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

King County (27 taxa)

Scientific Name
Noxious Weed Class
Phenology*
Collector**

Anchusa arvensis

B
5-6
 

Artemisia absinthium

C
7-10
 

Carduus nutans

B
6-9
 

Centaurea diffusa

B
7-10
Peter Zika, Sasha Shaw, John Thomas Howell

Centaurea jacea

B
8-9
 

Centaurea solstitialis

B
7-10
 

Centaurea nigra

B
8-9
G. N. Jones

Centaurea macrocephala

A
6-8
 

Chondrilla juncea

B
7-10
 

Cynoglossum officinale

B
5-7
 

Cyperus esculentus

B
8-10
 

Echium vulgare

B
7-10
 

Egeria densa

B
5-10
 

Eichhornia crassipes

Monitor
8-10
 

Euphorbia esula

B
5-7
 

Hieracium pilosella

B
5-6
 

Hieracium murorum

C
6-8
 
Linaria dalmatica subsp. dalmatica
B
5-9
Tracy Fuentes, Stewart Wechsler
Ludwigia hexapetala 
B
7-10
 

Matricaria perforata

C
5-10
 

Myriophyllum aquaticum

B
7-10
 

Nymphaea odorata

C
6-9
Steve Majerick

Onopordum acanthium

B
6-9
 

Potentilla recta

B
6-8
Erik Grijalva

Rorippa sylvestris

Monitor
7-8
 

Silene latifolia subsp. alba

C
4-8
George Neville Jones

Spartina anglica

B
7-9
P.F. Zika w/ A.L. Jacobson

Tamarix ramosissima

B
5-6
 

* 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