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How to Manage Pests

Identification: Weed Photo Gallery

| Weed Photo Gallery | Key to weeds in turf |

Gregg arrowhead

Scientific name: Sagittaria longiloba (Water plantain Family: Alismataceae)

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Life stages of Gregg arrowhead top picture bottom left picture bottom right picture

Gregg arrowhead is a native aquatic perennial that occurs in the Central Valley at low elevations (up to 100 feet (300 m). It resembles California arrowhead and is frequently found in wet excavated areas, irrigation ditches, and rice fields where stands are thin.

Seedling

Seedlings are submerged. Cotyledons (seed leaves) have narrow, light green leaves that taper to a point. Rectangular markings on the leaves help distinguish seedlings from ducksalad, river bulrush, and ricefield bulrush. The characteristic arrowhead leaf-shape appears with the third or fourth true leaf.

Mature plant

Leaves are much narrower than that of California arrowhead. The two bottom leaf lobes are about twice as long as the front lobe, whereas the two bottom leaf lobes of California arrowhead are shorter and broader.

Flower

Flowers have three white petals. Unlike Gregg's arrowhead, California arrowhead has two (rarely three) flowers at the lowest flowering stem node.

Reproduction

Gregg arrowhead spreads through seeds and underground stems.

Related species/Similar looking plants

More information

Statewide IPM Program, Agriculture and Natural Resources, University of California
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