Pseuderanthemum polyanthum (C.B. Clarke ex Oliver) Merrill, Brittonia 4: 175 (1941)

Latin for 'many flowers'.

Eranthemum polyanthum C.B. Clarke ex Oliver

Herbs. Leaves opposite; petiole ca. 2.5 cm; leaf blade broad ovate to oblong, glabrous, 7--17 X (3--)4--9 cm, secondary veins 7--9 on each side of midvein, base cuneate and decurrent, margin entire, apex acute. Spikes composing of cymes; bracts triangular, 3.5--4 X ca. 1.5 mm. Bracteoles ca. 2 X 0.5 mm. Calyx ca. 1 cm, 5-divided; segments lanceolate. Corolla bluish purple, 2-lipped; tube 3--3.5 cm; lobes of abaxial lip 3, oblong, ca. 1.5 X 0.6 cm; lobes of adaxial lip narrow, ca. 11 X 3 mm. Stamens 2; filaments free, short, inserted at throat; anthers parallel, equal level, apex obtuse.

In forest understoreys. Often on limestone soils.

India and southern China, Indochina and western Malesiana?

Local names
China: Duo hua shan qiao gu.