Parrots Feather, Brazilian Water-milfoil

Haloragaceae

Introduced perennial aquatic or semi-aquatic forb, stems to 5m long, usually emerging up to 30cm above the water. Leaves whorled. Emergent leaves usually in whorls of 5-6, mostly 2.5-3.5cm long, 5-15mm wide, flat, glaucous, deeply dissected into 20-36 linear segments. Submerged leaves in whorls of 4-6, to 4cm long, 8-12mm wide. Male and female flowers on different plants. Only female plants in Australia. Flowers small (less than 3mm across). Flowers with 4 sepals, 0 petals, solitary at the bases of the leaves. Male flowers red, female flowers white. Flowers solitary at the bases of the leaves.

PlantNET description:  http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Myriophyllum~aquaticum

Weeds of Australia Biosecurity Queensland Edition description:  http://keyserver.lucidcentral.org/weeds/data/03030800-0b07-490a-8d04-0605030c0f01/media/Html/Myriophyllum_aquaticum.htm