Identification of traits: The seeds are spherical and about 2 mm in diameter. The surface is black and a few immature people are red-brown. Observed with a magnifying lens, there are small, dense, verrucose projections, and a longitudinal groove with a light-colored punctiform umbilicus at one end. Hard texture, broken open, gram seed coat thin, the embryo bent into a ring, two cotyledons, endosperm white. Fire bursts when it bursts. Qi and tasteless.
The seeds are uniform, full and full, dark color is better.
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