2. Silvianthus tonkinensis (Gagnepain) Ridsdale, Blumea. 24: 42. 1978.
线萼蜘蛛花 xian e zhi zhu hua
Quiducia tonkinensis Gagnepain, Bull. Soc. Bot. France 95: 33. 1948; Silvianthus bracteatus J. D. Hooker subsp. clerodendroides (Airy Shaw) H. W. Li; S. bracteatus subsp. tonkinensis (Gagnepain) H. W. Li; S. clerodendroides Airy Shaw.
Subshrubs, 1-2(-4) m tall, glabrous. Stems terete. Petiole 1-4(-7) mm, rugose when dry; leaf blade elliptic, ovate-elliptic, or sometimes broadly elliptic, large, (10-)15-25(-30) × 5-20 cm, drying papery, lateral veins (9 or)10(-16) pairs, joining in an intramarginal vein, slightly prominent on both surfaces when dry, base usually broadly cuneate, rarely slightly obtuse, or slightly decurrent, margin often shallowly dentate-incised, apex acute to shortly acuminate. Cymes 1-4 cm in diam.; peduncles usually shorter than 1 cm, sometimes to 5 cm; bracts linear, 4-6 mm. Flowers heterostylous. Pedicel ca. 3 mm. Calyx tube obconical, 2-3 mm; lobes linear, 9-11 × 1-1.5 mm, longitudinally veined, often obtuse. Corolla usually yellow or pale red, occasionally purplish red (based on literature); tube 1.2-1.3 cm, throat slightly expanded, outside glabrous, inside with soft hairs; lobes orbicular, 5-6 mm, inside papillose. Stamens inserted near middle of corolla tube; anthers ca. 4.5 mm. Style ca. 1.1 cm. Capsule purple at maturity, obconical, 6-9 mm in diam. Seeds black, 3-3.5 mm, white aciculate striate-rugose. Fl. Mar-Jul, fr. Oct-Dec.
Forests in valleys, streamsides in evergreen hillside forests; 900-1500 m. Yunnan [Laos, N Thailand, N Vietnam].
This species was confused with Silvianthus bracteatus by some authors.