Sichuan: Luhuo Xian.
Road (highway 317) between Luhuo and Ganzi (Garze). Zhuwai Pingqü, Kasa Tso, or Kasha Co (Kasha Lake).
Shallow lake, mostly with floating and emergent vegetation on all but N side, boggy margins, and adjacent fallow fields.
31°38'49"N,
100°15'59"E;
3545 m.
Shallow water of lake.Base of leaves more cordate than on most plants of P. amphibium; inflorescence emergent; flowers white.
David E. Boufford, Bruce Bartholomew, Susan L. Kelley, Richard H. Ree, Hang SUN, Ji-Pei YUE, Liang-Liang YUE, Da-Cai ZHANG & Wei-Dong ZHU