NOTICE: The WeedUS Database of plants invading natural areas in the U.S. (including Hawaii) has been compiled from a wide variety of sources including publications, reports, surveys, and occasional personal observations from experts in the field. Sources include the National Park Service and other federal agencies, state and local natural resource departments, The Nature Conservancy, state and regional Exotic Pest Plant Councils and related organizations, universities and others. Sources for each plant listed are provided on the table -- click on the REFERENCE(S) header to go to a legend for the source codes. The current list includes over 1,000 plants and is updated as needed. Please contact Jil Swearingen (jil_swearingen@nps.gov) regarding any errors, omissions or potential additions to the list.

The purpose of this list is informational and educational and it is neither intended nor approved for use as a regulatory tool. Many of the species on this list are economically important horticultural plants but sometimes cause problems when they escape and establish in natural areas.

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Plant Conservation Aliance - Alien Plant Working Group's

Alien Plant Invaders of Natural Areas
By Scientific Name
Species beginning with the letter U
SCIENTIFIC NAME COMMON NAME STATES NATIONAL PARKS REFERENCE(S) FACT SHEET
Ulex europaeus European gorse; furze; whin CA, HI, OR, WA BOWA, HALE, REDW CAEPPC, FC, JS, NPSO, NWRA, PNWEPPC, SR, TNC, UHI Look-up Ulex europaeus on USDA PLANTS Volunteer
Ulmus parvifolia Chinese elm DC, NC, NE, NJ, VA, WI ROCR FC, NJDA, JS, WIDNR Look-up Ulmus parvifolia on USDA PLANTS Volunteer
Ulmus procera English elm CA DEVA JS Look-up Ulmus procera on USDA PLANTS Volunteer
Ulmus pumila Siberian elm; dwarf elm; littleleaf elm; AZ, IA, ID, IL, IN, KS, KY, MA, MD, MI, MN, MO, NE, NM, NV, OH, OK, OR, PA, TX, UT, VA, WA, WI, WV GLCA, GRCA AAPR, EU, FC, INPAWS, MDCES, MNDNR, JS, PADCNR, PNWEPPC, SR, TNC, VADCR, WI, WIDNR Look-up Ulmus pumila on USDA PLANTS Yes
Urena lobata Caesarweed FL, HI HALE ABS, FC, JS, UHI Look-up Urena lobata on USDA PLANTS Volunteer
Urochloa distachya tropical signalgrass HI   UHI Look-up Urochloa distachya on USDA PLANTS Volunteer
Urochloa maxima green panic grass; Guinea grass HI, TX HALE JP, JS, TNC, UHI Look-up Urochloa maxima on USDA PLANTS Volunteer
Urochloa mutica buffalo grass; Dutch grass; para grass FL, HI HALE ABS, FC, FLEPPC, JS, UHI Look-up Urochloa mutica on USDA PLANTS Volunteer

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http://www.nps.gov/plants/alien/list/u.htm
Last updated: 10-Apr-2007