Native Swamp Thistle; flower heads are not spiny
by northeastwisc Jan 8, 2008 4:04 AM
Lower stem dark purple; few, if any, thorns
by northeastwisc Jan 8, 2008 4:04 AM
Upper stem is green, lower stem is dark purple. Few, if any, thorns on stem.
by northeastwisc Jan 8, 2008 12:25 PM