Field Guide to Noxious and Other Selected Weeds of British Columbia

Bladder Campion 
(Silene cucubalus)

perennial growing to 0.6 metres; white taproot and numerous deep penetrating woody branching roots; stems and leaves light green to whitish with a waxy bloom (fine powdery coating); bladder-like calyx has green to purplish veins and 5 short triangular teeth sometimes confused with night-flowering catchfly (Silene noctiflora) or white cockle (Lychnis alba) but has no hairs and is virtually waxy throughout

Bladder-like calyx

Photos courtesy Rosamund Pojar, Mountainview Ecological Services