8. Cystacanthus colaniae (Benoist) Y. F. Deng, Fl. China. 19: 477. 2011.
广西火焰花 guang xi huo yan hua
Basionym: Phlogacanthus colaniae Benoist, Notul. Syst. (Paris) 5: 109. 1936.
Shrubs to 1 m tall. Stems terete, pubescent, soon glabrescent. Petiole 1-5 cm, puberulent; leaf blade ovate to ovate-lanceolate, (5-)12-30 × (2-)5-12 cm, abaxially slightly pubescent, adaxially glabrous or puberulent along veins, secondary veins 8-17 on each side of midvein, base shortly attenuate, margin entire or slightly crenate, apex shortly acuminate. Thyrses 10-20 cm; cymes few flowered; bracts triangular, 1.5-2 × 0.7-1 mm, pubescent; bracteoles linear, ca. 1 × 0.5 mm, pubescent. Pedicel 1-2 mm, pubescent. Calyx ca. 3 mm, pubescent; lobes linear. Corolla ca. 1.2 cm, ventricose, bent to 90º and abruptly inflated at middle, outside slightly grayish white pubescent, inside pubescent on lobes; lobes oblong-ovate, ca. 5 × 3 mm, unequal, apex acute. Stamens 2; filaments hirsute at base, ca. 6 mm; anther thecae oblong, ca. 2 mm, connective black and glabrous; staminodes filiform, very short, hirsute. Ovary oblong, ca. 2 mm, glabrous; style ca. 8 mm, glabrous; stigma slightly 2-cleft. Capsule 1.8-2 cm, glabrous. Seeds ovate in outline, ca. 2.5 × 2 mm.
Limestone hills; 200-500 m. Guangxi, Hainan, Yunnan [Vietnam].