2. Distribution and growth habit of Polygonum aviculare: It is distributed in Hainan, Fujian, Guangdong, Guangxi, Yunnan, Guizhou and other provinces from southwest to southeast of China. It is distributed in tropical areas of Asia and Africa.
Growth habit of Polygonum multiflorum Thunb.: It is mostly born in wet grass on hillsides, crevices and valleys. Farmland and grassland are parasitic on the roots of the host.
Third, the plant morphology of Polygonum multiflorum Thunb. Morphology of Polygonum multiflorum Thunb. Polygonum multiflorum Thunb. , also known locally as "malnourished grass", is an annual grass, semi-parasitic, 6 ~ 25 cm high, and the whole plant is rough and hairy; The stems are mostly square, with two longitudinal grooves, and the base is unbranched or slightly branched. The lower part of the leaf is opposite, the upper part is alternate, sessile, linear or narrowly oval, 5 ~ 12 mm long and 0 ~ 2 mm wide, but the lowest leaf often degenerates into scales. The stem is solitary or branched at the lower part, slender, 3 ~ 15 cm long, grayish brown, thick and short, with sparse and thin fibrous roots on the stem, which is slightly elastic. The leaves are small, alternate, linear or lanceolate, the upper leaves are larger, about 4 ~ 10 mm long, and often attached to the stem, while the lower leaves are small and scaly. Flowers yellow or purple, axillary or arranged in sparse spikes; Bracts obvious, longer than calyx; Calyx tube has 12[ 1] pulse. No breath, light taste. It is best to be gray-black, soft and spiny. No breath, light taste. There are white flowers, pink flowers, yellow flowers and safflower, which bloom from April to 10, and the flowers are solitary in the upper leaf axils; Bracteoles 2, linear or lanceolate, 2 ~ 4 mm long; Calyx tube, fleshy, 6 ~ 7 mm long, calyx teeth linear-lanceolate, 2 ~ 2.5 mm long, corolla yellow or sometimes pink, about 65438 0.3 cm long, corolla tube narrow, short glandular hairs, and the upper part suddenly bends downward; The crown has two lips, the upper lip is short, the top is slightly missing or 2-cleft, the lower lip is 3-cleft, and the upper lip is about half the length of the lower lip; 4 stamens, embedded, anther 1 room; The top of the style is rod-shaped capsule ovoid, about 3 mm long.
Fourth, the breeding method of the sole of the foot has seeds and ramets for breeding.