Weeds - Goulburn Broken Catchment Management Authority

Undeclared Weed
Arrowhead
Description: Emergent aquatic herb that is rooted in the soil.
Spreads from seed, rhizomes and tubers.
flowers: White to pink and always below leaf height. 3 cm in
diameter formed in three flowered whorls at the end of stalks,
each with three sepals and three petals. Appear from January
to May.
fruit: In clusters 5-15 mm wide amongst flower heads.
leaves: Emergent leaves broad and then tapering to a point.
10-25 cm long, 2-8 cm wide and on stems with triangular
cross-section. Submerged leaves are strap like and up to
50 cm long and 2.5 cm wide.
stems: Erect or occasionally bent near the middle. Up to
20 cm long and ending in flower clusters.
Note: Competitive weed of waterways and rice fields. A
particular threat to natural lagoons and backwaters.
similar Native species: Could be confused with water
plantain (Alisma plantagoñaquatica). Juvenile form can be
confused with other species in the same family (Alismataceae),
before mature, upright leaves develop, including A. plantagoaquatica
and Damasonium minus.
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Sagittaria graminea
(Sagittaria, Delta Arrowhead, Slender Arrowhead)
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