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Earthshare of Washington

Home > Invasive Species

Collections Needed

Need help with identification?  Try:

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Plants of Washington Image Collection

Kittitas County (53 taxa)

Scientific Name
Noxious Weed Class
Phenology*
Collector**

Abutilon theophrasti

A
7-11
Don Knoke

Aegilops cylindrica

C
5-11
Don Knoke

Anchusa officinalis

B
5-10
 

Anchusa arvensis

B
5-6
Don Knoke

Artemisia absinthium

C
7-10
Don Knoke

Bryonia alba

B
5-10
 

Cardaria draba

C
5-6
Don Knoke

Carduus nutans

B
6-9
 

Cenchrus longispinus

B
7-10
 

Centaurea calcitrapa

A
5-6
 

Centaurea solstitialis

B
7-10
Don Knoke w/ Mark Eylar

Centaurea jacea

B
8-9
 

Centaurea stoebe

B
7-10
Don Knoke

Centaurea × moncktonii

B
8-9
Peter Zika, Don Knoke

Cirsium vulgare

C
7-10
Don Knoke

Cirsium arvense

C
7-9
Don Knoke

Clematis vitalba

C
7-10
 

Conium maculatum

C
4-10
Don Knoke

Cuscuta approximata

C
7-9
 

Cynoglossum officinale

B
5-7
Don Knoke, Ben Legler

Cytisus scoparius

B
3-10
Don Knoke

Daucus carota

B
5-10
Ben Legler, Don Knoke

Euphorbia myrsinites

B
5-9
 

Gypsophila paniculata

C
6-9
 

Hedera helix

C
9-5
 

Hedera hibernica

C
10-5
 

Heracleum mantegazzianum

A
6-7
 
Hieracium aurantiacum
B
5-9
Ben Legler, Peter Zika, Don Knoke w/ Jim Duemmel, David Giblin; David Giblin w/Wendy Gibble

Hypericum perforatum

C
6-10
Don Knoke

Hypochaeris radicata

B
4-10
Don Knoke, Mary Fries

Iris pseudacorus

C
5-10
Don Knoke w/David Giblin

Isatis tinctoria

A
5-6
 

Kochia scoparia

B
9-12
Don Knoke

Lepidium latifolium

B
5-9
Don Knoke, Joy Mastrogiuseppe w/ Donna Wilcox

Leucanthemum vulgare

B
5-9
Jim Duemmel w/Don Knoke, David Giblin; Don Knoke

Linaria vulgaris

C
6-8
Don Knoke

Lythrum salicaria

B
7-9
Don Knoke

Myriophyllum spicatum 

B
8-10
Don Knoke, Don Knoke w/David Giblin

Onopordum acanthium

B
6-9
Don Knoke

Phalaris arundinacea

C
5-10
Jim Duemmel w/Don Knoke, David Giblin; Don Knoke w/Barbara Williams, Megan A. Jensen, Don Knoke

Polygonum cuspidatum 

B
8-9
 

Polygonum sachalinense

B
7-10
 

Potentilla recta

B
6-8
Don Knoke

Secale cereale

C
5-8
Don Knoke

Senecio jacobaea

B
7-10
Don Knoke

Solanum rostratum

A
8-9
Don Knoke; Don Knoke w/Mark Eylar

Sonchus arvensis

B
7-9
Don Knoke, Joy Mastrogiuseppe

Sorghum halepense

A
10
 

Tamarix ramosissima

B
5-6
 

Tanacetum vulgare

C
7-9
Don Knoke

Tribulus terrestris

B
7-10
Don Knoke

Tripleurospermum inodorum

C
5-10
Don Knoke, David Giblin

Xanthium spinosum

C
7-9
Don Knoke w/Mark Eylar

* 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