Cratoxylum glaucum (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Cratoxylum glaucum Korth.

Protologue: Temminck, Verh. Natuurl. Gesch. Ned. Overz. Bez., Botanie, Kruidk.: 176 (1842).

• Cratoxylum microphyllum Miq. (1861),
• Cratoxylum polystachyum Turcz. (1863),
• Cratoxylum procerum Diels (1926).

• Brunei: serongan
• Indonesia: edat (Bangka, West Kalimantan), kayu longgang (West Kalimantan), geronggang (East Kalimantan)
• Malaysia: geronggang puteh (Sarawak).

Southern Peninsular Malaysia, the eastern Sumatran islands and Borneo.

The timber is used as geronggang.

• A shrub or small tree of up to 25 m tall, bole up to 50 cm in diameter.
• Leaves elliptical, 2-10 cm × 1-5 cm, with an acute or obtuse or sometimes rounded apex having a black mucro, densely greyish to orange-yellow papillose glaucous beneath.
• Inflorescence a terminal, few- to many-flowered, cylindrical panicle; flowers homostylous, petals deep red to crimson, with a small, shallowly denticulate nectary scale at the base.
• Seeds (4-)6-8 per locule, winged all around.

C. glaucum occurs generally on acid soils, in freshwater or peat-swamp forest, in heath forest on podzolized soils. It occurs scattered but locally dominant and sometimes in almost pure stands, from sea-level up to 200(-1000) m altitude.

24, 89, 276, 354, 748, 779.

• Cratoxylum

• M.S.M. Sosef (selection of species)