Hapsurotala

Herbs, perennial, to 30 cm, aquatic with emergent inflorescence, amphibious, or terrestrial. Stem solitary, rarely branched, slender. Leaves whorled; aerial leaves 3-12-whorled, linear to oblong, apex obtuse or 2-cleft; submerged leaves typically more numerous, filiform, distinctly longer than aerial leaves, 1.5-2.5 cm, apex 2-cleft. Bracts much reduced in inflorescence, oblong or ovate, 2-3 mm. Flowers 5-8-whorled per node, shortly pedicellate in a bracteate raceme; bracteoles short, less than 1/2 length of floral tube. Floral tube 4-merous, campanulate, translucent, ca. 1.5 mm; sepals 4; epicalyx absent. Petals 4, showy, light red or pink, orbicular, longer than floral tube. Stamens 4; anthers reaching margin of floral tube. Ovary globose, ca. 1 mm in diam.; style included, shorter than ovary. Capsules globose, ca. 1 mm in diam., 2-valved. Seeds ca. 0.7 mm. Fl. and fr. autumn and winter.

Ponds, wet places. Guangdong, Taiwan (Pingdong) [India, Indonesia, Malaysia, Myanmar, Thailand, Vietnam].

Hydrolythrum wallichii J. D. Hooker in Bentham & J. D. Hooker, Gen. Pl. 1: 777. 1867; Ammannia myriophylloides Dunn; A. wallichii (J. D. Hooker) S. Kurz.

Rotala wallichii là một loài thực vật có hoa trong họ Lythraceae. Loài này được (Hook. f.) Koehne miêu tả khoa học đầu tiên năm 1881.

瓦氏水猪母乳（学名：Rotala wallichii）为千屈菜科水猪母乳属下的一个种，又可稱為紅松尾。