Lamium purpureum

Annual herb; branches often red-tinged, weakly to moderately decurved-pubescent. Leaves broadly ovate, 1–5 cm long, 1–3 cm wide, surfaces pilose, apex obtuse to rounded, base usually cordate, margin crenate to serrate; petiole 1–4 cm long (but often very reduced on bracts). Lower internode(s) of inflorescence usually apparent, upper ones usually obscured; flowers mostly 5–8 per bract. Calyx 10–15-veined, 5–7 mm long, with short, stiff hairs mostly along veins and margin, lobes 3–4.5 mm long; corolla 10–20 mm long, reddish-purple with paler spots on abaxial lip, tube longer than calyx, corolla-lips shorter than tube, median lobe of abaxial lip narrowly spathulate, lateral lobes broad and scarcely distinct, adaxial lip bilobed. Flowers Aug.–Oct.