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一九七三年我站在早稻第二代螟虫检查中,发现个别田零星生长着一种野生植物——千里光。经考察,千里光原名田皂角,合萌,是一年生豆科杂草,常野生于河塘和田埂边。根茎中空,根茎密生根瘤,根上瘤形状圆而小,色白,茎上瘤扁绿色,瘤汁紫红,根瘤随水层高低而移动,无水时生在根际,有水时茎上也陆续生根瘤,主茎上和分枝上均结瘤。叶为羽状复叶,偶数,小叶数40～80片,叶长0.3～0.7厘米,叶色浓绿,昼开夜合。六月始花,八、九月进入盛花,花由白转黄。果荚长3～5厘米,有6～11节,节荚种子黑色、褐色,肾形,成熟时节荚断裂,随熟随丢,自然落粒。气温20℃时种子可发芽(在“清明”前后),气温25℃以上生长迅速,夏季下雷阵雨有利它生长,到了“立秋”生长缓慢,“霜降”后几乎停止生长,遇霜枯死。
In 1973, I stood in the check of the second generation of rice stem borers in early rice and found that there were sporadic plants in mycelium, a kind of rare plant. After investigation, the original name of Senecio saponins, aprons, annual leguminous weeds, often wild in Hetang and Tian 埂 edge. Rhizome hollow, rhizome dense root nodules, roots and oncology round and small, white, stem flat green tumor, tumor juice purple, nodules with the level of the water layer movement, when the water is born in the rhizosphere, there are water on the stem after another Nodules, nodules on the main stem and branches. Leaves are pinnately compound leaves, even, the number of leaflets 40 to 80, 0.3 to 0.7 cm long leaves, leaves color dark green, open day and night together. June is the beginning of flowers, August and September into full bloom, flowers from white to yellow. Pods 3 to 5 cm long, there are 6 to 11 sections, section pods black, brown, kidney-shaped, mature pods at break, with the cooked lost, the natural fall tablets. When the temperature is 20 ℃, the seeds can germinate (before and after “Qingming”), the temperature is above 25 ℃, and the growth is rapid. Under the thunderstorm, the thunder shower grows well in summer, Cream frost dead.