Myriophyllum
ussuriense is a dioecious perennial herb inhabiting marshy
places or wetlands, the stems erecting without branching; those
occurring in the water measure approximately 50cm long, and those in
wetlands 5-20cm in size. Deep pinnatifid leaves are in a whorl, each
0.5-2cm in length; the lobes are linear. With male flowers, petals
are 4 in number, sepals are in the shape of a bell, and stamens are
6-8 in number, while in female flowers, petals drop off early, and
stigmata are plumous. Bloom time: June-August. |