Robert Emanuel

Water Resources Project Manager, Clean Water Services

October 12, 2013

WASHINGTON COUNTY & TUALATIN BASIN

INVASIVE SPECIES

KEYS TO IDENTIFYING THE INVADERS

• Flowers

• Leaves and stems

• Habit (vine, herb, grass, rosette, etc.)

• Key characteristics (odor, reflectivity, color)

• Developing a “search pattern”

Looking down as you

walk, can you see the

plant’s pattern among

the others?

SPRING

Glenn M

iller, OD

A

Garlic Mustard: Alliaria petiolata

Glenn M

iller, OD

A

Glenn M

iller, OD

A

Elizabeth J. C

zarapata

Glenn Miller, ODA

7-15’ tall

2-4’ tall

SUMMER

Yellow Flag Iris Iris pseudacorus

Ph

oto

: Jud

y Scott, O

SU

Emily DeBolt

Purple Loosestrife

Purple Loosestrife

Gle

nn M

iller

, OD

A

Giant Knotweed Fallopia sachalinese

EXTRA CREDIT

Carla Cole, NPS

Spurge Laurel: Daphne laureola

Carla Cole, NPS

Tania Siemens, TNC

Carla Cole, NPS

Yellow Archangel Lamiastrum galeobdolon

Ph

oto

s: WA

State Wee

d C

on

trol B

oard

Yellow Archangel Lamiastrum galeobdolon

Italian Lords and Ladies Arum italicum

Italian Lords and Ladies Arum italicum

Lesser Celandine Ranunculus ficaria

Lesser Celandine Ranunculus ficaria

TRUE AQUATICS

REPORTING YOUR FINDS

www.oregoninvasiveshotline.org

Only YOU can prevent

the invasion!

DON’T BE A VECTOR!

• Clean your clothes

• Clean your pets

• Clean your equipment & vehicle

• Walk around the infestation

• Bag/trash, burn, no compost

• If collecting voucher in flower or fruit, seal it

J.K. Linsey

QUESTIONS?

Partners for a Weed-Free Tualatin Basin: