Cheru narakam (Citrus limon) is the common citrus lemon which is commonly used in lemonades and for pickling.
The lemon tree produces small fleshy fruits, which gives a sour-tasting juice. Citric acid is the component that gives the sour taste.
This perennial tree grows 10-20 ft high. Stem and branches bear thorns and dark green aromatic leaves.
It has carminative properties and can be regarded as an Ayurvedic herb too. It acts against such diseases like scurvy.