We describe and illustrate a new species, Raphiocarpus hapii, recently discovered in central Vietnam. It resembles R. sinovietnamicus but differs in dwarf habit, 20–30 (rarely 50) cm tall, spreading hirsute stems and leaves, shorter corolla, 1.5–1.8 cm long, with a tubular corolla tube, which is pale greyish-pink to dusky greyish-purple, tinged with maroon externally, and white with maroon to crimson internally, having scattered pilose hairs on the lower corolla mouth, and in shorter capsule, 1.8–2.5 cm. According to the IUCN criteria (2024), the new species may tentatively be assessed as Data Deficient (DD).
Нгуен et al. (Thu,) studied this question.