Calycolpus warszewiczianus O. Berg: Shrub or tree 2–7 m high, mainly glabrous to sparsely strigose; hairs simple, whitish to reddish brown, to ca. 0.3 mm long; young twigs more or less terete to weakly 4 angled, glabrous-sparsely strigose, light reddish brown, the older twigs usually gray, the older bark often somewhat stringy; leaves elliptic, lanceolate, or oblong-lanceolate, 4–9 cm long, 1–3.6 cm wide, (1.7–) 2.5–3.5 times as long as wide; apex acuminate to acuminate-caudate; base rounded to acute; petiole shallowly channeled, 2–5 mm long, ca. 1 mm thick, glabrous to sparsely strigose; midvein impressed above, prominent below; lateral veins about 20–30 pairs, faint, nearly straight; marginal vein about equaling laterals, approximately paralleling the margin; blades subcoriaceous, drying dark reddish brown, somewhat darker above than below, dull above. Flower buds 8– 12 mm long; peduncles solitary or in collateral pairs, uniflorous (rarely triflorous), subterete to flattened, 0.6–2.5 (–3) cm long, ca. 1 mm wide; bracteoles subtriangular, 1–2 mm long, ca. 1 mm wide; calyx-lobes clearly divisible into base and appendage, normally with no tearing between the lobes at anthesis, the base truncate-arcuate, 1–2.5 mm long, 3.5–4 mm wide, usually densely appressed puberulent within, the appendage oblong, elliptic-oblong, to subtriangular, 5–8 mm long, 3–5 mm wide, glabrous to sparsely strigose; petals obovate to suborbicular, 1.5–2.2 cm long, 1–1.3 cm wide, strongly glandular and pinkish without, scarcely glandular and whitish within, drying brownish, subglabrous or pubescent basally within, the margin ciliate; hypanthium campanulate, 3.3– 4.5 mm long, sparsely strigose to glabrous; disk 4–5 mm across, moderately strigose to glabrous; stamens 110–140, 6–12 mm long; anthers 1.5–2.5 mm long, with ca. 60–90 glands; style 8–10 mm long, glabrous; ovary 5–6-locular; ovules ca. 29– 40 per locule, multiseriate on a bilamelate-subpeltate placenta; fruit subglobose, ca. 0.8–1.5 cm wide; seeds 36–80 in fruits seen, subreniform with a darkened center, ca. 2.5–3 mm long.