Synonyms for Love-in-a-mist (same or very similar meaning)
WordNet sense 1 (tropical American passion flower with finely dissected bracts; stems malodorous when crushed):
running pop, wild water lemonWordNet sense 2 (chickweed with hairy silver-grey leaves and rather large white flowers):
snow-in-summerFrom the ODE community, based on WordNetadd/edit