungi Studies
- Plant Taxonomy and Phylogenetics
- Fern and Epiphyte Biology
- Banana Cultivation and Research
- Species Distribution and Climate Change
- Genetic diversity and population structure
- Plant and Fungal Interactions Research
- Mycorrhizal Fungi and Plant Interactions
- Archaeology and Natural History
- Rangeland and Wildlife Management
- Botanical Research and Applications
- Plant and Fungal Species Descriptions
- Forest Insect Ecology and Management
- Bioenergy crop production and management
- Horticultural and Viticultural Research
Morton Arboretum
2023
U.S. National Arboretum
2008-2022
United States Department of Agriculture
2009-2020
Agricultural Research Service
2019-2020
Missouri Botanical Garden
1993-2001
Washington University in St. Louis
1988-1991
The University of Texas at Austin
1985-1988
Variation of chloroplast DNA and nuclear ribosomal (DNA encoding RNA) was studied for five species white oak native to the eastern United States. Although these differ in many morphological characters have different (though overlapping) geographical ranges ecological tolerances, they are interfertile often grow mixed stands, hybrids occasionally found nature. All individuals were morphologically typical members their respective species-i.e., showed no evidence recent hybrid ancestry....
Summary Leaf out phenology affects a wide variety of ecosystem processes and ecological interactions will take on added significance as leaf times increasingly shift in response to warming temperatures associated with climate change. There is, however, relatively little information available the factors affecting species differences phenology. An international team researchers from eight Northern Hemisphere temperate botanical gardens recorded dates c . 1600 woody 2011 2012. differed by much...
The eastern North American white oaks, a complex of approximately 16 potentially interbreeding species, have become classic model for studying the genetic nature species in syngameon. Genetic work over past two decades has demonstrated reality oak but gene flow between sympatric oaks raises question whether there are conserved regions genome that define species. Does homogenize entire genome? Do distinguish one part its range differ from it other parts range, where grows sympatry...
Exotic diseases are threatening many North American tree species, and management of requires understanding the biology host as well pathogen. Ulmus americana is a widespread dominant eastern America that has been widely planted an ornamental shade tree. Populations species have suffered heavy mortality from Dutch elm disease, caused by introduced fungus. generally reported to be tetraploid, but discovery triploid trees in cultivation suggested lower ploidy levels may exist wild, so was...
The Dicranaceae have been classified as one of the largest, most heterogeneous families moss subclass Dicranidae. Circumscriptions family varied, with some studies excluding selected subfamilies and recognizing them at familial rank, whereas others retained a broader concept. As well, classifications varied in their generic circumscriptions subfamilies. Chloroplast DNA sequence data (trnL (UAA)—trnF (GAA) rps4) were used to examine monophyly phylogenetic relationships among subfamilial taxa....
Premise of the Study To improve our understanding patterns and drivers fleshy fruit phenology, we examined sequence, across years locations, fruiting times at five botanical gardens on three continents. Methods We monitored four stages phenology for 406 temperate, fleshy‐fruited, woody plant species in 2014 2015. Key Results Across all gardens, ripe fruits were present from May to March following year, with peak durations ranging under 1 week over 150 days. Species‐level first onset dates...
Summary Whittemore, A. T.: Species concepts: a reply to Ernst Mayr. – Taxon 42: 573–583. 1993. ISSN 0040‐0262. Mayr has recently analysed the flora of Concord, Massachusetts, and concluded that over 90 % native species plants are well described by his “biological concept”, which defines as interbreeding communities reproductively isolated from one another. However, many he considers be good species” either show little or no outcrossing else regularly exchange genes with other species....
Elms ( Ulmus spp.) are iconic street and landscape trees, but their use is currently limited by susceptibility to disease, especially Dutch elm disease (DED). Improved access disease-resistant germplasm will be of great benefit for ongoing breeding selection programs, these programs have been historically uncertain relationships among species, the North American species putative Old World relatives. Estimates genome size from 28 representing both subgenera (subg. subg. Oreoptelea ) six in...
A brief account of the geography and floristic regions Panamá is complemented with an historical liverwort studies this country. This followed by annotated checklist 289 taxa, including 93 new for Panamá. Among these are four hornwort taxa that represent first anthocerotes reported. Each entry comprises proper taxon citation, collection data and/or bibliographic references.
On the basis of its intricately pinnately branched rhizoids, dark-red, opaque stems, strong single costa, and long axillary hairs Adelothecium is aligned with unicostate genera Hookeriales. Within group genus appears isolated because presence pseudoparaphyllia, more or less unfurrowed exostome teeth, production gemmae on reduced branches, insertion rhizoids well below leaves around periphery buds. An evaluation gametophytic sporophytic features within Hookeriales indicates that two groups,...
Artificial cross-pollinations were carried out among seven species of Celtis L. ( C. bungeana Blume, koraiensis Nakai, laevigata Willd., occidentalis L., reticulata Torr., sinensis Pers., and tenuifolia Nutt.) to test the potential for interspecific hybridization in breeding. AFLP profiles used assess ancestry progeny. Hybrids formed very rarely these : only two hybrids obtained. Self-pollination occurred occasionally non-emasculated trees. analysis yielded false paternal markers at a low...
Premise of research. Ash (Fraxinus spp.), once dominant forest trees in eastern North America, are now endangered by the rapid spread emerald ash borer. Fraxinus is target conservation programs, but sampling genetic resources for requires a knowledge taxonomy order to ensure that genetically distinct groups being conserved, and this has been hampered serious disagreements about American Fraxinus. Polyploidy important speciation genus, so ploidy level determination can help establish natural...
The North American species of Celtis have been believed on anecdotal grounds to hybridize commonly in nature, and an understanding the nature frequency natural hybridization among is necessary for phylogenetic relationships within genus. Extensive introgression has strongly suspected between two with ranges that overlap broadly Texas, laevigata C. reticulata. Statistical study morphological AFLP data was undertaken test extent genetic consequences them. Results indicate there little or no...
Abstract Premise Leaf shape and size figure strongly in plants’ adaptation to their environments. Among trees, oaks are notoriously variable leaf morphology. Our study examines the degree which within‐tree, among‐tree, among‐site variation contribute latitudinal of bur oak ( Quercus macrocarpa : Fagaceae), one North America's most geographically widespread species. Methods Samples were collected from four sites each at northern, central, southern latitudes range. Ten traits measured,...