In the names of flowers, this 4-letter word that means "plant" or "root" follows bladder, St. John's & slipper
[DOC] [TLE] Wildflower List - US Wildflowers [PAR] The leaves, in my opinion, encircle the stem too much for this to be Aromatic 
Aster ... colorful deep purple to pink compound flowers on leafy plants growing to 
4, 5, ..... green papery-shelled 'bladder', giving it the 'bladdernut' common name.