Myriophyllum papillosum Orchard

Robust Water-milfoil

Brunonia 8: 214 (1986) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Perennial aquatic or marsh herb, robust; stems 30–40 cm tall, mostly 5–6 mm diam., papillose, rooting at nodes in fully emergent plants. Leaves dimorphic; submerged leaves in whorls of 4–6, broadly ovate to orbicular, mostly 15–45 mm long, pectinate, with 17–23 pinnae; emergent leaves in whorls of 4–6, linear, mostly 15–45 mm long, sometimes papillose at base, margins with 12–18 teeth on distal three-quarters. Bracteoles of male flowers oblong, 0.6–0.8 mm long, fimbriate; bracteoles of female flowers minute; flowers solitary or in fascicles of 2 or 3. Male flowers sessile; sepals 4, lanceolate, c. 0.6 mm long; petals 4, 2.5–3.6 mm long, white-hyaline, caducous; stamens 8. Female flowers shortly pedicellate; sepals and petals absent; ovary 4-celled, styles more or less sessile, stigmas reddish-purple. Fruit cubiform, green to reddish-purple; mericarps narrowly ovoid, 0.8–1.0 mm long, apex oblique, dorsal surface coarsely papillose. Flowers Sep.–Apr.

CVU, DunT, Gold, MuF, MuM, MSB, NIS, RobP, VRiv, Wim. Also SA, Qld, NSW. Found mainly along the Murray River and its tributaries where it grows in shallow water or on mud.

Readily distinguished from its closest relatives by its robust habit, irregular gold-coloured papillae on the stems, flowers and fruit in fascicles and mauve to purplish stigmas.

Source: Jeanes, J.A. (1996). Haloragaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2017-08-16
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder [Saxifraganae]
order Saxifragales
family Haloragaceae
genus Myriophyllum
Higher taxa

Victoria

Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Myriophyllum papillosum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Myriophyllum papillosum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native
Wimmera present native
Victorian Riverina present native
Murray Scroll Belt present native
Robinvale Plains present native
Murray Fans present native
Goldfields present native
Central Victorian Uplands present native
Dundas Tablelands present native
Northern Inland Slopes present native

State distribution

Distribution map
State
South Australia
Queensland
New South Wales
Victoria