Anise is a dainty, white-flowered urnbelliferous annual, about 18 inches high, with secondary feather-like leaflets of bright green, hence its name (of mediaeval origin), Pimpinella, from dipinella, or twicepinnate, in allusion to the form of the leaves.

The fruit, or so-called seeds. When threshed out, the seeds may be easily dried in trays, in a current of air in half-shade, out-of-doors, or by moderate heat. When dry, they are greyish brown, ovate, hairy, about one-fifth of an inch long, with ten crenate ribs and often have the stalk attached. They should be free from earthy matter. The taste is sweet and spicy, and the odour aromatic and agreeable.

The commercial varieties differ considerably in size, but the larger varieties alone are official. The Spanish Anise, sold as Alicante Anise, are the largest and the best adapted for pharmaceutical use, yielding about 3 per cent. of oil. Russian and German fruits are smaller and darker and are the variety generally used for distillation of the volatile oil. Italian Anise is frequently adulterated with Hemlock fruit.