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Home > Invasive Species

Collections Needed

Need help with identification?  Try:

Google Image Search

Plants of Washington Image Collection

San Juan County (35 taxa)

Scientific Name

Noxious

Weed Class

Phenology*
Collector**

Alhagi maurorum

B
8-9
 

Anchusa officinalis

B
5-10
 

Anthriscus sylvestris

B
5-8
 

Artemisia absinthium

C
7-10
 

Buddleja davidii

C
7-10
 

Centaurea macrocephala

A
6-8
 

Centaurea diffusa

B
7-10
Peter Zika

Chondrilla juncea

B
7-10
 

Conium maculatum

C
4-10
 

Echium vulgare

B
7-10
 

Euphorbia oblongata

A
8-9
 

Gypsophila paniculata

C
6-9
 

Heracleum mantegazzianum

A
6-7
 

Hieracium aurantiacum

B
5-9
 

Hyoscyamus niger

C
7-8
 

Hypericum perforatum

C
6-10
 

Impatiens glandulifera

B
7-10
 

Lepidium latifolium

B
5-9
 

Linaria dalmatica

B
5-9
 

Lysimachia vulgaris

B
8-9
 

Lythrum salicaria

B
7-9
 

Nymphaea odorata

C
6-9
 

Onopordum acanthium

B
6-9
 

Polygonum cuspidatum 

B
8-9
 

Polygonum sachalinense

B
7-10
 

Potentilla recta

B
6-8
 

Potentilla argentea

Monitor
6-9
 

Salvia sclarea

A
7-10
 

Solanum rostratum

A
8-9
 

Spartina anglica

B
7-9
 

Spartium junceum

A
6-11
 

Tribulus terrestris

B
7-10
 

Tripleurospermum inodorum

C
5-10
 

Ulex europaeus 

B
4-9
 

Verbascum thapsus

Monitor
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