Botanical Survey of India | Flora of India

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Dipterocarpus grandiflorus (Blanco) Blanco, Fl. Filip. ed. 2, 314.1845; Griffith, Not. Pl. Asiat. 4: 515. 1854. Mocanera grandiflora Blanco, Fl. Flip. ed. 1: 451. 1837. Dipterocarpus griffithii Miq., Ann. Mus. Lugd.-bat. 1: 213. 1864; Dyer in Fl. Brit. India 1: 299.1874.

And.: Gurjan; Eng.: Long leaf Gurjan.

Trees, ca 50 m tall; trunk 5 m in girth, hardly buttressed; bark light grey, peeling off in strips; branchlets, leaf bud, outer surface of stipules, parts of petals exposed in bud and top Portion of ovary densely, pale buff pubescent, parts otherwise glabrous. Leaves 12.5 - 24 x 7.5 - 15 cm, elliptic-ovate to broadly ovate, rounded or sometimes subcordate at the insertion of petioles, shortly acuminate at apex; lateral nerves 12 - 20 pairs; petioles ca 8 cm long, slender, shallowly grooved, canescent becoming glabrous at maturity; stipules ca 17.5 x 3.7 cm, oblong-lanceolate, subacute. Racemes axillary, 2 - 4-flowered, usually simple, sometimes branched, occasionally reduced to a single flower; rhachis 7 - 15 cm long, peduncle 2.5 - 3.8 cm long in solitary flowers, glabrous or clothed with yellowish-brown scales. Calyx tube 1.5 - 2.2 cm long, more or less 5-winged, glabrous, 3 longer lobes 4 - 7 cm long, linear-spathulate, obtuse, faintly reticulate, wavy, more or less reflexed, 2 smaller lobes 2.5 - 3.8 cm long, oblong to deltoid. Petals 3.7 - 5 cm long, mealy outside. Stamens 27 - 30, longer than style at anthesis; filaments ca 4 mm long, compressed, connective produced into 5 mm long bristle. Ovary tapering into a short, stout, columnar style, densely tomentose; style ca 1.1 cm long, glabrous in upper half, puberulent in lower half. Fruits ca 6 x 2.5 cm when mature, oblong or ellipsoid, usually with 5 wings; two accrescent calyx lobes (wings) 15 - 22 x 4.5 cm, obtuse, reticulate with 3 parallel nerves, glabrous; three shorter lobes ca 2 x 1.5 cm.

Fl. Jan. - Feb.; Fr. April - June.

Distrib. India: Fairly common in upper hill slopes on rich loamy soils close to sea. Andaman & Nicobar Islands (Andaman Islands).

Myanmar and Malesia (Malaysia, Indonesia and Philippines).

Notes. In Andaman Islands this species grows in association with D. kerri King and D. gracilis Blume as a conspicuous component of the mixed evergreen forest. During November-December the tree sheds its leaves and after a short leafless period, new flushes appear from December to early February. The indumentum on the shoots and the buds, size and shape of the leaves and fruits and length of the enlarged fruiting calyx (wings) have been observed to vary in this species.

Wood widely used as a plywood timber and for temporary construction work, also used as scantlings and plankings and for packing cases. The oleo-resin obtained from the wood is used in varnish industry.

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