P. javanicus javanicusP. javanicus
Floating leaves narrow-oblong to elliptic or lanceolate, 2–3 cm long, 5 mm wide; submerged leaves linear, 3–10 cm long. Spikes narrow, 2–3 cm long, on slender peduncles. Coast. Uncommon. Fl. spring–summer
Floating leaves narrow-oblong to elliptic or lanceolate, 2–3 cm long, 5 mm wide; submerged leaves linear, 3–10 cm long. Spikes narrow, 2–3 cm long, on slender peduncles. Coast. Uncommon. Fl. spring–summer