Young branches slender, blackish, slightly compressed towards the apex, soon becoming terete, adult ones terete, greyish, minutely lenticellate, 1 3/4 lin. in diam. 1 ft. below the apex; internodes 3/4–2 in. long. Leaves opposite, ovate-elliptic, obtuse or rounded at the apex, subcordate, rounded or obtuse at the base, 2 1/2–3 1/4 in. long, 1 1/4–2 1/2 in. broad, thinly coriaceous, glabrous; lateral nerves 4–5 on each side, patulous, anastomosing far from the margin, slightly raised on both surfaces; petiole 2–3 lin. long. Umbels axillary, fascicled, 10–14-flowered; peduncle slender, 1/2–1 1/2 in. long; pedicels 1 1/2–2 1/4 lin. long; bract shortly and broadly boat-shaped, 1 1/8–1 1/4 lin. long, rounded or retuse, sparingly ciliolate, very thickly keeled, keel horned above, horn 1/6– 1/4 lin. long or less, ventral margin saucer-shaped, 1/6 lin. long. Receptacle and calyx together cupular, 7/8–1 lin. long. Calyx subtruncate, 1/4– 1/3 lin. long, intramarginal ring 1/10 lin. high. Corolla 1 1/2–1 2/3 in. long, with an oblong-ellipsoid pentagonal apical swelling in bud; tube rose-madder with darker lines, basal swelling slight; lobes spathulate, 5 1/2 lin. long. Filaments tapering upwards, 4 lin. long, tooth 1/3 lin. long; anthers oblong, 1 1/8 lin. long; connective slightly produced beyond the cells. Disc not distinctly lobed, 1/5 lin. high.
