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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

Island County (31 taxa)

Scientific Name
Noxious Weed Class
Phenology*
Collector**

Abutilon theophrasti

A
7-11
 

Artemisia absinthium

C
7-10
 

Centaurea × moncktonii

B
8-9
 

Centaurea jacea

B
8-9
 

Centaurea calcitrapa

A
5-6
 

Centaurea macrocephala

A
6-8
 

Centaurea diffusa

B
7-10
 

Centaurea nigra

B
5-10
 

Cuscuta approximata

C
7-9
 

Egeria densa

B
5-10
 

Gypsophila paniculata

C
6-9
 

Hedera helix

C
9-5
 

Heracleum mantegazzianum

A
6-7
 

Hieracium caespitosum

B
5-8
 

Hieracium aurantiacum

B
5-9
 

Iris pseudacorus

C
5-10
 

Linaria vulgaris

C
6-8
 

Lythrum salicaria

B
7-9
 

Myriophyllum aquaticum

B
7-10
 

Myriophyllum spicatum 

B
8-10
 

Nymphaea odorata

C
6-9
 

Phalaris arundinacea

C
5-10
 

Polygonum cuspidatum 

B
8-9
 

Polygonum sachalinense

B
7-10
 

Salvia pratensis

A
6-7
 

Salvia sclarea

A
7-10
 

Silybum marianum

A
6-10
 

Solanum rostratum

A
8-9
 

Spartium junceum

A
6-11
 

Tripleurospermum inodorum

C
 
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