Weed Identification

Australia > QLD > > Limnocharis

Limnocharis

Limnocharis flava

IMPORTANT: IF YOU SUSPECT THE PRESENCE OF THIS PLANT, PLEASE REPORT IT BY CALLING 1800 084 881 (local call cost anywhere in Australia)
or
REPORT IT ONLINE.


Alternative Name(s): Yellow Burrhead.

Family: Limnocharitaceae.

Form: Water plant

Origin: Native from Mexico to Paraguay and to the Caribbean Islands.

Flowers/Seedhead: Flowers: At the end of long stems. Flowers recurving when fruiting and fruit buried in mud or water. Flowers year round.

Description: Perennial herb to 1 m high and rooting in mud. Leaves broad-ovate, thick, 5–30 cm long, 4–25 cm wide, leaf stalk (petiole) 5–75 cm long, green. Fruit compound, to 2 cm wide, each fruit containing about 1,000 seeds. Seeds dark brown, horseshoe-shaped, to 1.5 mm long with obvious ridges.

Distinguishing features: Distinguished by succulent angled stems and triangular leaf stalks; leaves with a number of longitudinal and transverse veins; pale yellow flowers in clusters (umbels) of 5–15; 3 larger petal-like tepals, pale yellow, about 1.5 cm long; more than 15 stamens (male organs of a flower) in each flower.

Dispersal: Spread by seed and vegetatively. Parts of fruit (follicles) float. Water dispersed.


Flowerheads on long stems turn
downwards after flowering
photo C. Wilson

Notes: Prolific seed producer and seed may persist for many years. Major rice weed in Malaysia, Indonesia and Sri Lanka. Also blocks drainage and irrigation channels. Grown as a vegetable in Indonesia. Under eradication at Centenary Lakes, Cairns and Townsville district, Queensland.

References:

    Reference: Northern Australia Quarantine Strategy Weeds Target List. B. Waterhouse and A. Mitchell. 1998, AQIS Miscellaneous Publication 6/98, pages 49–50.

Web References: Search Australian web sites for further information on this weed.


3-angled leaf stalks & round leaves
photo C. Wilson

Flower stems curve into the
water as fruit matures
photo B. Waterhouse

Fruit splits into
segments which
float
photo B. Waterhouse

This weed has been included in the WEEDeck field guide as card W09

More information about WEEDeck is available from Sainty & Associates Pty. Ltd.

 

Australia > QLD > > Limnocharis

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