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Earthshare of Washington

Home > Invasive Species

Collections Needed

Need help with identification?  Try:

Google Image Search

Plants of Washington Image Collection

Pierce County (44 taxa)

Scientific Name

Noxious

Weed Class

Phenology*
Collector**

Abutilon theophrasti

A
7-11
 

Anthriscus sylvestris

B
5-8
 

Buddleja davidii

C
7-10
 

Cardaria draba

C
5-6
 

Carduus nutans

B
6-9
 

Centaurea diffusa

B
7-10
 

Centaurea × moncktonii

B
8-9
J.M Grant

Centaurea stoebe

B
7-10
 

Chondrilla juncea

B
7-10
 

Clematis vitalba

C
7-10
 

Convolvulus arvensis

C
5-10
 

Cyperus esculentus

B
8-10
 

Daucus carota

B
5-10
Peter Zika

Echium vulgare

B
7-10
 

Egeria densa

B
5-10
 

Hemizonia pungens

C
8-10
 

Heracleum mantegazzianum

A
6-7
 

Hieracium sabaudum

B
9
 

Hieracium aurantiacum

B
5-9
 

Hieracium caespitosum

B
5-8
 

Hieracium pilosella

B
5-6
Dan Font

Hypericum perforatum

C
6-10
Peter Zika

Impatiens glandulifera

B
7-10
 

Iris pseudacorus

C
5-10
 

Kochia scoparia

B
9-12
 

Lepidium latifolium

B
5-9
 

Linaria vulgaris

C
6-8
 

Lythrum salicaria

B
7-9
 

Myriophyllum spicatum 

B
8-10
 

Myriophyllum aquaticum

B
7-10
 

Phalaris arundinacea

C
5-10
Michael Clegg, Peter F. Zika

Polygonum baldschuanicum

Monitor
5-10
 

Polygonum cuspidatum 

B
8-9
 

Polygonum sachalinense

B
7-10
Peter Zika

Potentilla recta

B
6-8
 

Proboscidea louisianica

Monitor
8-10
 

Senecio jacobaea

B
7-10
 

Solanum rostratum

A
8-9
 

Sonchus arvensis

B
7-9
 

Spartium junceum

A
6-11
 

Tanacetum vulgare

C
7-9
 

Ulex europaeus 

B
4-9
 

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