Picture description:
Detailed description:
Plant form is a perennial herb, usually 30-80cm tall. The upper part of the stem is square, and the lower part is nearly round when old. The leaves are opposite, ovate to short round, 2 to 8 cm long, 1 to 4 cm wide, with coarse hairs on both sides, and the edges are coarsely serrated or notched. The stem leaves are sessile, most have 3 deep lobes, sometimes feathery lobes, and the edges of the lobes have Not neatly serrated. Spikes are terminal or born in the upper leaf axils. When blooming, they usually resemble a horsewhip. Each flower has one bract, which is slightly shorter than the calyx and has hairs on the outside. The calyx is tubular and 5-toothed; the corolla is tubular, lavender or blue. , nearly 2-lipped; stamens 4, two strong; ovary 4-chambered, 1 ovule in each cell. When ripe it splits into 4 small oblong nuts. The flowering period is from June to August, and the fruiting period is from July to November.
Identification:
Medicine properties: The stem of this product is square columnar, multi-branched, with longitudinal grooves on all sides, green-brown surface, rough; hard and brittle, with pith or pith on the cross section. Hollow. The leaves are opposite, shriveled, mostly broken, greenish-brown. When intact, the leaves are flattened and have 3 deep lobes, with serrated edges. The spikes are slender and have many small flowers. The smell is slight and the taste is bitter.
Character of the decoction pieces: This product is in irregular segments. The stem is square-cylindrical, with longitudinal grooves on all sides, and the surface is green-brown and rough. The cut surface is marrowed or hollow. The leaves are mostly broken, green-brown, and when intact, the leaves are 3-deeply divided after being flattened, and the edges are serrated. Spike-like inflorescences with many small flowers. The smell is slight and the taste is bitter.