Ceriops decandra are small trees or shrubs with coppice like growth of the inner mangrove zone and grow apparently on better drained soils. It grows as an under-story in the central south western part of the sundarbans and typically is an associate of the species of Xylocarpus, Excoecaria, Heritiera and of Bruguiera. The leaves of C. decandra are rounded, having obovate tendencies and a shiny green upper surface.
The flowers are white in colour, bisexual and cluster on short stalks. It blooms in March to April. The fruit which is about 2.5 cm. long, ripens in May to July, produces a slender, clearly ribbed hypocotyl of about 15 cm. in length. The hypocotyl is broadended at the lower end and tapering upward. The bark is pale yellowish grey to dark brown in colour and contains a great deal of colouring matter. The species possesses stilt roots which develop into broad plank-like buttresses. Groan is a sours of fuellwood with high calorific value, and a source of quality honey as well.
The flowers are white in colour, bisexual and cluster on short stalks. It blooms in March to April. The fruit which is about 2.5 cm. long, ripens in May to July, produces a slender, clearly ribbed hypocotyl of about 15 cm. in length. The hypocotyl is broadended at the lower end and tapering upward. The bark is pale yellowish grey to dark brown in colour and contains a great deal of colouring matter. The species possesses stilt roots which develop into broad plank-like buttresses. Groan is a sours of fuellwood with high calorific value, and a source of quality honey as well.
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