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Earthshare of Washington

Home > Invasive Species

Collections Needed

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Plants of Washington Image Collection

Spokane County (38 taxa)

Scientific Name

Noxious

Weed Class

Phenology*
Collector**

Abutilon theophrasti

A
7-11
 

Aegilops cylindrica

C
5-11
 

Alopecurus myosuroides

B
5-6
 

Anchusa arvensis

B
5-6
 

Anthriscus sylvestris

B
5-8
 

Carduus nutans

B
6-9
 

Carduus acanthoides

B
6-9
 

Centaurea repens

B
6-10
 

Centaurea × moncktonii

B
8-9
 

Centaurea jacea

B
8-9
 

Centaurea macrocephala

A
6-8
 

Centaurea stoebe

B
7-10
 

Centaurea solstitialis

B
7-10
 

Chaenorrhinum minus

Monitor
6-7
 

Cirsium vulgare

C
7-10
 

Cirsium arvense

C
7-9
 

Conium maculatum

C
4-10
 

Cynoglossum officinale

B
5-7
 

Cytisus scoparius

B
3-10
 

Euphorbia esula

B
5-7
 

Euphorbia myrsinites

B
5-9
 

Hieracium caespitosum

B
5-8
 

Hyoscyamus niger

C
7-8
 

Hypericum perforatum

C
6-10
 

Hypochaeris radicata

B
4-10
 

Kochia scoparia

B
9-12
 

Leucanthemum vulgare

B
5-9
 

Mirabilis nyctaginea

A
5-8
 

Myriophyllum spicatum 

B
8-10
 

Nymphaea odorata

C
6-9
 

Nymphoides peltata

B
8-10
 

Onopordum acanthium

B
6-9
 

Potentilla argentea

Monitor
6-9
 

Sonchus arvensis

B
7-9
 

Tamarix ramosissima

B
5-6
 

Tanacetum vulgare

C
7-9
 

Tribulus terrestris

B
7-10
 

Tripleurospermum inodorum

C
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