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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

Benton County (36 taxa)

Scientific Name
Noxious Weed Class
Phenology*
Collector**

Abutilon theophrasti

A
7-11
 

Aegilops cylindrica

C
5-11
 

Alhagi maurorum

B
8-9
 

Amorpha fruticosa

B
5-8
 

Ambrosia tomentosa

Monitor
6-7
 

Carduus nutans

B
6-9
 
Centaurea diffusa
B
7-10
 
Centaurea stoebe
B
7-10
 

Centaurea solstitialis

B
7-10
 

Chondrilla juncea

B
7-10
 

Conium maculatum

C
4-10
 

Convolvulus arvensis

C
5-10
 
Cuscuta approximata
C
7-9
 
Cynoglossum officinale
B
5-7
 
Cyperus esculentus
B
8-10
 

Daucus carota

B
5-10
 
Epilobium hirsutum
C
7-10
 

Eruca vesicaria

Monitor
3-6
 
Euphorbia esula
B
5-7
 

Gypsophila paniculata

C
6-9
 

Hemizonia pungens

C
8-10
 
Hibiscus trionum
Monitor
9-10
 
Hieracium aurantiacum
B
5-9
 
Hypericum perforatum
C
6-10
 
Kochia scoparia
B
9-12
 

Linaria dalmatica

B
5-9
 

Lythrum salicaria

B
7-9
 

Onopordum acanthium

B
6-9
 
Phalaris arundinacea
C
5-10
 
Polygonum cuspidatum 
B
8-9
 
Sonchus arvensis
B
7-9
 
Sorghum halepense
A
7-9
 
Sphaerophysa salsula
B
5-6
 

Tamarix ramosissima

B
5-6
 

Tanacetum vulgare

C
7-9
 
Typha angustifolia
Monitor
8-9
 

* 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