Scientific name Cyperus difformis L. An annual herb of the sedge family. Alias ​​triangular grass, ball flower sedge, yellow head and so on. Distributed in the Northeast, Hebei, Shanxi, Shaanxi, Guangdong, Yunnan and other provinces. It mainly affects rice and dry crops in low-humidity areas and is a common weed in rice fields in Putian and Honda.
Morphological characteristics Stems clustered, plant height 2-65cm, flat triangular, leaf base linear, apex acuminate, 4-30cm long, 1-4.5mm wide, leaf sheath purple-green, umbellate, 2-3 temporal lobes, With 3-8 different handles, the top spikelets. Spikelets oblong, tan, reddish brown membranous scales. Stamens 1–2, stigma 3-lobed. Each plant can produce tens to hundreds of thousands of small nuts. Nuts triangular-obovate, pale yellow. Rely on seeds.
Ecological characteristics are born in paddy fields or waterside wetlands, which have strong fertility and can grow into pieces in paddy fields. Shanghai emerged in early May. It blooms in late June and has a fertility period of 2 months. Mature seeds germinate after 2-3 months of dormancy, and they produce 2nd generation. An entire generation of Heilongjiang emerged in mid-May, flowered in July and matured in August.
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