Pollia secundiflora (Blume) Bakh. fil.

Pollia siamensis has been considered conspecific with P. secundiflora. However, the two species seem distinct in Chinese material.

Herbs perennial. Stems erect, to 20 cm × 7 mm, sparsely white-pubescent. Leaves sessile; leaf sheath ca. 2.5 cm, rather densely pubescent; leaf blade elliptic, ca. 20 × 5 cm, verrucose adaxially, densely puberulent abaxially. Inflorescence longer than distal leaves; proximal inflorescence branches with peduncle to more than 20 cm, densely brown-yellow hooked hirsute; cincinni numerous, ca. 2 cm, in whorls or not, densely brown-yellow hooked hirsute; proximal involucral bracts leaflike, nearly as large as leaves, distal ones much smaller, to 5 mm, densely brown-yellow hirsute; bracts membranous. Sepals ovate-orbicular, boat-shaped, ca. 3 mm, glabrous, persistent. Petals white, obovate, shallowly boat-shaped, ca. 5 mm. Stamens 6; fertile stamens 3, anterior; staminodes 3, with shorter filaments. Fruit globose, ca. 6 mm in diam. Fl. Apr.

Herbs perennial. Stems erect or ascending, 30--100 cm × 4--10 mm, glabrous or subglabrous. Leaves with petiole 2--4 cm; leaf sheath 2--4 cm, glabrous or sparsely puberulent; leaf blade elliptic to narrowly ovate, 10--25 × 2.5--8 cm, glabrous or subglabrous adaxially, glabrous or nearly so abaxially. Inflorescence nearly as long as distal leaves; peduncle 5--10 cm, densely glandular with short hairs; cincinni numerous, 2--4 cm, usually alternate, sometimes partly in whorls, densely glandular with short hairs; proximal involucral bracts leaflike, but much smaller than leaves, distal ones lanceolate, only ca. 10 mm, densely glandular with short hairs; bracts membranous, often persistent. Sepals ovate-orbicular, boat-shaped, ca. 3 mm, glabrous. Petals white, ovate-elliptic, shallowly boat-shaped, ca. 4 mm. Stamens 6; fertile stamens 3, anterior; staminodes 3, with shorter filaments. Fruit globose, ca. 5 mm in diam. Fl. Apr--Aug.

SW Guangxi (Longzhou Xian, Pingxiang Shi), Hainan, S Yunnan [Indonesia, Laos, New Guinea, Philippines, Thailand, Vietnam].

Forests or humid sandy soils; near sea level to 1200 m.

Dense forests on low mountains. NE Guangxi (Longsheng Ge Zu Zizhixian), S Guizhou, Hainan, Hong Kong, EC Hunan (Nanyue), S Yunnan (Jinping Xian) [India, Indonesia, Laos, Malaysia, Myanmar, Thailand, Vietnam].

Commelina secundiflora Blume, Enum. Pl. Javae 1: 3. 1827; Aclisia gigantea Hasskarl; A. indica Wight; A. sorzogonensis E. Meyer; Pollia sorzogonensis (E. Meyer) Endley.

Aneilema siamense Craib, Bull. Misc. Inform. Kew 1912: 415. 1912.