Branches up to 4 lin. in diam.; branchlets slender, brown or purplish-brown, finely striate, lenticellate, glabrous, about 1 1/2 lin. in diam. 1 ft. below the apex; internodes 4–6 in. long. Leaves opposite, broadly ovate or elliptic, shortly and abruptly acuminate to a slightly recurved acute apex, subcordate at the base, 2 1/4–5 in. long, 1 1/2–3 in. broad, thinly coriaceous, glabrous; lateral nerves 2–4 on each side, obliquely ascending, slightly raised on the upper surface, prominent on the lower; petiole 2–3 lin. long. Heads axillary, fascicled, about 4-flowered; peduncle 1–1 1/2 lin. long; bract obliquely cupular, solid base about 1/2 lin. long, dorsal margin 5/8 lin. long, ventral margin 1/4 lin. long. Receptacle and calyx together shortly campanulate, 1 1/2 lin. long. Calyx irregularly lobed, 1/2 lin. long. Corolla grey outside with red stripes, red inside (Preuss), or red and green (Ledermann), nearly 3 in. long in bud, apical swelling broadly 5-winged, basal swelling broadly ovoid, 3 1/2 lin. long, 2 1/2 lin. in diam., or oblong-ovoid; tube split unilaterally about 8 lin. down; lobes reflexed, broadly spathulate, 5 1/2–6 lin. long, upper part elliptic, 3 lin. long, 1 3/4–1 7/8 lin. broad. Filaments inflexed, tapering slightly upwards, about 3 lin. long, tooth 3/8– 1/2 lin. long; anthers oblong, emarginate, 1 1/4 lin. long. Disc sunk, pentagonal, 1/5 lin. high. Style skittle-shaped above, thickened part 3 3/4–4 lin. long, neck 1/2 lin. long; stigma obovoid, 5/8 lin. long.
