Form: Myriophyllum crispatum is a robust erect perennial herb with soft curly hairs on stems and leaf bases, rooting at the leaf nodes
Foliage: Submerged leaves and emergent leaves are different. Submerged leaves are egg-shaped, 10-40mm long in rings of 5-8, leaves divided to midrib with close narrow segments like teeth on a comb Emergent leaves have rings of 6-9, decreasing from broadly lance-shaped and divided to toothed, to needle-like and entire to 20mm
Flowers: Single, stalkless male and female flowers in upper leaf axils. Female flowers lack sepals and petals, with white stigmas.
Fruit: Fruit is cubiform, yellow-brown to deep red
Habitat: Upright Water-Milfoil is aquatic to a depth of 1m, or semi-aquatic in swamps and mud and still to slow flowing streams. Full sun, semi-shade
Distinctive Features: This plant is readily identified by the presence of crisped hairs on the stems and leaf bases
Similar species: Similar to other Myriophyllum species, but distinguished by the stems and leaf-bases
