Intestinal beams are also known as guts, clusters of intestines, nettles, aluminum mak (Vientian). Scientific name Phyllanthus distichus Meull, Arg. (Phyllanthus acidus Skeels, Cicca disticha L.). Belongs to the castor family Euphorbiaceae. The gut is a small, smooth-stemmed tree. The branches have light gray bark, on the top there are many scars of old leaves. Young branches smooth pale green. The leaves are soft, thin, the upper surface is light green, the lower surface is lighter, the length is 4-5cm, the width is 18-20mm, the petiole side is obtuse or slightly rounded, the blade tip is pointed. Flowers grow in cymbal with stamens on small thin branches, 6-15cm long, clustered in clusters of 4-7 flowers on round nodes, in between fallen leaves. Fruit capsule, 4 pieces, pale black when ripe, 5mm diameter with slightly co-mature calyx, peduncle about 7mm long.