WorldFloraDB - Duabanga grandiflora

Characteristics

Tree, 18-30 m, scarcely buttressed, glabrous in all its parts; branches drooping, young branchlets obtusely quadrangular. Leaves ovate-oblong from a broad, cordate or rounded base, shortly acumin-ate, on both sides of the (on the lower surface) much prominent costa with numerous widely patent arcuate lateral nerves, glaucous beneath, 10-30 by 5-10 cm; petiole robust, 3-8 mm; flush reddish pink. Corymbs drooping, rather many-flowered, ± 15 cm across, rather lax. Pedicels robust, 3-4 cm. Calyx-tube widely cup-shaped, segments ovate, acute, 2¼-2½ cm. Petals shortly clawed, with an oval, rounded crisped blade, white, 2½-3½ by 1½-2½ cm. Stamens upwards of 50; filaments filiform from a slightly broadened base, white; anthers very mobile, curved but not narrowly hairpin-shaped. Free top of ovary broadly conical; stigma slightly lobed, darkgreen. Capsule subglobose, green, eventually turning brown and splitting with 5-7 longitudinal clefts.

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Trees, medium to tall, 30[-40] m tall, glabrous. Leaves rigid, distichous; petiole to 1.2 cm; leaf blade abaxially pale green, adaxially dark green, ovate to oblong, broad, 12-15 × 5-7 cm, abaxially glaucous, lateral veins [12-]20-24 pairs, base cordate, apex shortly acuminate. Corymbs 3-20-flowered, drooping at ends of branches; pedicels 3-4 cm, stout. Floral tube broadly campanulate, 1.6-2.5 × 1.8-3 cm; sepals (5 or)6, green, thick, enlarged in fruit. Petals 6, white, obovate, 2.5-3 × 1.5-2 cm. Stamens numerous, ca. 50 or more, white, surpassing petals. Capsules subglobose, 3-4 × [3-]4-4.5 cm, 6-9-valved. Seeds 4-6 mm. Fl. spring. 2n = 48.

A tall evergreen tree. It grows to about 35 m high. It can be 60 m high. The trunk is smooth and greyish brown. It has hoop shaped ridges and leaf scars that are shaped like shields. The bark peels off in flakes. The leaves are 9-33 cm long by 4-11 cm wide. They are broadly sword shaped with a heart shaped base and a rounded tip. The flowers are white. They are held in large heads. The flowers come out at night. They have an unpleasant smell. The fruit is a capsule 3 cm across. It splits into 6 parts. There a 6 star shaped calyxes around the fruit. There are a large number of thread like seeds.

Life form	perennial
Growth form	tree
Growth support	free-standing
Foliage retention	evergreen
Sexuality	hermaphrodite
Pollination	-
Spread	-
Mature width (meter)	-
Mature height (meter)	24.0 - 32.5
Root system	-
Rooting depth (meter)	-
Root diameter (meter)	-
Flower color
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Nitrogen fixer	-
Photosynthetic pathway	c3

Environment

RIDLEY ( RIDLEY Disp. 1930 p. 119 ) says:'It is an inhabitant of forests in the Malay Peninsula, where it is widely scattered, but not common. The trees are sporadic, at some considerable distance from each other. It appears to prefer loose open soil, which is not to be found in a large quantity in dense tropical forests; but the very numerous, minute seeds blown across the jungle may here and there find a suitable spot for growth, and so carry on the spread of the plant, though in these forests far the greater number of seeds must perish for want of a suitable growing spot.' According to CORNER Wayside Trees 1940 427 atl. f. 127-128 one of the characteristic trees of all the passes of the Main Range in the Mal. Peninsula from G. Angsi to Kroh.

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Valley forests, open places, especially on river banks; at elevations of 900-1,500 metres. Often found in disturbed moist areas, at elevations up to 1,200 metres, more frequent in hilly areas on the moist valley slopes.

A tropical plant. It grows to about 1000 m altitude in Nepal. They grow along stream banks in warm moist climates. It can grow in areas that are occasionally flooded. It grows in hardiness zones 10-12. In Yunnan.

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Hardiness (USDA)

Usage

Uses. Wood used for tea-boxes and for house-and boat-building. Malays eat the very acid fruits ( BURK. Dict. 1 1935 869 ).

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The fruit are eaten fresh. They have a sour taste. They are used for drinks. The young fruit are boiled and eaten.

Uses	construction dye fiber food material medicinal tea timber wood
Edible	fruits nectars
Therapeutic use	Antifungal agents (bark), Antineoplastic agents (bark), Spasm (bark), Antifungal agents (flower), Antifungal agents (leaf), Antifungal agents (root), Hemagglutination (seed)
Human toxicity	-
Animal toxicity	-

Cultivation

Plants are grown from seed. They can also be grown from large cuttings.

Mode	seedlings
Germination duration (days)	-
Germination temperacture (C°)	-
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