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duck herb. It is often mistaken for purple duck grass. Perennate herbs, stems draped or dangling. Leaf-based, leaf-shaped or oval-shaped, 3.5 to 6 cm long, soft hair, purple or green on top, mixed with white or purple stripes, purple-red below. Flower clusters, nearly handleless, born in 2 folding slivers; slivers and petals are combined with synthetic barrel-shaped, barrel with white; corolla tube white, cleavage-shaped, rose purple; male 6, all developed, equally long, flower silk with raw bead-like hair; sub-room 3 rooms, 2 embryos per room. Capsule. Originally from Mexico. China is widely cultivated. Garden ornamental plants. It is also a material for ordinary plant experiments to observe the flow of protosites (the skin of the flower wire). Similar to this species are Commelina communis and Setcreasea purpurea, the difference is that the duck grass leaves are all green, only 3 of the 6 males develop, the other 2 to 3 are not fully developed;