Nasturtium rivulorum Dunn, J. Linn. Soc., Bot. 38: 354. 1908; Cochlearia formosana Hayata; C. rivulorum (Dunn) O. E. Schulz; Hilliella alatipes (Handel-Mazzetti) Y. H. Zhang & H. W. Li var. micrantha Y. H. Zhang; H. formosana (Hayata) Y. H. Zhang & H. W. Li; H. rivulorum (Dunn) Y. H. Zhang & H. W. Li; Yinshania formosana (Hayata) Y. Z. Zhao.

Annuals, 8-50 cm tall, glabrous throughout. Basal and lowermost cauline leaves trifoliolate, rarely 1 simple; petiole 4-10 cm, gradually shorter upward, not winged; leaflet blade ovate, oblong, or rarely lanceolate, 1-5 × 0.8-3 cm, papery, base cordate, rounded, or cuneate, margin repand or rarely sinuate-toothed, with conspicuous callose mucros terminating veins, apex obtuse or acute; petiolule 2-12 mm, longer on terminal leaflet. Upper leaves similar to lower ones, becoming simple at the inflorescence. Racemes lax, ebracteate; rachis straight. Fruiting pedicels 6-10 mm, slender, straight, reflexed. Sepals 1-2 mm. Petals white, obovate, 1.5-2.5 mm, minutely clawed. Filaments white, 1-2 mm; anthers ca. 0.2 mm. Fruit oblong, 3-6 × ca. 1.5 mm, papillate when immature; septum absent; style 0.5-0.8 mm. Seeds 7-10, oblong, 0.8-1 × ca. 0.5 mm. Fl. and fr. Apr-Dec.

* Shady river banks, mountain slopes; 300-800 m. Fujian, Hunan, Taiwan.