Bambusa duriuscula
Bambusa duriuscula W. T. Lin, Bull. Bot. Lab. N. E. Forest. Inst., Harbin 1980 (6), 1980: 87.
Synonym: Bambusa breviligulata L. C. Chia & H. L. Fung.
Thai name: No known records.
Chinese name: 蓬莱黄竹 (péng lái huáng zhú).
Distribution: THAILAND, Plants were introduced from Hainan in 2013, which are considered to represent this species; in cultivation, rare. — CHINA (South): Hainan, in cultivation.
Description: "Culms suberect, 6–7 m, 3–4 cm in diam.; internodes straight, 38–55 cm, sparsely stiffly dull brown hairy, initially partly white powdery below sheath scar but powder not in rings; wall slightly thin; nodes flat, glabrous; branching from 5th or 6th node up. Branches many, clustered, horizontal, central slightly dominant. Culm sheaths deciduous, glossy, abaxially and near margins ± stiffly dull brown hairy, apex subtruncate; auricles subequal, narrowly oblong, ca. 1.5 × 0.6–0.7 cm; oral setae undulate; ligule ca. 1 mm, erose, very shortly ciliolate; blade deciduous, erect, ovate-triangular, nearly as long as or slightly shorter than sheath, base ca. 2/3 width of sheath apex. Leaf blade linear, 9–14 × 0.8–1.2 cm, abaxially subglabrous, adaxially pubescent near base. … [flowers described, seeds unknown]." — Flora of China, accessed 22 Aug. 2020 [#1303].
Images: Line drawing in Flora of China [#1303].
Uses: Plants for hedges and screening.
Cultivation requirements: Easy and fast-growing; in part shade to full sun, soils of sandy loam to clay loam, normal moisture-retentive to moist with good drainage.
Bambusa cf. duriuscula
Bambusa cf. duriuscula (BS-0107): Culm-leaf when young (left), abaxial side of culm-leaves when dry (center), adaxial side (right)
Specimen: BS-0107 [E3] (living plant), Hainan, China, cult., received from M. S. as "Bambusa sp.", 23 June 2013.
Characteristics: Habit tight caespitose. Rhizome pachymorph, short. Culms straight, erect or slightly slanted, slightly bending above, over 5 m tall. Young shoots light green, conical; emerge from April to September. Culm-internodes terete, 35 (45–52 (62) cm long, dark green, dull, glabrous, scaberulous, not farinose; diameter 2–3.5 (4.0) cm; walls 0.4 cm by 1.8 cm in diameter at 0.4 m above the ground. Culm-nodes glabrous, not or slightly prominent; sheath scar marginally protruding 0.5–1 mm; supranodal line obscure, without a ridge, 4–6 mm above the nodal line; with a thinly white farinose ring below and above the sheath scar when young; aerial roots none. Branch-buds solitary, subrotund, pointed, from the basal node up. Branches several, the central one dominant, 2 side branches subdominant, and smaller branches; the first 3–4 (8?) nodes of the basal and lower culm unbranched; branching intravaginal; rebranching. Culm-leaves early deciduous. Culm-leaf sheath 9.5 cm wide at the base, 12.5 cm long, less than 1/3 of the internode length, rigid, light green to light orange-brown when young, light straw-colored when dry, with short appressed black hairs near margins; margins eciliate; apex subtruncate, slightly convex. Culm-leaf auricles subequal lobes, about 1 cm wide and 0.6 cm high, glossy dark brown when young, light straw-colored but slightly darker than sheath when dry; with short, up to about 10 mm long undulate pale bristles. Culm-leaf ligule about 1 mm high, entire. Culm-leaf blade papery, glabrous, usually persistent, stiffly erect; triangular, with rounded basal edges, the edges marginally overlapping the auricles; 3.3 cm wide near the base, 7.5 cm long (shorter on the basal culm), 3.0 cm wide at the junction with the sheath; light green to light orange-brown when young, of the same color as the sheath when dry; apex pointed; margins short pale ciliolate when young, antrorsely scabrous when dry. Foliage-leaves (7) 9–11 (12) per branchlet. Foliage-leaf sheaths mid-green to light green, glabrous; margins eciliate. Foliage-leaf auricles brown lobes with several, about 5–8 mm long, spreading pale bristles. Foliage-leaf ligule very short, inconspicuous, entire. Foliage-leaf blades linear-lanceolate, (9) 12–16 (21) × 1.2–1.6 (2.5) cm, glabrous on both surfaces, dark green above, pale to bluish green beneath; base rounded to wedge-shaped, sometimes slightly asymmetrical; apex attenuate; margins antrorsely scabrous; midrib proximally slightly prominent on both surfaces, mid-green to light green beneath; pseudopetiole 2–3 mm long. Flowers and seeds are unknown.
Comments:
(1) The vegetative characteristics of BS-0107 do not match sufficiently but are closest to those of Bambusa duriuscula.
(2) BS-0107 should also be compared to Bambusa concava from Hainan; however, a description of Bambusa concava has not yet been included in the Flora of China (Bambusa, in Flora of China [#1303], accessed 24 May 2021).
Specimen: BS-0108 [W4] (living plant), Hainan, China, cult., received from M. S. as "Bambusa sp.", 23 June 2013.
Characteristics: Very similar to BS-0107, but culm-internodes on average a bit longer, (40) 55–65 (77) cm, smaller in diameter, 2–3.0 cm, and foliage-leaf auricles with longer bristles, to 1.5 cm long. Flowers and seeds are unknown.