Didymocarpus longicalyx G.W. Hu & Q.F. Wang
Didymocarpus Wall.  Perennial lithophytic herbs. Stems 1.5–9 cm tall, densely puberulent with white spreading hairs. Leaves 2–3 pairs, opposite and decussate, whorled at the top of the stem; petiole 0.5–4 cm long, densely puberulent; blade thick herbaceous, elliptic, 2–10 × 1–5...