Pentapterygium interdictum Handel-Mazzetti, Anz. Akad. Wiss. Wien, Math.-Naturwiss. Kl. 60: 186. 1923; Agapetes interdicta var. stenoloba (W. E. Evans) Sleumer; P. interdictum var. stenolobum W. E. Evans.

Shrubs 30–60 cm tall. Twigs sharply angled, 1–3 mm in diam., hirtellous or glandular setose. Leaves scattered; petiole 1–2 mm, glabrous; leaf blade elliptic, 2–4.5 × 0.8–2.3 cm, leathery, glabrous, secondary veins 8 or 9 pairs, base cuneate, margin slightly revolute, entire or only sparsely serrate near apex, apex acute or apiculate. Inflorescences racemose, 1–3(–7)-flowered; peduncle 4–7 mm. Pedicel 4–10(–13) mm, densely puberulous, sometimes intermixed scattered shortly glandular setose, apex slightly expanded. Calyx glabrous or sparsely pubescent; tube 3–4 mm, conspicuously 5-winged, sparsely pubescent; limb divided ca. 2/3; lobes narrowly ovate-triangular, 6–9(–10) mm, submembranous, apex acuminate. Corolla red, tubular, 2.2–3(–3.4) cm, 5-angled; lobes recurved, greenish, triangular-subulate, 6–9 mm. Filaments 4–5 mm, glabrous; anthers 2.2–2.6(–3.2) cm, thecae caudate at base, tubules (2–)4 × as long as thecae, without spurs. Berry unknown. Fl. Mar, fr. Aug.

Evergreen forests, epiphytic on trees; 2300–2700(–2900) m. SE Xizang, NW Yunnan (Dulongjiang) [Myanmar].