Tall water-hemp

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Tall water-hemp flower

Tall water-hemp

Tall water-hemp flowers

Tall water-hemp leaf

Tall water-hemp flowers

Tall water-hemp flower

Tall water-hemp

Tall water-hemp inflorescence

Tall water-hemp

Morphology

Stem

Erect, much-branched, glabrous or nearly so; nodes without paired spines.

Leaves

Cauline, alternate; long-petiolate; blade oblong to elliptic, lanceolate, or rhombic, 4/5 to 8 inches long, 2/5 to 2 inches wide, base acute to attenuate, often oblique, margins entire, tip acute to rounded or occasionally notched, surfaces glabrous.

Inflorescence

Terminal panicles, axillary usually spikes, sometimes panicles; bracts 3, lanceolate, shorter than to as long as tepals, .06 to .1 inch, apex long-acuminate.

Flower

Staminate flowers: tepals 5, unequal or equal, oblong-elliptic to lanceolate, .1 to .12 inch or inner ones slightly shorter when unequal, apex acuminate to awn-like; stamens 5. Pistillate flowers: tepals 0-2, unequal, lanceolate to linear, .02 to .08 inch, apex awn-like; stigmas 3-4.

Fruit

Utricles 1/25 to 1/12 inch; seed 1, black, biconvex, ca. 1/25 inch.

Ecology

Habitat

Shores of rivers, streams, lakes, ponds, and reservoirs, sandbars, marshes, moist sites in fields and pastures, and waste places.

Distribution

Occurs statewide

Additional Notes

Synonyms

Alternative scientific names that have been used for this plant.