Washington Native Plant Society: Invasive Species

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King County (27 taxa)

Scientific Name	Noxious Weed Class	Phenology*	Collector**
Anchusa arvensis	B	5-6
Artemisia absinthium	C	7-10
Carduus nutans	B	6-9
Centaurea diffusa	B	7-10
Centaurea jacea	B	8-9
Centaurea solstitialis	B	7-10
Centaurea nigra	B	8-9
Centaurea macrocephala	A	6-8
Chondrilla juncea	B	7-10
Cynoglossum officinale	B	5-7
Cyperus esculentus	B	8-10
Echium vulgare	B	7-10
Egeria densa	B	5-10
Eichhornia crassipes	Monitor	8-10
Euphorbia esula	B	5-7
Hieracium pilosella	B	5-6
Hieracium murorum	C	6-8
Linaria dalmatica subsp. dalmatica	B	5-9	Tracy Fuentes
Ludwigia hexapetala	B	7-10
Matricaria perforata	C	5-10
Myriophyllum aquaticum	B	7-10
Nymphaea odorata	C	6-9
Onopordum acanthium	B	6-9
Potentilla recta	B	6-8
Rorippa sylvestris	Monitor	7-8
Silene latifolia subsp. alba	C	4-8
Spartina anglica	B	7-9
Tamarix ramosissima	B	5-6

* 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