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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

Wahkiakum County (22 taxa)

Scientific Name
Noxious Weed Class
Phenology*
Collector**

Centaurea jacea

B
8-9
 

Centaurea × moncktonii

B
8-9
 

Cirsium arvense

C
7-9
 

Cirsium vulgare

C
7-10
 

Conium maculatum

C
4-10
 

Convolvulus arvensis

C
5-10
 

Cytisus scoparius

B
3-10
Ben Legler

Egeria densa

B
5-10
 

Geranium robertianum

B
4-8
 

Hedera helix

C
9-5
Ben Legler

Linaria vulgaris

C
6-8
 

Myriophyllum spicatum 

B
8-10
David Giblin w/ Cathy Maxwell, Joe Arnett; Peter Zika w/David Giblin, Cathy Maxwell, Ben Legler

Nymphaea odorata

C
6-9
 

Phragmites australis subsp. australis

C
8-10
 

Polygonum sachalinense

B
7-10
 

Rorippa austriaca

B
5-6
 

Rorippa nasturtium-aquaticum

Monitor
4-9
 

Senecio jacobaea

B
7-10
David Giblin w/Cathy Maxwell, Joe Arnett

Tanacetum vulgare

C
7-9
 

Ulex europaeus 

B
4-9
 

Verbascum thapsus

Monitor
5-10
 

Xanthium spinosum

C
7-9
 

* 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