Large Flowered Selfheal

Stems ascending, 15-60 cm, villous-hirsute. Petiole 2.5-4 cm, hispid; leaf blade ovate-oblong, 3.5-4.5 × 2-2.5 cm, sparsely hirsute, abaxially subglabrous, ciliolate, base subrounded, margin entire, apex obtuse. Spikes ca. 4.5 cm, oblong, pedunculate; floral leaves sessile, oblong-lanceolate; bracts numerous, mucronate, sparsely villous on veins. Pedicel ca. 1 mm. Calyx ca. 8 mm, veins sparsely hirsute, tube ca. 3 mm; upper lip subcircular, ca. 5 × 5 mm, subrounded, with teeth broadly triangular, spinescent, lateral teeth longer; lower lip oblong, ca. 6 × 3 mm, with teeth lanceolate, spinescent. Corolla blue, 2-2.7 cm, tube ca. 9 mm, curved; upper lip oblong, ca. 12 × 7 mm, recurved; middle lobe of lower lip undulate-lobulate; lateral lobes pendulous. Nutlets subglobose, slightly tuberculate, back and margin conspicuously grooved. Fl. Sep, fr. Oct.

Cultivated in Nanjing [C and W Asia, Europe].

Prunella vulgaris Linnaeus var. grandiflora Linnaeus, Sp. Pl. 2: 600. 1753; P. grandiflora (Linnaeus) Moench.