Citation: Bosch, Prod. Fl. Batav. 1:7 (1850).

Synonymy: Ranunculus trichophyllus Chaix in Villars, Hist. Pl. Dauph. 1:335 (1786); R. aquatilis sensu J. Black, Fl. S. Aust. 363 (1948), non L.

Common name: Water buttercup.

Description:
Annual or perennial aquatic herb; stems hollow, rooting at the lower nodes; leaves repeatedly trichotomously divided into capillary segments; lobed leaves absent; stipules oblong to ovate, adnate to petiole for two-thirds or more of their length; petiole up to 4 cm long, usually much shorter; lamina globose to obconical, 1.5-4.5 cm long; segments rigid or flaccid, divergent in more than one plane.

Pedicels in fruit 1-5 cm long, placing the flowers above the water surface, usually recurved after flowering; sepals 2.5-3.5 mm long, greenish and blue-tipped, spreading, caducous; petals ovate to obovate, 3.5-5.5 mm long, not contiguous during anthesis; nectary-pit lunate; stamens 9-15; carpels 16-33, hairy when immature, occasionally glabrous when mature; style subterminal.

Achenes 1.5-2 mm long, ovoid to obovoid, beak very short; torus globular, hairy.

	Batrachium trichophyllum twig, leaf, petal and fruits.
Image source: fig 195b in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Published illustration: Ross-Craig (1948) Drawings Brit. Pl. 1:pl. 13.

Distribution:  In S.Aust. in fresh-water ponds and slow streams.   N.S.W.; Vic.; Tas.   Native to Europe, Asia and central North America; probably introduced in Australia. Conservation status: naturalised Flowering time: Oct. — Jan.

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

Biology: No text

Author: Not yet available