The leaves are oblong-lanceolate, lanceolate, elliptic or ovoid-lanceolate, sparsely round, 3-5(7) cm long and 0.8-3 cm wide, with a sharp tip, a wedge-shaped to nearly round base, thick dentate serrations sparsely distributed on the upper edge of the base, and about 5-6 pairs of lateral veins, protruding from the upper and lower midvein of the dimple, and the top is green.

The rest are sparsely puberulent along veins, or nearly hairless except veins, and the upper part is light green, usually densely puberulent along veins; Petiole 2- 10 mm long, concave and convex, puberulent.

Mentha haplocalyx is a perennial herb with an erect stem, 30-60 cm high, slender fibrous roots and horizontal creeping rhizomes at the lower part, quadrangular and with four grooves, the upper part is inverted and puberulent, and the lower part is only puberulent along the edge and multi-branched.

Introduction to mint:

Mint (scientific name: mint. ), also known as Yindancao, is a perennial herb of mint in Labiatae. The leaves are opposite, the flowers are small lavender, lip-shaped, and the flowers are small and dark purple-brown. Like warm, humid and sunny places, most of them are born in Shan Ye wetlands. The whole plant is green and fragrant, which is an aromatic crop with special economic value. ?

Mint is one of the commonly used Chinese medicines. It is a pungent, refreshing, sweating and antipyretic drug, which can be used to treat influenza, headache, red eye, body heat, sore throat and gum. External use can treat neuralgia, skin itching, rash and eczema. Usually use mint instead of tea to clear the heart and improve eyesight.

Mint is mostly wild and widely distributed in subtropical and temperate regions of the northern hemisphere. In China, the output of mint is the largest in Jiangsu and Anhui provinces. Mint is abundant in many countries in West Asia, Mediterranean coast, South Asia and Southeast Asia. There are three planting methods of mint: rhizome planting, ramet planting and cutting propagation.

There are many varieties of mint, and there are at least 600 varieties in the world. This is mainly because it is widely distributed and adaptable, and can successfully complete cross breeding in natural environment. There are many different classification methods of mint. Some are distinguished by the color of the stem, which can usually be divided into two categories: green stem mint and purple stem mint. Others divide mint according to the place of origin.