Weed speciesThere were many types of weeds. According to their morphologies, they could be divided into gramineous weeds, broad-leaved weeds, and sedge weeds. The common weeds were as follows:
- Gramineous weeds: for example, barnyard grass, its seedlings are like rice, but the leaf sheath is hairless, without a leaf tongue and ear, it is the main weed in rice fields; crabgrass, its seeds spread quickly, its reproduction is strong, its plant grows fast and has many branches, it is widely grown in various herbal communities such as fields, roadsides, ditches, etc.; Green foxtail grew in the wilderness below 4000 meters above sea level and was a common weed in dry land crops, while spaghetti and wild oats were also graminaceous weeds.
- Broad-leaved weeds: field convolvulus, with halberd or arrow-shaped leaves, slender strips like small swords; bowl flower, with triangular halberd or triangular oval leaves; morning glory, with wide oval or nearly round leaves; Galium, a vicious weed in summer dry crop fields, and also a Chinese medicinal herb; red thistle, which grows in valleys, hillside forests, or forest edges; small canterfly, which often grows in the wilderness, wasteland, fields, and roadsides, is an invasive species in China; Dayflower, also known as Bamboo, grows in the northern and southern provinces east of Yunnan, Sichuan, and Gansu; Comma, grows on slopes 100 - 1900 meters above sea level and wet grasslands by the roadside; Angelica glabra, harvested and dried in the summer when it blooms, can be used as Chinese medicine; Ranunculus, grows on wet grasslands beside ditches and forest edges; Stachys, listed as top grade in Shennong's Herbal Classic; Spring grass, all over the country (Except for Inner Mongolia, Ningxia, Qinghai, and Xinjiang, no specimens have been found); Trigonum acuminatum, mostly distributed in Northeast China, North China, East China, Southwest China, Shaanxi, Gansu, etc.; Yin stone fern, a perennially herbaceous plant, growing on rocks or trees by streams; Cirrhidium acuminatum, distributed in Sichuan and other places in the mainland of China; Scissors, growing on wet roadside and beside fields; Mosquito, distributed in Northeast China, East China, Central China, and Southwest provinces; Stone coriander, often growing on the edge of aquatic vegetables, rice, and soybean fields and on the road ridge; Humulus humulus, which can be used as medicine, but is also an agricultural pest that harms fruit trees and crops; Rubus sorbidus, which is rich in vitamins and can be used as seasoning for cooking; horsetail, which grows mostly in humid grasslands and other places at an altitude of 0 - 3700 meters; Thorny grass, which is very adaptable and generally grows in abandoned land, cultivated land, roadside and other places; Imperata grass, which has strong regenerative ability and is extremely laborious to eradicate; Lepidium, which grows on slopes, ravines, roadsides and villages at an altitude of 400 - 2000 meters; Plantago could be found everywhere in the mountains, fields, roadsides and rivers from the south to the north of China. Chicken arrowhead was often found by streams, rivers, roadsides, forests and shrubs. Wild carrots mostly grew on hillsides, roadsides, wilderness or fields.
- Cyperus weeds: For example, Cyperus rotundus, its underground tubers are very difficult to kill.
In addition, purslane, bachelor grass, reeds, water hyacinths, horse ponds, and water peanuts were also common weeds that were difficult to control.
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