Citation: R. Br., Prod. Fl. Nov. Holl. 457 (1810).

Synonymy: Limnanthemum styglum J. Black, Trans. R. Soc. S. Aust. 42:52, t. 6 (1918); Nymphoides stygia (J. Black)H. Eichler, Taxon 12:296 (1963); V. exaltata sensu J. Black, Fl. S. Aust. 459 (1926), partly, non (Sol. ex Sims)Don.

Common name: Running marsh-flower.

Description:
Robust perennial to 120 cm high; stolons to 2 m long; petioles of the basal leaves to 68 cm long; leaf blades on plants in water floating, glossy-green above, paler or purplish and dotted beneath, ovate to circular or reniform, entire or rarely crenate-dentate, usually deeply cordate, 3-8 rarely 12 cm long; blades of stranded plants erect and less dorsiventral.

Inflorescence an erect open panicle near the summit of the flowering stem; pedicels of the mature capsules 7-25 rarely to 37 mm long, erect; calyx 6.5-12mm long; corolla 19-43 (average 32) mm diam., yellow; corolla lobes usually 5 sometimes 4 or 6, with broad entire to crenulate wings, not keeled; stigmas 2, fleshy and papillate.

Capsule 6-12 mm long, more or less equal to the calyx; seeds ellipsoid to almost globular but strongly laterally compressed, many, 0.7-1.9 but usually 1-1.5 mm long, straw-coloured to light-brown, smooth, without a caruncle.

Published illustration: H. I. Aston (1973) Aquatic plants of Australia, fig. 48.

Distribution:  Typically an aquatic in still fresh water to 60 cm deep in permanent or near-permanent swamps, dying back when stranded; sometimes in temporarily inundated depressions.   N.S.W.; Vic.; Tas. Conservation status: native Flowering time: Sept. — May, but usually Oct. — March.

SA Distribution Map based on current data relating to specimens held in the State Herbarium of South Australia

Biology: No text

Taxonomic notes: The illustration and description of Limnanthemum styglum given by J. Black (1918 and 1926) are based on atypical depauperate material and are quite misleading.

Author: Not yet available