a perennial herb drying dark brown; stems prostrate and creeping or decumbent, much elongated, about 3/4 lin. thick or less, sparingly (rarely abundantly) furnished with usually very short recurved hook-like hairs callous at the base, often more or less scabrous, rarely rather densely puberulous or quite glabrous and smooth; branches ascending, otherwise similar to the stems; leaves ovate-triangular or sometimes ovate, 5–11 lin. long, 2 1/2–7 1/2 lin. broad near the base, subacute or obtuse, cordate at the base, with a deep open sinus and distant rounded auricles, regularly crenate or crenate-dentate, rather leathery, callous on the margin, quite glabrous or with few (rarely many) stiff hairs above and on the nerves beneath, sometimes with a few callosities or many stiff hairs callous at the base above, occasionally glandular-pulverulent beneath; midrib and primary lateral nerves rather thick and conspicuous beneath; petiole 1–4 lin. long, quite glabrous, or more or less pubescent; lower bracts similar to the leaves, the upper gradually smaller; whorls 2–6-flowered, lax, few or several, rather distant; calyx funnel-shaped-campanulate, 3 1/2–4 1/4 lin. long, somewhat sparingly covered with short stiff hairs, sometimes almost glabrous; teeth lanceolate or lanceolate-triangular, 1 1/2–2 1/2 lin. long, usually quite straight, acuminate-spinescent; corolla shortly pubescent outside; tube narrowly cylindric below, slightly enlarged above, 3–4 lin. long, annular-pilose inside; upper lip obovate or elliptic, 2 1/4–4 lin. long, recurved, emarginate; lower lip 3–5 lin. long. null
