Description from Flora of China
Plants perennial. Stems erect, 17-55 cm, pubescent or subglabrous. Leaves basal; petiole longer than blade, rarely shorter; leaf blade ovate to elliptic, 3-9.5 × 2-6 cm, abaxially purple, glandular, finely pilose on veins, margin coarsely crenate. Inflorescence densely fine pilose; verticillasters 4-6-flowered, widely spaced, in racemes or panicles 8.5-16 cm; bracts lanceolate, purplish. Pedicel 1-2 mm. Calyx purple-red, tubular, 5-7 mm, sparsely pubescent glandular, tube 4-6 mm; upper lip broadly triangular to subtruncate, apex entire or 3-denticulate; lower lip slightly longer than upper, teeth triangular. Corolla purple or dark red, 8-10 mm, pilose; tube pilose annulate inside; upper lip oblong, ca. 2.5 × 2 mm, slightly falcate; lower lip ca. 4 × 6 mm, lateral lobes circular, ca. 1 mm wide. Filaments ca. 1 mm; connectives slightly curved, ca. 6 mm, lower arms with a membranous subulate appendage at junction. Nutlets brown, oblong, ca. 2 mm. Fl. May.
Characterized by the subulate appendage at the junction of connective and filament.
* Open streamsides, thickets, forests. Guangdong