Marsilea exarata

Marsileaceae

Marsilea exarata A.Braun

Link to Australian Plant Name Index for publication details and synonyms: https://id.biodiversity.org.au/name/apni/104768

Swayback Nardoo

Rhizome long-creeping, much branched, glabrescent, bearing nodal roots and peltate apical scales. Fronds 1–10 cm long, solitary or clustered. Stipes glabrous or scaly. Leaflets broadly obovate to broadly cuneate, 1–13 mm long, 2–8 mm wide, often arranged unequally in pairs, glabrous to densely scaly; outer margin rounded, entire to crenate. Sporocarps solitary; stalks 1–3 mm long, unbranched, glabrous to scaly; conceptacles 4–5 mm long, scaly, ribbed; upper surface flat to concave; upper basal tooth broadly triangular; lower basal tooth of similar size but narrower and often recurved. 

Endemic to inland areas of WA, NT, SA, QLD and NSW.

Aquatic or terrestrial herb that grows in shallow water or drying mud.