Bambusa subtruncata

Thai name: ไผ่หินซิ่นหยี (phai hin sinyi).

Chinese name: 信宜石竹 (xin yi shi zhu); the Chinese name translates as "Xinyi Stone Bamboo"; Xinyi is the name of a district in Guang­dong Province where this bamboo occurs.

English name: Xinyi Stone Bamboo.

Distribution: THAILAND: introduced, in cultivation, rare. — CHINA (South): Guangdong, on slopes around villages.

Descriptions:

(1) "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." — Flora of China [#1303].

(2) Kew GrassBase [#1335].

(3) "Culms 4–5 m tall, 2–2.5 cm diameter, basally nearly straight, apically slightly drooping; internodes 25–33 cm long, glabrous, initially slightly white waxy, green, basal ones typically with yellow stripes; wall ca. 7 mm thick; basal nodes with grey-white sericeous ring-like zones below and above sheath insertion. Primary branch bud broadly ovate, prophyll margins apically ciliate. Branch complement at mid-culm with many branches, central 3 branches dominant, those at culm base without thorny branchlets. Culm leaf sheath initially green with yellow stripes, glabrous or brown hispid especially near margins, apex subtruncate; auricles unequal, larger one about 2.5 times as large as smaller one, moderately to broadly elliptic, ca. 2 cm long, ca. 1.3 cm wide, wrinkled, margins with undulate bristles; ligule 1.5–2 mm high, margin ciliate; blade caducous, erect, triangular to narrowly triangular, base slightly rounded, overlapping with auricles for 6–7 mm, about 3/5 as wide as sheath apex. Foliage leaf sheath glabrous; auricles subovate or tiny, margin with undulate bristles; ligule low, entire; blade linear-lanceolate, 8–15 cm long, 0.9–1.3 cm wide, abaxial surface densely pubescent, adaxial surface glabrous. … [flowers described]." — Q. M. Qin & al., 2022: 154-157 [#1377].

Images: Line drawing in Flora of China [#1303]. Photos and line drawings in Q. M. Qin & al., 2022: fig. 7-8 [#1377].