Stethobaris ovata (LeConte) (Curculionidae) on Eastern Prairie Fringed Orchid [Platanthera leucophaea (Nuttall) Lindley] in Wisconsin

10.1649/816.1 ◽  
2006 ◽  
Vol 60 (1) ◽  
pp. 51-52 ◽  
Author(s):  
James C. Dunford ◽  
Daniel K. Young ◽  
Steven J. Krauth
Keyword(s):  
Platanthera Leucophaea

scholarly journals Protocorm mycobionts of the Federally threatened eastern prairie fringed orchid, Platanthera leucophaea (Nutt.) Lindley, and a technique to prompt leaf elongation in seedlings

2005 ◽  
Vol 53 ◽  
pp. 163-171 ◽  
Author(s):  
Lawrence W. Zettler ◽  
Kurt A. Piskin ◽  
Scott L. Stewart ◽  
Jared J. Hartsock ◽  
Marlin L. Bowles ◽  
...  
Keyword(s):  
Leaf Elongation ◽  
Federally Threatened ◽  
Platanthera Leucophaea

Platanthera lacera × leucophaea, a new cryptic natural hybrid, and a key to northeastern North American fringed-orchids

1999 ◽  
Vol 77 (8) ◽  
pp. 1144-1149 ◽  
Author(s):  
Paul M Catling ◽  
Vivian R Brownell
Keyword(s):  
North American ◽  
Hybrid Origin ◽  
Putative Hybrid ◽  
Herbarium Specimens ◽  
Morphological Attributes ◽  
Quantitative Characters ◽  
Hybrid Plants ◽  
York County ◽  
Spur Length ◽  
Platanthera Leucophaea

To evaluate the putative hybrid origin of fringed-orchids from York County, Ontario, morphological attributes of hybrid flowers were evaluated with respect to both a random sample of herbarium specimens and populations from the hybrid location. The putative hybrids were intermediate in spur length, petal width, and vertical distance across opening to the spur as well as in eight other quantitative characters. The hybrid is named Platanthera ×hollandiae Catling & Brownell (= Platanthera lacera (Michx.) G. Don × Platanthera leucophaea (Nutt.) Lindl.). With pale greenish-white flowers, partly reflexed lateral sepals, and a horizontally linear spur opening, the putative hybrid plants resemble P. lacera but can be readily distinguished by their relatively long spurs, relatively broad lateral petals, and ovoid instead of strap-shaped viscidium. A key including characteristics of the column is included that allows the separation of all northeastern North American fringed-orchids and their known natural hybrids.Key words: orchid, hybrid, Platanthera lacera, Platanthera leucophaea, Canada, Ontario.

scholarly journals Environmental and Management Effects on Demographic Processes in the U.S. Threatened Platanthera leucophaea (Nutt.) Lindl. (Orchidaceae)

Plants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1308
Author(s):  
Timothy J. Bell ◽  
Marlin L. Bowles ◽  
Lawrence W. Zettler ◽  
Catherine A. Pollack ◽  
James E. Ibberson
Keyword(s):  
Moisture Stress ◽  
Fire Frequency ◽  
Climatic Variation ◽  
Interactive Effects ◽  
Population Demography ◽  
Mortality Trends ◽  
Demographic Modeling ◽  
The U.S ◽  
Management Effects ◽  
Platanthera Leucophaea

Populations of the U.S. threatened orchid, Platanthera leucophaea, are restricted to fragmented grassland and wetland habitats. We address the long-term (1998–2020) interactive effects of habitat (upland prairie vs. wetland), fire management (burned vs. unburned) and climatic variation, as well as pollination crossing effects, on population demography in 42 populations. Our analysis revealed the consistent interactive effects of habitat, dormant season burning, and climatic variation on flowering, reproduction, and survival. Burning increased flowering and population size under normal or greater than normal precipitation but may have a negative effect during drought years apparently if soil moisture stress reduces flowering and increases mortality. Trends in the number of flowering plants in populations also correspond to precipitation cycles. As with flowering and fecundity, survival is significantly affected by the interactive effects of habitat, fire, and climate. This study supports previous studies finding that P. leucophaea relies on a facultative outcrossing breeding system. Demographic modeling indicated that fire, normal precipitation, and outcrossing yielded greater population growth, and that greater fire frequency increased population persistence. It also revealed an ecologically driven demographic switch, with wetlands more dependent upon survivorship than fecundity, and uplands more dependent on fecundity than survivorship. Our results facilitate an understanding of environmental and management effects on the population demography of P. leucophaea in the prairie region of its distribution. Parallel studies are needed in the other habitats such as wetlands, especially in the eastern part of the range of the species, to provide a more complete picture.

scholarly journals An expanded role for in vitro symbiotic seed germination as a conservation tool: two case studies in North America (Platanthera leucophaea and Epidendrum nocturnum)

Lankesteriana ◽  
2015 ◽  
Vol 7 (1-2) ◽  
Author(s):  
Emily Massey ◽  
Lawrence Zettler
Keyword(s):  
North America ◽  
Seed Germination ◽  
Case Studies ◽  
Mycorrhizal Fungi ◽  
Orchid Species ◽  
Symbiotic Germination ◽  
Symbiotic Seed Germination ◽  
Platanthera Leucophaea

Interest in using mycorrhizal fungi to cultivate orchids from seed in vitro (=symbiotic seed germina- tion) has intensified in recent years and this approach is now an important conservation tool worldwide. In North America, symbiotic germination has been attempted for a growing number of orchid species in peril as a means to acquire seedlings suitable for reintroduction.

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