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Sisymbrium altissimum L.

3 photos.
The "tall mustard" or "tumble mustard", another weedy species introduced into the western hemisphere
from Europe.

ITIS Taxonomic Serial No. 23312








1.  Late June.  Entire plant growing on
streambed material which was pushed
up for a dam.

2.  Upper section of plant.

3.  Terminal cluster of flowers with
developing seed pods.

All photos taken on Upper Half Dollar Creek
65°  25.51' N,   144°  46.67' W
Elev. 2000 ft.