Stems numerous, prostrate, ascending or erect, 5–6 1/4 in. long, scabridly pubesscent especially towards the base and on the young parts, furnished with scarious bracts at the base; internodes 5–7 1/2 lin. long. Leaves sessile, opposite or subopposite, oblong or oblong-lanceolate, 1–3 in. long (the middle ones usually longest), 1/4–1 in. broad, long-cuneate at the base, almost petiolate, crenate-serrate, prominently nerved, with scattered hairs more numerous on the under side, especially on the nerves, scabrid. Flowers solitary or in pairs, slightly supra-axillary. Pedicels 2–6 1/2 lin. long; bracteoles linear, 2 1/2–3 lin. long, entire or 2-toothed, attached under the calyx or sometimes united more or less to it. Calyx tubular, 1 1/2–2 in. long, with scattered hairs, scabrid; lobes triangular, 1 3/4–5 lin. long, acute or subacute. Corolla at first white, soon turning clear blue, at length violet; tube 2 1/4–3 in. long, narrow, straight, glandular-pubescent outside; lobes obovate, about 14 lin. long, the upper about twice as broad as the others and slightly bilobed at the apex. Ovary ovoid, glabrous, compressed.
