Persicaria senticosa

Persicaria senticosa or The mamako no shirinugui (scientific name: Persicaria senticosa) is an annual wild grass of the family Polygonaceae, genus Persicaria, native to East Asia including Japan, the Korean Peninsula and China. The stems are red with four ridges and densely covered with sharp downward thorns. The stems have alternate triangular leaves and kidney-shaped mendicant leaves. There are stinging hairs on the underside veins of the leaves. It grows by spreading long tendrils that entwine with other plants. In spring, the plant produces 6 to 10 small, pretty pink flowers at the tips of its branches. The flowers are white at the base and pink on top, but can also be red or white. There are actually no petals, and what looks like petals are five deeply lobed sepals. The flower has a creepy name: wiping your stepson's butt with thorny grass. It is also called "spiky buckwheat," which emphasizes the presence of the thorns.
The language of the flower is "unchanging love.

General name: Persicaria senticosa or The mamako no shirinugui , scientific name: Persicaria senticosa, Type of life: Annual plant, Place of origin: Japan, Korea, China and other East Asian countries, Leaf shape: triangular; leaf length: 3-8 cm; leaf inflorescence: alternate; leaf color: green; flower color: peach, red, white, Flowering season: May-October, inflorescence: raceme; corolla: absent; diameter of sepals that look like corolla: 0.5 cm; fruit type: slender; fruit color: black; fruit length: 0.4 cm.