
Myriophyllum humile.©Paul Skawinski 2010.Robert W. Freckmann Herbarium.University of Wisconson at Stevens point.wisplants.uwsp.edu. (Accessed 4/2014).
Myriophyllum humile is a submersed to emersed perennial aquatic herb to 1 m long, stem tip often above water surface when flowering; underwater stems lax.
Leaves alternate, sub-opposite, irregularly scattered, sometimes whorled; pinnate, very finely divided, to 3.7 cm long, leaflets thread-like; stems emerging above surface or on mud, with leaves alternate, linear, undivided, or slightly pinnate.
Flowers brownish, small, 4-parted, axillary when submersed, or in short emergent spikes; blooms and fruits July-Sept.; Wind pollinated (Magee 1981).
Fruit hard, nut-like, 4-lobed, 0.1 cm.
Wetland status: OBL.
Frequency in NYC: Very infrequent.
Origin: Native.
Habitat: In quiet water or rooting in mud.