Oxalis natans Thunb.

A water plant. Bulb ovoid, often 1 cm long, with smooth blackish-brown tunics. Stem slender, flexuous, sometimes branching, with several amplexicaul scales. Leaves fairly numerous, rosulate, floating, at the apex of the stem or branches, often a few on abortive branches; petioles up to 1 cm long, sparsely pilose, with membranous stipuliform wings at the base; leaflets 3, sessile, rather widely obcordate, slightly incised, the medial 0.6-1.2 cm long, 0.4-1 cm broad, the lateral rather smaller, glabrous above, sometimes very sparsely pilose about the mid-rib beneath, often more or less punctate with small orange calli. Peduncles 1-fld., terminal, often about 1 cm long, glabrous, bibracteate below the middle. Sepals ovate or ovate-oblong, 3.5-4.5 mm long, glabrous, with 2 or sometimes 3-4 elongate orange calli near the apex. Corolla white, 1-1.4 cm long, with a broadly campanulate yellow tube; petals cuneate, scarcely attenuate below, obliquely subtruncate at the apex. Filaments glabrous, the shorter 1.5-2.5 mm, the longer 2.5-4 mm long, with short broad prominent teeth. Ovary sometimes pubescent near the apex, the chambers 1-2-ovuled; styles glabrous or minutely pubescent. Seeds without endosperm.