4a. Hedyotis auricularia var. auricularia
耳草(原变种) er cao (yuan bian zhong)
Exallage auricularia (Linnaeus) Bremekamp; Oldenlandia auricularia (Linnaeus) K. Schumann.
Stems densely hirtellous, hispidulous, strigillose, pilosulous, or puberulent to glabrescent with pubescence mostly uniform. Leaf blade lanceolate to elliptic, 2.2-9 × 0.6-3 cm; secondary veins 4-6 pairs; stipules with 3-9 linear to setiform lobes to 5 mm. Inflorescences glomerulate to congested-cymose, several to many flowered; pedicels to 1 mm. Fl. and fr. Mar-Dec.
Forest margins, thickets, grasslands; below 100-1500 m. Guangdong, Guangxi, Guizhou, Hainan, Yunnan [India, Japan (Ryukyu Islands), Malaysia, Myanmar, Nepal, Philippines, Sri Lanka, Thailand, Vietnam; Australia].
The Chinese range of this taxon was not mentioned by Dutta and Deb (Taxon. Rev. Hedyotis. 2004) but was long known to other authors.