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Conservation Assessment for the Whiteleaf Mountainmint (Pycnanthemum albescens Torr. & A.Gray) Steven R. Hill, Ph.D. Division of Biodiversity and Ecological Entomology Biotic Surveys and Monitoring Section 1816 South Oak Street Champaign, Illinois 61820 Prepared for the U.S.D.A. Forest Service, Eastern Region (Region 9), Shawnee and Hoosier National Forests INHS Technical Report 2007 (52) Date of Issue: 25 October 2007 Cover photo: Pycnanthemum albescens Torr. & A.Gray, from the PLANTS Database, U.S.D.A., photographer: Larry Allain @ USDA-NRCS PLANTS Database http://plants.usda.gov/java/largeImage?imageID=pyal_001_avp.tif This Conservation Assessment was prepared to compile the published and unpublished information on the subject taxon or community; or this document was prepared by another organization and provides information to serve as a Conservation Assessment for the Eastern Region of the Forest Service. It does not represent a management decision by the U.S. Forest Service. Though the best scientific information available was used and subject experts were consulted in preparation of this document, it is expected that new information will arise. In the spirit of continuous learning and adaptive management, if you have information that will assist in conserving the subject taxon, please contact the Eastern Region of the Forest Service - Threatened and Endangered Species Program at 310 Wisconsin Avenue, Suite 580 Milwaukee, Wisconsin 53203. 2 Conservation Assessment for the Whiteleaf Mountainmint (Pycnanthemum albescens Torr. & A.Gray) Table of Contents Acknowledgments............................................................................................................................4 Executive Summary.........................................................................................................................5 Nomenclature and Taxonomy..........................................................................................................6 Description of the Species................................................................….……..................................7 Habitat and Ecology.........................................................................................................................9 Distribution and Abundance..........................................................................................................11 Protection Status............................................................................................................................13 Life History....................................................................................................................................14 Population Biology and Viability..................................................................................................16 Potential Threats............................................................................................................................17 Research and Monitoring...............................................................................................................20 Restoration.....................................................................................................................................22 Summary........................................................................................................................................23 References......................................................................................................................................24 Websites Consulted........................................................................................................................27 Contacts..........................................................................................................................................28 Appendix 1. Representative specimens of Pycnanthemum albescens examined or cited in the literature...............................................................................…................30 Appendix 2. The distribution of Pycnanthemum albescens in the United States. Information from herbarium specimens and the literature.........................................32 Appendix 3. Natural Diversity Database Element Ranking System..............................................34 3 Conservation Assessment for the Whiteleaf Mountainmint (Pycnanthemum albescens Torr. & A.Gray) ACKNOWLEDGMENTS I would like to thank the staffs of the United States Forest Service, Shawnee and Hoosier National Forests, for the opportunity to compile these conservation assessments and for their invaluable assistance with data and field opportunities. Beth Shimp and Steve Widowski have been particularly helpful in facilitating these cost share agreements. I would also like to thank the grants and contracts staff of the Illinois Natural History Survey and the University of Illinois, Champaign, for their assistance with logistics necessary to complete these reports. Curators of several herbaria, cited in the appendices to this report, were very helpful in allowing access to the collections to obtain data on this plant. Several people also assisted by contributing information on this locally rare plant, including Mike Homoya in Indiana, Henrietta and Ken Chambers in Oregon, Phil Cantino and Mike Vincent in Ohio, and Andy Nelson in New York. This material is based upon work supported by the U.S.D.A. Forest Service, Eastern Region, under Cost Share Award No. AG03-CS-11090804-024. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author and do not necessarily reflect the views of the U.S.D.A. Forest Service, Eastern Region. 4 Conservation Assessment for the Whiteleaf Mountainmint (Pycnanthemum albescens Torr. & A.Gray) EXECUTIVE SUMMARY This Conservation Assessment is a review of the taxonomy, distribution, habitat, ecology, and status of the Whiteleaf Mountainmint, Pycnanthemum albescens Torr. & A.Gray, throughout the United States and in the U.S.D.A. Forest Service lands, Eastern Region (Region 9), in particular. This document also serves to update knowledge about the potential threats, and conservation efforts regarding the Whiteleaf Mountainmint to date. The Whiteleaf Mountainmint is a very fragrant perennial herb normally found in drier uplands, and it has short-pubescent whitish bracts, with multiple few-branched 4-angled [square] hollow stems. The species is known only from the United States, it has a somewhat scattered distribution in the southeastern, central, and plains states, and it is known historically from thirteen states, from Illinois, Kentucky and North Carolina south and west to Florida, Texas and Kansas. It has declined in recent decades. Globally, its ranking is G5 (secure world-wide); its National status in the United States is NNR (it has not been ranked nationally). It is most common in Arkansas, Louisiana, Missouri, and Mississippi. The Whiteleaf Mountainmint is listed as Endangered in two states, Illinois and Kentucky. The species is known from historic records only in Kansas, and it has been listed as a plant of Special Concern in Georgia. In Forest Service Region 9, the Whiteleaf Mountainmint is included on the Regional Forester Sensitive Species list (RFSS) for the Shawnee National Forest but not the Hoosier National Forest where it has not been found. It is at risk at the margins of its range. In addition to species listed as endangered or threatened under the Endangered Species Act (ESA), or species of Concern by U.S. Fish and Wildlife Service, the Forest Service lists species that are Sensitive within each region (RFSS). The National Forest Management Act and U.S. Forest Service policy require that National Forest System land be managed to maintain viable populations of all native plant and animal species. A viable population is one that has the estimated numbers and distribution of reproductive individuals to ensure the continued existence of the entity throughout its range within a given planning area. The objectives of this document are to: -Provide an overview of the current scientific knowledge on the species. -Provide a summary of the distribution and status on the species range-wide and within the Eastern Region of the Forest Service, in particular. -Provide the available background information needed to prepare a subsequent Conservation Approach. 5 Conservation Assessment for the Whiteleaf Mountainmint (Pycnanthemum albescens Torr. & A.Gray) NOMENCLATURE AND TAXONOMY Scientific Name: Pycnanthemum albescens Torr. & A.Gray [1841] Common Names: Whiteleaf Mountainmint; White-leaved Mountain-mint; White-leaf Mountain- mint; Whiteleaf Mountain Mint; White Mountain Mint; Mountain Mint Synonymy: Pycnanthemum incanum (L.) Michx. var. albescens (Torr. & A.Gray) Chapm. [1860] Koellia albescens (Torr. & A.Gray ex A.Gray) Kuntze [1891] Koellia pauciflora Small [1933] Class: Magnoliopsida (Flowering Plants - Dicotyledons) Family: Lamiaceae (= Labiatae; the Mint Family) Plants Code: PYAL (USDA NRCS plant database, W-1) http://plants.usda.gov/ The mint genus Pycnanthemum contains approximately 17 - 20 species, depending on its interpretation, all of which grow only in North America (Chambers 1961; Mabberley 1987). Most of the species grow in the eastern United States, with the center of diversity for the genus located in the mountains of North Carolina (Chambers 1961). The species appear to be most common in open forests and prairies, both wet and dry, as well as on barrens and other open rock habitats. As
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