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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

Okanogan County (37 taxa)

Scientific Name
Noxious Weed Class
Phenology*
Collector**

Abutilon theophrasti

A
7-11
 

Anchusa officinalis

B
5-10
 

Anchusa arvensis

B
5-6
 

Berteroa incana

B
6-10
 

Carduus nutans

B
6-9
 

Carduus acanthoides

B
6-9
 

Centaurea solstitialis

B
7-10
 

Centaurea macrocephala

A
6-8
 

Centaurea × moncktonii

B
8-9
 

Chondrilla juncea

B
7-10
 

Cirsium vulgare

C
7-10
G. Horn

Conium maculatum

C
4-10
 

Convolvulus arvensis

C
5-10
G. Horn

Cynoglossum officinale

B
5-7
 

Cytisus scoparius

B
3-10
 

Euphorbia myrsinites

B
5-9
 

Hieracium aurantiacum

B
5-9
 

Hieracium caespitosum

B
5-8
 

Hyoscyamus niger

C
7-8
Charles B. Fiker, E. Joyal, P. Camp

Hypochaeris radicata

B
4-10
 

Lepidium latifolium

B
5-9
 

Linaria dalmatica

B
5-9
 

Linaria vulgaris

C
6-8
 

Mirabilis nyctaginea

A
5-8
 

Onopordum acanthium

B
6-9
 

Phragmites australis subsp. australis

C
8-10
 

Polygonum cuspidatum 

B
8-9
 

Polygonum sachalinense

B
7-10
 

Potentilla recta

B
6-8
 

Potentilla argentea

Monitor
6-9
Curtis Bjork

Senecio jacobaea

B
7-10
 

Solanum rostratum

A
8-9
 

Tamarix ramosissima

B
5-6
 

Tanacetum vulgare

C
7-9
 

Thymelaea passerina

A
8
 

Xanthium spinosum

C
7-9
 

Zygophyllum fabago

A
8-9
D. Stockdale, N. Hedges

* 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