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What is this plant with small flowers?

Dog tail red, Chinese scientific name is red-spike amaranth, also known as thorn-haired amaranth, green-leaf amaranth, long-spike amaranth and so on. Amaranth, a woody plant of Euphorbiaceae, is native to tropical Asia. The plant is shrub-like, with a plant height of 0.5-3 meters. Leaves alternate oval, bright green, slightly shallow on the back; Petiole 5-6 cm long, villous. Spikes are born in the axils of leaves, which are cylindrical, bright red or dark red, with small flowers, no petals and unisexuality. Flowering: February-165438+1October. Nowadays, it is widely cultivated as a garden ornamental plant in tropical and subtropical areas, and is usually cultivated as a greenhouse potted flower in northern China. Generally, it is only 1 meter high when potted.