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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

Skagit County (47 taxa)

Scientific Name

Noxious

Weed Class

Phenology*
Collector**

Abutilon theophrasti

A
7-11
 

Aegilops cylindrica

C
5-11
 

Anthriscus sylvestris

B
5-8
 

Artemisia absinthium

C
7-10
 
Cardaria draba
C
5-6
 

Centaurea jacea

B
8-9
 

Centaurea macrocephala

A
6-8
 

Centaurea stoebe

B
7-10
 
Centaurea diffusa
B
7-10
 

Centaurea × moncktonii

B
8-9
 

Clematis vitalba

C
7-10
 

Convolvulus arvensis

C
5-10
 

Cuscuta approximata

C
7-9
 

Cyperus esculentus

B
8-10
 

Egeria densa

B
5-10
Ben Legler

Gypsophila paniculata

C
6-9
 

Hedera helix

C
9-5
Nisa Karimi

Heracleum mantegazzianum

A
6-7
 

Hieracium ×floribundum

A
6-8
 

Hieracium caespitosum

B
5-8
Ben Legler

Hieracium aurantiacum

B
5-9
 

Hyoscyamus niger

C
7-8
 

Impatiens glandulifera

B
7-10
Ben Legler

Kochia scoparia

B
9-12
 

Linaria vulgaris

C
6-8
Ben Legler

Linaria dalmatica

B
5-9
David Giblin
Lysimachia vulgaris
B
8-9
 

Lythrum salicaria

B
7-9
Ben Legler, David Giblin

Myriophyllum aquaticum

B
7-10
 

Myriophyllum spicatum 

B
8-10
Ben Legler

Polygonum baldschuanicum

Monitor
5-10
 

Polygonum polystachyum

B
8-10
 

Polygonum cuspidatum 

B
8-9
 

Polygonum sachalinense

B
7-10
Peter Zika, David Giblin, Ben Legler, Tad Dilhoff

Potentilla recta

B
6-8
Nisa Karimi

Proboscidea louisianica

Monitor
8-10
 

Rorippa sylvestris

Monitor
7-8
 

Rorippa nasturtium-aquaticum

Monitor
4-9
 

Senecio jacobaea

B
7-10
 

Solanum rostratum

A
8-9
 

Sonchus arvensis

B
7-9
Eliza Habegger, Peter Dunwiddie, David Giblin

Spartina anglica

B
7-9
 

Spartina alterniflora

B
9
Shannon Roys, Pam Camp

Torilis arvensis

B
5-9
 

Tripleurospermum inodorum

C
5-10
Jessica Ni, David Giblin

Ulex europaeus 

B
4-9
 

* 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