Long-beaked Arrowhead

Sagittaria australis

Weed Description
A shallow perennial aquatic weed with leaves shaped like an arrow. Leaves are usually above the water, but sometimes may be under or floating on the water.

Leaves
Arrow-shaped, with the lobes turned downward (sagittate), 4-12 inches long. The leaves occur on petioles that may reach 3 feet in length. Distinct veins can be observed on the leaves that arise from a common point (palmate veination, illustrated in the picture below).

Stems
The flowers and fruit are produced on leafless stems (scapes) that may reach 1 1/2 to 3 feet in height.

Flowers
Usually consist of 3 sepals and 3 white petals that are 8-14 mm long.

Fruit
Egg-shaped achenes that are widest at the apex (obovate), and approximately 2 inches in length. Several achenes may occur on each scape.

Roots
A corm which is often a thickened base that resembles a bulb.

Identifying Characteristics
Arrow-shaped leaves with distinct palmate veination and scapes that are usually longer than the leaves.

Trouble identifying a weed?

For additional assistance identifying weeds, contact Dr. Kevin Braldly, State Extension Weed Scientist (bradleyke@missouri.edu).

Office of Programs

University of Missouri

Long-beaked Arrowhead

Sagittaria australis

Trouble identifying a weed?