Gigantochloa wrayi

Gigantochloa wrayi Gamble
  • Synonyms: Gigantochloa maxima var. viridis Holttum.
  • Thai name: Not recorded. Malay name: Buluh beti.
  • Distribution: THAILAND (South); MALAYSIA (North), in lowlands, also cultivated in villages; MYANMAR.
  • Culm size: 10 m height, 2 - 7 cm diameter.
  • Descriptions:
    (1) "Culms medium sized, up to 7 cm. thick, not hairy; culm-sheaths up to 27 cm., dark-hairy when young, blade reflexed, green when young, narrow and narrowed to the base, dark-hairy on the upper surface; auricles firm, low, entire, with a few bristles near the outer ends; ligule lacerated with the lacerations prolonged into bristles, up to 1 cm. high; leaf-blades up to 40 x 6 cm., lower surface fine-hairy; stalk 8 mm. long; auricles small, often bristly; ligule short. ..." — H. B. Gilliland, Revised Flora of Malaya, vol. 3, 1971: p. 33 [#1039].
    (2) "Culm sheaths green, occasionally streaked with paler green, covered with dark brown hairs; blade broadly lanceolate, spreading to reflexed; auricles low rims 0.5–1.5 mm high, glabrous to frequently with scattered fine bristles near the ends; ligule 6–11 mm long, deeply divided to form bristle-like lacerations 3–7 mm long. Culms to 6–12(–15) m tall, commonly 2–8(–12) cm diameter; internodes 25–40 cm long, dark green, occasionally streaked with paler yellowish green at the basal part of the culm, without white wax, with scattered dark hairs near the top of the internode. Leaf: blades 9–40 cm long, 1.2–6 cm wide, pale short-hairy below; stalk 2.5–4 mm long; auricles small lobes hardly 0.5 mm high, glabrous to fine-bristly; ligule a subentrie rim 0.5–1.5 mm long, not bristly ... [flowers described]." — K. M. Wong, Bamboos of Peninsular Malaysia, 1995: p. 142-143, fig. 80 [#1210].
    (3) "Densely tufted, sympodial bamboo. Culm erect, slightly arching outwards, up to 12 m tall, diameter 2–20 cm, plain green or sometimes streaked yellow at the base; internodes non-waxy, up to 40 cm long, with scattered appessed dark-brown hairs on the upper parts; nodes not conspicuously swollen. Branches at each midculm node arising from a single bud, consisting of a dominant primary branch, 1–2 subdominant branches from its base and several lesser branchlets of higher orders. Culm sheath pale green, sometimes with faint yellow stripes, covered with dark brown hairs; blade broadly triangular on lower sheaths, broadly lanceolate on midculm and upper sheaths, green or sometimes flushed purple, spreading to reflexed, hirsute at base and along midrib on lower half; ligule lacerate, the base 1–2 mm tall, the lacerations to 8 mm long, bristly along rim when young; auricles low and rimlike, 2–4 mm long, sometimes raised at the outer ends, glabrous except for a few scattered pale bristles 2–5 mm long near the outer ends, dark green to dark purple. Leaf blade 9–40 cm × 1.5–6 cm, lower surface covered with soft pale hairs; ligule subentire, not bristly, 1–2 mm long; auricles small rounded lobes 1–2 mm long. Pseudospikelet 10–20 mm long, with 2–3 gemmiferous bracts, 3–4 glumes, 3–4 perfect florets and a vestigial terminal floret respresented by an empty lemma 8–17 mm long. Caryopsis cylindrical-ellipsoidal, about 10 mm long, grooved on one side, apex thickened and hairy." — K. M. Wong in S. Dransfield & E. A. Widjaja (editors), Plant Resources of South-East Asia No. 7, Bamboos, 1995: p. 124-126, fig.
    (4) J. S. Gamble, Bambuseae Brit. India, 1896, p. 64.
    (5) Kew GrassBase.
  • Images: Line drawing in J. S. Gamble, Bambuseae Brit. India, 1896, pl. 55.
  • Uses: Culms for basketry.
  • Comments: Closely related to G. scortechinii, which has farinose internodes, whereas G. wrayi is not farinose.

Gigantochloa wrayi 'Impian'
  • Thai names: Not recorded.
  • Distribution: MALAYSIA, in cultivation.
  •  
  • Specimens: BS-0303 (living plants), received from Rimba Ilmu Botanical Garden, Malaysia, as "Gigantochloa wrayi", by C. S. in Sep. 2009.
  • Characters: Culm internodes striped in whitish green and cream.
  • Uses: Plants as garden ornamentals.
  • Flowering and seeding: The plant, a single clump, started gregarious flowering in January/February 2017. Seed-containing spikelets were found in late March 2017. In more than 10% of spikelets, perhaps even more than 20%, a seed has developed. Spikelets drop off early. Little over 100 seed-containing spikelets were harvested 29–30 March, of which 100 were sown on 31 March 2017. Record on seed germination in Compilation of Bamboo Seeds: BS-0303A. Three strong seedlings were selected, BS-0303B, BS-0303C, and BS-0303D, for further observation and cultivation.
  • Comments: The characters of culm-leaves of BS-0303 do not match closely with those as described by K. M. Wong. Further investigation is needed to proof the identity.

BS-0303_81_1675x800.jpg

Gigantochloa wrayi 'Impian' (BS-0303):
Young shoot with culm-leaf, showing a patent culm-leaf blade, and a tall brownish lacerated ligule which extends into whitish bristly fringes (left);
internode on lower culm (center); habit of the plant, which is in an early stage of flowering, 1st March 2017 (right)


BS-0303_82_3500x800.jpg

Gigantochloa wrayi 'Impian' (BS-0303): Flowering branch (left); spikelets containing seed (BS-0303A, center); seedlings, 23rd day after sowing (BS-0303A, right)