小黑三棱 xiao hei san leng

Sparganium simplex Hudson, Fl. Angl., ed. 2, 2: 401. 1778, nom. illeg. superfl.

Stems emersed, erect, 30-70 cm tall, slender. Leaves 40-80 cm, aerial or floating, lower keeled on abaxial side. Racemes 10-20 cm; male heads 4-8, distinctly separate from female ones; female heads 3 or 4, relatively widely separated, sessile or lowest 1 or 2 pedunculate. Male flowers: perianth segments linear or spatulate, 2-2.5 mm, lobate at apex; filaments ca. 4 mm; anthers oblong, ca. 1.6 × 0.4 mm. Female flowers: perianth segments spatulate, ca. 3.5 mm, lobate at apex; ovary with short stalk; styles ca. 1 mm; stigmas 1.5-1.8 mm. Fruit fusiform. Fl. and fr. Jun-Oct. 2n = 30.

Margins of lakes, swamps, and streams. Gansu, ?Hebei, Heilongjiang, ?Henan, Jilin, Liaoning, Nei Mongol, ?Shaanxi, Xinjiang [Japan, Kazakhstan, Kyrgyzstan, Mongolia, Myanmar, Russia; Europe, North America].