急流马蓝 ji liu ma lan

Subshrubs to 1 m tall, isophyllous or slightly anisophyllous. Stems dark green, erect, 4-angled, sulcate, bifariously pubescent. Petiole 0.5-3 cm, pubescent and slightly hispid; leaf blade ovate to elliptic, 3-13 × 1.5-5.5 cm, abaxially densely yellow pilose along veins, adaxially sparsely pubescent, hispid, and with numerous cystoliths, secondary veins 5-7 on each side of midvein, base narrowly cuneate and decurrent onto petiole, margin serrate, apex acuminate and slightly falcate. Inflorescences axillary or terminal, headlike spikes, 1.5-3 cm, very compact, densely covered with long silky rufous trichomes; bracts imbricate, somewhat variable in size and shape; outer bracts leaflike, obovate to subrhombic, 1.5-1.7 × 0.5-0.7 cm, distinctly angled, densely villous, apex acute; inner bracts obovate, ca. 10 × 5 mm, angled, villous, apex subacute; bracteoles oblanceolate, ca. 7 mm, margin ciliate, apex obtuse. Calyx 1-1.1 cm, villous, 5-lobed to ca. 3 cm from base; lobes linear-oblong 7-8 × ca. 1 mm, with 2 slightly shorter than others, margin ciliate, apex obtuse. Corolla with a white tube and blue to mauve lobes, 3-4.5 cm, curved, outside sparsely pubescent on tube and on lobes, inside glabrous except for trichomes retaining style; tube basally cylindric and narrow for 8-10 mm then gradually widened to 1-1.2 cm at mouth; lobes ovate, ca. 3 × 5 mm, apex obtuse. Stamens 4, included; filaments pilose, shorter pair ca. 2 mm, longer pair ca. 5 mm; anther thecae oblong, ca. 2.5 mm; pollen type 3. Ovary villous; style ca. 3.3 cm, basally glabrous, apically pubescent. Capsule oblong, ca. 9 mm, pilose at tip, 4-seeded. Seeds unknown. Fl. Aug-Nov.

Forests by streams; 1900-2300 m. Yunnan [India, Myanmar].