mystery plant

[Mary Barkworth]

[Mary Barkworth] Can anyone help?   
 
A gardener from Brigham City[Mary Barkworth] , Utah,  has found a plant
growing as a volunteer in her yard, and she has asked for an
identification.  All of us here at the Herbarium are completely stumped.
A photo is available at http://herbarium.usu.edu/unknown.htm
 
Several of the plants are 2 m in height, upright, herbaceous.  Leaves
are 5 times palmately lobed, NOT compound, about 18 cm long, with coarse
serrations at the tips of the lobes.  No flowers or fruits have
developed.  The leaves are slightly glandular-hairy, with no distinct
odor.
 
Can anyone help at all??
 
Your time and attention is much appreciated!
Alison Kelly 
Collections Manager, Intermountain Herbarium 
Utah State University 
Logan, UT 84322-5305 
Voice: 435.797.0061 / Fax:  435.797.1575 
ali at biology.usu.edu