Coefficient of Conservatism:
Coefficient of Wetness:
R. W. Smith
Wet meadows, shores, stream banks, and swamps.
A striking and extremely variable species in growth form and inflorescence; sometimes nearly 4 m tall in cultivated areas, and sometimes nearly prostrate on newly exposed shores. Plants are male and female, slightly dimorphic, with staminate plants tending to be taller. The tepals of the pistillate flowers are none or reduced, but those of staminate flowers are 5 and well developed. Apparent hybrids with A. retroflexus occasionally occur.