Virginia Tech Weed Identification Guide

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.

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

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

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.