Wetland I.D. Guide - Island County Government

non-native Vegetation
Bull Thistle – Cirsium vulgare
general: Spiny, toothed leaves and spines on stems. Pink-purple prickled flowers are 2 to 4
cm long and longer than those of Canadian Thistle. Is rooted with a fleshy taproot.
Where Found: Fields, pastures, meadows, clearings and roadsides. Common in agricultural areas.
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Himalayan Blackberry – Rubus procerus or Rubus discolor or Rubus armeniacus
general: This plant forms dense impenetrable thickets with branches most notably
covered in sharp thorns. Green leaves are present year round and have three or five lobes.
Produces edible berries in late summer.
Where Found: Disturbed sites and can dominate wetlands.
Canadian Thistle – Cirsium arvense
general: Spiny, toothed leaves, and prickles on pink-purple flowers. Flowers are 1 to 2 cm long
and smaller than those of Bull Thistle. Grows via creeping rhizomes.
Where Found: Fields, pastures, meadows, clearings and roadsides. Common in agricultural
areas.
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Field Indicators
Moderate
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Moderate
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Poor
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