HOME

About WNPS
Administration
Calendar
Contact WNPS
History
Donate
Membership
Online Store

Activities
Conservation
Ecosystems
Education
Landscaping
Native Plant Lists
Publications
Research
Restoration

Local Chapters
Field Trips
Programs
Plant Sales
Volunteer

Photo Gallery

Priorities
Garry Oak
Invasive Species
Shrub-Steppe

Programs
Growing Wild
Ivy OUT
WNPS Stewards

An Affiliate of

Earthshare of Washington

Home > Invasive Species

Collections Needed

Need help with identification? Try:

Google Image Search

Plants of Washington Image Collection

Clark County (40 taxa)

Scientific Name
Noxious Weed Class
Phenology*
Collector**
Abutilon theophrasti
A
7-11
 

Amorpha fruticosa

B
5-8
Ben Legler w/David Giblin

Anthriscus sylvestris

B
5-8
 
Carduus pycnocephalus
A
5-6
 
Centaurea × moncktonii
B
8-9
Peter Zika
Centaurea stoebe
B
7-10
 
Centaurea jacea
B
8-9
 
Cirsium arvense
C
7-9
 

Cirsium vulgare

C
7-10
 

Clematis vitalba

C
7-10
 
Convolvulus arvensis
C
5-10
 

Cytisus scoparius

B
3-10
 

Daucus carota

B
5-10
Ben Legler w/David Giblin
Echium vulgare
B
7-10
 

Egeria densa

B
5-10
 

Eichhornia crassipes

Monitor
8-10
 
Euphorbia esula
B
5-7
 
Heracleum mantegazzianum
A
6-7
 

Hypochaeris radicata

B
4-10
 

Impatiens glandulifera

B
7-10
 
Lepidium latifolium
B
5-9
 
Leucanthemum vulgare
B
5-9
 
Linaria vulgaris
C
6-8
 
Lythrum salicaria
B
7-9
 
Myriophyllum spicatum 
B
8-10
 

Myriophyllum aquaticum

B
7-10
 

Nymphoides peltata

B
8-10
Paul Berger

Phalaris arundinacea

C
5-10
 

Polygonum baldschuanicum

Monitor
5-10
 

Polygonum sachalinense

B
7-10
 

Potentilla recta

B
6-8
 
Pueraria montana var. lobata
A
7-9
 
Rorippa sylvestris
Monitor
7-8
 
Rorippa nasturtium-aquaticum
Monitor
4-9
 

Senecio jacobaea

B
7-10
 

Solanum rostratum

A
8-9
 

Solanum elaeagnifolium

A
5-10
 

Sonchus arvensis

B
7-9
William H. Baker

Sorghum halepense

A
10
 

Tanacetum vulgare

C
7-9
 
Verbascum thapsus
Monitor
5-10
 

* The numbers represent months of the year when the species has been collected, extracted from herbarium labels at WTU (with a few dates based on records at MO, NY, UC, and UBC).

On-line data sources for phenology:

MO:    http://mobot.mobot.org/W3T/Search/vast.html

NY:     http://sciweb.nybg.org/science2/vii2.asp

UBC:   http://herbarium.botany.ubc.ca/herbarium_data/vascular/search.htm

UC:     http://www.mip.berkeley.edu/www_apps/smasch/

WTU:   http://biology.burke.washington.edu/herbarium/collections/vascular/basicsearch.php

** email wnps@wnps.org when you've made a collection and we will put your name onto the list, this will help us minimalize duplication of efforts.  Use the email subject line:  Herbarium Collection