Cycnogeton microtuberosum (Aston) Mering & Kadereit

Diversity Phylogeny Evol. Monocotyledons 73 (2010) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: rare (r)

Similar to Cycnogeton procerum but tubers smaller, globular-obloid, 4–13(–17)mm long, 3–6 mm diam., numerous, terminating very short roots 1–7(–14) mm long and hence clustered closely against the rhizome; leaves usually erect, more thickly spongy basally, ± semicylindric in cross-section c. 3 cm below the sheath summit with the width of the spongy portion only 1.6–2.4 times its thickness and with the sheaths gently incurved, usually touching to overlapping; scape at fruiting c. 47–103 cm long, 2.5–12.6 mm diam.; infructescence 7–21 cm long, 15–24 mm diam.; fruits c. 44–137 per infructescence, touching, very distinctive, very broadly obovoid with the base contracted and stalk-like and with a squat summit, 7–9.6 mm long, 5.5–8.2 mm diam.; carpels 6 (occasionally 5), normally all maturing; mature carpels ventrally attached along 58–70% of the carpel length, never twisted, each more or less triangular in cross-section with the dorsal surface flat or shallowly indented, rarely shallowly convex, ridges absent. Fruits (Aug.–)Nov.–Apr.(–May).

EGL, EGU, GipP. Also Qld, NSW. Common in fresh, still or slow-flowing water to 50(–120) cm deep, in small creeks, swamps and farm dams. Also in stagnant water that is often highly eutrophic and humic from farmland runoff.

The more or less distinctive, cylindric shape of the lower leaf (below the sheath summit) occurs also in the East Gippsland variant of Cycnogeton procerum.

Created by: Andre Messina, 2014-07-22
Updated by: Val Stajsic, 2019-02-11
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Alismatales
family Juncaginaceae
genus Cycnogeton
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Cycnogeton microtuberosum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Cycnogeton microtuberosum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Gippsland Plain present native
East Gippsland Lowlands present native
East Gippsland Uplands present native

State distribution

Distribution map
New South Wales