Myriophyllum verticillatum Linnaeus var. ussuriense Regel, Mém. Acad. Imp. Sci. Saint Pétersbourg, Sér. 7, 4(4) [Tent. Fl.-Ussur.]: 60. 1861.

Plants dioecious, rarely monoecious or with bisexual flowers. Stem weak, 5-20 cm. Submerged leaves 3- or 4-whorled, pectinate, broadly lanceolate in outline, 5-10 × 2.5-5 cm; segments filiform, short, margin entire; emergent leaves 1 or 2, linear or lanceolate, minute, margin serrate to entire. Inflorescence of axillary flowers on emergent part of stem or a terminal spike; bracts and bracteoles elliptic, smaller than flowers, margin entire or serrate. Flowers 4-merous. Calyx tubular, shortly lobed. Petals pale reddish, obovate-oblong, ca. 2 mm. Stamens 8. Styles 4; stigmas white, long fimbriate. Fruit olive-brown, 4-loculed, subglobose, ca. 0.75 × 0.6 mm; mericarps finely tuberculate. Fl. May-Jun, fr. Jun-Aug.

In FRPS (53(2): 135. 2000), this species was included in Myriophyllum propinquum A. Cunningham, which is separated on the size and shape of the bracteoles and flowers and is restricted to Australia and New Zealand.

Muddy waterside shallows; near sea level to 1800 m. Anhui, Guangdong, Guangxi, Hebei, Heilongjiang, Hubei, Jiangsu, Jilin, Jiangxi, Taiwan, Yunnan, Zhejiang [Japan, Korea, Russia].