信宜石竹 xin yi shi zhu

Culms 4–5 m, 2–2.5 cm in diam., basally nearly straight, apically slightly drooping; internodes 25–30 cm, initially thinly white powdery, several lower internodes striped yellow-green; wall thick; nodes slightly prominent; basal ca. 3 nodes with rings of gray-white silky hairs below and above sheath scars; usually branching from 3rd or 4th node up. Branches many, clustered, nearly horizontal, central dominant. Culm sheaths deciduous, initially yellow-green striped, glabrous or with stiff, brown hairs near inner margin and base, apex subtruncate; auricles unequal, larger auricle nearly 2.5 × as large as smaller one, broadly elliptic or elliptic, ca. 2 × 1.3 cm, wrinkled; oral setae undulate; ligule 1.5–2 mm, margin ciliate; blade deciduous, erect, triangular to narrowly triangular, base slightly rounded extending outward to join auricles for 6–7 mm, nearly 3/5 as wide as sheath apex. Leaf blade linear-lanceolate, 8–15 × 0.9–1.3 cm, abaxially densely pubescent, adaxially glabrous. Inflorescence unknown.

* Slopes, around villages. Guangdong (Xinyi).

Bambusa subtruncata is similar to the Chinese form of B. longispiculata, but differs in its truncate culm sheath apex with larger, broadly elliptic or elliptic auricles, 1.5–2 mm ligules, and narrower blade base, only 3/5 as wide as the sheath apex.