Fumaria officinalis (common fumitory, drug fumitory or earth smoke) is a herbaceous annual flowering plant in the poppy family Papaveraceae It is the most common species of the genus Fumaria in Western and Central Europe.It is an herbaceous annual plant which grows weakly erect and scrambling, with stalks about 10–50 cm long. It has londer, slender green leaves. Its pink 7–9 mm flowers appear from April to October in the northern hemisphere, or May to September in the UK.They are two lipped and spurred, with sepals running a quarter the length of the petals. The plant can have up to 20 flowers per spike. The fruit is a globe shaped, achene, which contains one seed. It contains alkaloids, potassium salts, and tannins. It is also a major source of fumaric acid.