4. Strobilanthes fluviatilis (C. B. Clarke ex W. W. Smith) Moylan & Y. F. Deng, Bot. J. Linn. Soc. 150: 389. 2006.
溪畔黄球花 xi pan huang qiu hua
Hemigraphis fluviatilis C. B. Clarke ex W. W. Smith, Notes Roy. Bot. Gard. Edinburgh 10: 182. 1918; Sericocalyx fluviatilis (C. B. Clarke ex W. W. Smith) Bremekamp.
Herbs to 20 cm tall, isophyllous. Stems decumbent, hirsute, basally woody. Petiole 1-5 mm, coarsely pilose; leaf blade oblong, narrowly oblong-elliptic, or elliptic, 1.5-5 × 1-1.5 cm, abaxially subglabrous to thinly but coarsely pilose with pustulose trichomes, adaxially darker green with prominent linear cystoliths and glabrous or strigose-pilose, secondary veins 4 or 5 on each side of midvein, base cuneate, margin crenulate, apex obtuse. Inflorescences terminal, spikes, ca. 2.5 cm; bracts oblong, 1-1.5 cm, persistent, pilose, base cuneate, apex obtuse; bracteoles narrowly linear-elliptic, ca. 7 × 1 mm, pilose. Calyx ca. 8 mm, pilose, subequally 5-lobed almost to base; lobes linear, apex acute. Corolla yellow, 0.9-1.1 cm, glabrous; tube basally cylindric and narrow for ca. 3 mm then gradually widened to ca. 3 mm at mouth; lobes orbicular, ca. 2 mm in diam., spreading. Stamens 4, included; filaments with a few scattered trichomes, shorter pair ca. 1 mm, longer pair ca. 2 mm; anther thecae oblong; pollen type 6. Ovary oblong, comose; style glabrous or with a few trichomes. Capsule oblong, ca. 8 mm, comose, 8-14-seeded. Seeds ca. 0.8 mm, pubescent; areola large. Fl. Feb-May.
Along streams on rocks; 200-800 m. Guangxi, Guizhou, Yunnan [Myanmar, Thailand].