Rootstock difference: the rootstock of Calamus is light brown, the rootstock of Water Calamus is yellowish brown. Leaf difference: Calamus leaves have no center rib, water caltrop leaves have obvious center rib. Difference in habit: Acorus calamus avoids direct sunlight, while Acorus calamus prefers light. Distribution difference: Calamus is produced in the provinces and districts south of the Yellow River, and water caltrop has production areas all over the country.

1, rhizome differences

Acorus calamus and Acorus calamus in the rhizome of the difference, where the rhizome of Acorus calamus thickness of 2-5mm or so, exudes a faint aroma, the color of light brown, fleshy, with a lot of fibrous roots, the length of the internode for the 3-5mm, and the The rhizome of Acorus calamus is 5-10mm thick, yellowish brown in color with hairy fibrous roots.

2, leaf difference

Calamus leaves are very thin, linear, the length of 20-30cm or so, sometimes up to 50cm, the leaf color is dark green, no midrib, while the water caltrop's leaves are sword-shaped linear, the length of 90-150cm, the leaf surface is bright, with obvious midrib.

3, different habits

Calamus is suitable for growth in a semi-shady environment, afraid of being directly exposed to sunlight, and like a moist environment, while the water caltrops also love to grow in the wet place, suitable for warm climates, the maintenance temperature should be controlled at about 20-25 ℃.

4, the distribution difference

Calamus produced in the provinces and regions south of the Yellow River, in northeastern India to the north of Thailand is also distributed, like to grow in the rich density of trees, and water caltrop in the northern and southern hemispheres of the temperate zone, subtropical are distributed throughout the country have production areas.