1.The stream bifurcates into two narrow winding channels.
那条小溪分成两股窄而弯曲支流。
2.Tendril unbranched or bifurcate. Inflorescence usually a polychasium. Seeds elliptic, obovoid-elliptic, or obtriangular, surface smooth, corrugated, or with strumose protuberance or ribs.