Indosasa ingens
Indosasa ingens Hsueh & T. P. Yi, Acta Bot. Yunnan. 5 (1), 1983: 39.
Thai name: No known records.
Chinese name: 粗穗大节竹 (cū suì dà jié zhú).
Distribution: THAILAND: There are no known records that this species was successfully introduced into cultivation in Thailand. — CHINA (South): southeastern Yunnan, along streams, at 900–1,600 m altitude.
Descriptions:
(1) "Habit: Perennial. Rhizomes elongated; leptomorph. Culms erect; 200-600 cm long; 30-50 mm diam.; woody; 15 -noded. Culm-internodes terete; thin-walled; 30-40 cm long. Lateral branches dendroid. Bud complement 1. Branch complement three. Culm-sheaths deciduous; 12-24 cm long; 1.5 times as long as wide; coriaceous; hispid; with tawny hairs; without auricles; glabrous on shoulders. Culm-sheath ligule 1-1.5 mm high. Culm-sheath blade ovate; narrower than sheath; reflexed; 2-5 cm long; 8-20 mm wide; glabrous on surface. Leaves 4-10 per branch. Leaf-sheaths 5-12 cm long; outer margin hairy. Leaf-sheath oral hairs scanty. Leaf-sheath auricles absent. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blade base cuneate; with a brief petiole-like connection to sheath. Leaf-blades lanceolate, or oblong; 12-24 cm long; 25-45 mm wide. Leaf-blade venation with 12-14 secondary veins; with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade margins scaberulous. Leaf-blade apex acuminate. … [flowers and seeds described]." — KewScience POWO, accessed 10 July 2020 [#1305].
(2) "Culms to 6 m, 3–5 cm in diam.; internodes initially dark green or purple-green, yellow-brown in age, 30–40(–60) cm, glaucous, setose, scabrid. Culm sheaths yellow-brown, sparsely setose; auricles and oral setae absent; ligule arcuate or weakly prominent, shortly ciliate; blade reflexed or erect, triangular-ovate. Leaves 5–9 per ultimate branch; sheath glabrous; auricles absent; oral setae 2 or 3, deciduous; blade oblong to lanceolate, 14–27 × 2.5–4.5 cm, glabrous, secondary veins 6–8-paired. … [flowers described]." — Flora of China, accessed 10 July 2020 [#1303].
Images: Line drawing in Flora of China [#1303]. Photos (habit, young shoot) in H. C. Tan, 2012: 65 [#1195].
Comments:
(1) Seeds offered by FMXG, Yunnan, China, as "Indosasa ingens, 粗穗大节竹 (cū suì dà jié zhú)", due for collection in July/Aug. 2012, but were not received.
(2) Seed weight: 10 g ≈ 240–260 dried spikelets (husk-wrapped seeds). Seed viability: Unknown, viability is assumed to last at least several months. — acc. FMXG.
Indosasa ingens: Node with branches (left), culms (right) — by courtesy of Lihua Jiang, Yunnan Bamboo, China