Invasiveness Ranking System for Non-Native Plants of Alaska

Hearnden, M.N. and B.H. Kay. 1997. Importance of Hydrilla verticillata (Hydrocharitaceae) as habitat forimmature mosquitoes at the Ross River Reservoir, Australia. Journal of the American Mosquito ControlAssociation 13: 164-170.Heathcote, G.D. and W.J. Byford. 1975. Surveys of sugar-beet seed crops, mangold clamps and weeds inEngland for aphids and viruses, 1963-73. The Journal of Agricultural Science 84: 87-95.Heffernan, K.E., P.P. Coulling, J.E. Townsend, and C.J. Hutto. 2001. Ranking Invasive Exotic Plant Species inVirginia. Natural Heritage Technical Report 01-13. Virginia Department of Conservation and Recreation,Division of Natural Heritage, Richmond, Virginia. 27pp. plus appendices.Heidel, B. 1987. Element stewardship abstract for Carduus nutans Musk thistle. The Nature Conservancy.Arlington, Virginia. Available: http://tncweeds.ucdavis.edu/esadocs/allipeti.html [2005, May 2].Heidorn, R. 1991. Vegetation management guideline: purple loosestrife (Lythrum salicaria L.). Natural AreasJournal. 11(3): 172-173.Heiligmann, R.B. 2006. Controlling undesirable trees, shrubs, and vines in your woodland. Ohio StateUniversity Extension Fact Sheet. School of Natural Resources. Available: http://ohioline.osu.edu.Heutte, T. Botanist, USDA Forest Service. Ketchikan-Misty Fiords and Wrangell Ranger Districts, 648Mission Street, Ketchikan, Alaska 99901. Tel: (907) 228-4132 – Pers. obs.Heys, J., Exotic Plant Management Program Coordinator, National Park Service, Alaska Region - BiologicalResources Team, 240 W. 5th Ave, #114, Anchorage, AK 99501 tel: (907)644-3451, fax: 644-3809 – pers.obs.Hill, K.A., R.P.C. Townsend, M.J. Hill, and J.G. Hampton. 1999. Weed seeds in white clover seed lots: lossesduring seed cleaning. Agronomy Society of New Zealand. Proceedings annual conference 29: 27-30.Hitchcock, C.L. and A. Cronquist. 1973. Flora of the Pacific Northwest. An illustrated manual. University ofWashington Press, Seattle and London. P. 623.Hodkinson, D. and K. Thompson. 1997. Plant dispersal: the role of man. Journal of Applied Ecology, 34: 1484-1496.Hoffmann, M.H. 2001. The distribution of Senecio vulgaris: capacity of climatic range models for predictingadventitious ranges. Flora 196: 395-403.Hofmann, M. and J. Isselstein. 2004. Effects of drought and competition by a ryegrass sward on the seedlinggrowth of a range of grassland species. Journal of Agronomy and Crop Science 190: 277-286.Hoppes, W.G. 1988. Seedfall pattern of several species of bird-dispersed plants in Illinois woodland. Ecolology.69(2): 320-329.Hoshovsky, M. 1986. Element Stewardship Abstract for Cytisus scoparius and Genista monspessilanus. ScotchBroom, French Broom. The Nature Conservancy. Arlington, VA.Hoshovsky, M.C. 1989. Element stewardship abstract for Rubus discolor, (Rubus procerus) Himalayanblackberry. Arlington, Virginia: The Nature Conservancy. Available: http://tncweeds.ucdavis.edu/esadocs/rubudisc.html via the INTERNET. Accessed 2005 Feb 07.Hoshovsky, M.C. 2000. Rubus discolor Weihe & Nees. In: Bossard CC, Randall JM and Hoshovsky MC,editors. Invasive plants of California’s wildlands. Berkeley, Los Angeles, London: University of CaliforniaPress. p 277-281.Hoshovsky, M.C. 1986. Element stewardship abstract for Verbascum thapsus Common mullein. The NatureConservancy, Arlington, Verginia.Houssard, C. and J. Escarre. 1991. The effects of seed weight on growth and competitive ability of Rumexacetosella from two successional old-fields. Oecologia 86(2): 236-242.Howald, A. 2000. Lepidium latifolium L. In: Bossard, C.C., J.M. Randall, M.C. Hoshovsky, editors. Invasiveplants of California’s wildlands. Berkeley, CA: University of California Press: 222-227.B-157