Leaves opposite, subsessile, lanceolate, 5~ 12 cm long, acuminate, with acute points between them, inconspicuous veins, smooth on both sides; Stipules triangular, connate at the base, 3~5 mm long, entire or denticulate at the upper part. Cymes are terminal, often arranged in panicles or corymbs; Branches are angular or winged, with small bracts with wide spreading surface; Flowers 4 in number, sessile; Calyx tube gyroscopic.
Distributed in Guangdong, Hainan, Hong Kong, Guangxi, born in hillsides and bushes. Produced in Guangdong, Hainan and Hong Kong; Born on low-altitude slopes or open fields. This species is very common in Guangdong and Hong Kong, but it is only found in Wanning County in Hainan with few plants. Abroad in Vietnam.