List 2: 
Invasive Species Discouraged-From-Use List

The following plants have either been determined invasive or suspected of being invasive and should be avoided if possible.

Scientific Name

Common Name

Notes

Reference

Aesculus hippocastanum

horsechestnut

Populations have been found in south end of Hendricks Park and this species is known to be problematic in other cities.

1

Anchusa azurea

anchusa; common bugloss

Exploding in large patches roadside and in woods in western Benton County. Also known recently from Lane and Clackamas counties.

1, 3

Cotoneaster franchettii

cotoneaster

Occurring in native prairies and woodland edges. (Cotoneaster franchetti, C. horizontalis, C. parneyi, etc. Best to avoid all cotoneasters.)

1

Cotoneaster horizontalis

cotoneaster

Occurring in native prairies and woodland edges. (Cotoneaster franchetti, C. horizontalis, C. parneyi, etc. Best to avoid all cotoneasters.)

1

Juniperus virginiana

eastern redcedar

Birds eat berries and spread seeds.

1

Ligustrum vulgare

common privet

Birds eat fruits and spread plants into woods and prairies.

1

Lunaria annua

honesty; money plant

Invasive in forest understories.

1

Melissa officinalis

lemon balm

Widespread weed in native prairies and openings in woods.

1

Myosotis scorpioides

common forget-me-not

Can dominate forest understories, especially openings and on edges.

1

Prunus domestica

plum

Not as invasive as P. avium.

1

Pyracantha spp.

fire thorn

Birds eat fruits and spread plants into prairies. P. angustifolia, P. coccinea, et al.

1

Pyrus communis

pear

This species appears occasionally in prairie areas and shrub/scrub communities throughout town.

5

Rorippa nasturtium-aquaticum

watercress

Chokes out small waterways on the valley floor.

1, 3

Rubus laciniatus

evergreen blackberry

Not as invasive as R. armeniacus, but still forms dense clumps.

1, 3

Sorbus aucuparia

European mountain-ash

Appearing in west Eugene wetlands and uplands. Birds spread seed.

1, 3

Vinca major

periwinkle; vinca

Mostly near old homesites -- they appear to spread vegetatively only. Completely dominates understories.

1

Vinca minor

periwinkle; vinca

Mostly near old homesites -- they appear to spread vegetatively only. Completely dominates understories.

1, 3

References
  1. Invasive Gardening and Landscaping Plants of the Southern Willamette Valley, Native Plant Society of Oregon, Emerald Chapter, 2001.
  2. Oregon’s Quarantine Against Noxious Weeds, Oregon Department of Agriculture, from http://www.oda.state.or.us/Plant/Weed_control/NoxWeedQuar.html accessed on 04/10/02.
  3. Draft of Exotic Pest Plants of Greatest Ecological Concern in Oregon and Washington; May 23 1997, The Pacific Northwest Exotic Pest Council, from http://www.wnps.org/eppclet.html accessed on 04/10/02,
  4. NW Oregon most harmful invasive plant species list: based on information provided at & before the October 10, 2001 meeting in Salem BLM, Bureau of Land Management, Salem District, 2001.
  5. City of Eugene staff recommendation based on resources utilized to remove from parks, open spaces and waterways.