Plants of South Eastern New South Wales
Myriophyllum papillosum
Common name
Robust Water-milfoil
Family
Haloragaceae
Where found
In mud and shallow water. Tablelands and Western Slopes. Rarely elsewhere.
Notes
Perennial herb, rooting at the nodes in plants growing on mud. Stems to 0.4 m high, warty, robust, mostly 5–6 mm in diameter, rooting at the nodes. Emergent leaves or leaves in plants growing in mud in whorls of 4–6, usually 1.5–4.5 cm long, about 3 mm wide, linear, sometimes warty at the base, margins with 12–18 short teeth, tips pointed. Submerged leaves in whorls of 4–6, mostly 1.5–4.5 cm long, with 17–23 narrow segments like the teeth of a comb. Male and female flowers on the same stem. Male flowers with 4 white translucent hooded petals 2.5–3.6 mm long, falling early. Female flowers with 0 sepals, 0 petals, stigmas deep reddish purple. Flowers single or in clusters of 2 or 3 at the base of whorled leaves. Flowers Sep.–Apr.
Definite identification of species of Myriophyllum often requires microscopic examination of the seed cases, beyond the scope of this key.
PlantNET description: http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Myriophyllum~papillosum (accessed 24 January, 2021)
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