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Cratoxylum glaucum Korth.

Family Name: Hypericaceae
Full Sun Semi Shade Native to Singapore Suitable for Roadsides Ornamental Flowers Shrub Tree


Family Name
Genus Epithet
Species Epithet
Name Authority
Name Status (botanical)

Classifications and Characteristics

Plant Division Angiosperms (Flowering Seed Plants) (Dicotyledon)
Plant Growth Form Tree (Small (6m-15m)), Shrub
Lifespan (in Singapore) Perennial
Mode of Nutrition Autotrophic
Plant Shape Irregular
Maximum Height 10 m


Native Distribution Sumatra, Peninsular Malaysia, Singapore, Natuna Island, Pulau Karimata, and Borneo
Native Habitat Terrestrial (Primary Rainforest, Secondary Rainforest, Freshwater Swamp Forest)
Preferred Climate Zone Tropical
Local Conservation Status Native to Singapore (Common)

Description and Ethnobotany

Growth Form It is a shrub or tree up to 10 m tall, with a reddish-brown, flaky bark.
Foliage Its opposite, stalked leaves have leathery leaf blades that are oval, and 2–10 by 1–5 cm, with a waxy layer on its undersides.
Flowers Its flowers have crimson petals and curved boat-shaped sepals.  They are usually found in branched, flowering clusters.
Fruits Its fruits are capsules, 7–10 by 3–4 mm, and covered for half of its length by the sepals. Its winged seeds are found in a group of 4–8 per locule.
Habitat It grows in lowland primary and secondary kerangas forest on white sand, in peat swamps, and freshwater swamp forests.
Associated Fauna Its flowers are insect-pollinated.
Cultivation It can be propagated by seed.
Etymology Greek kratos, strength; Greek xulon, wood, referring to the strong timber. Latin glaucum, with a bloom, referring to the waxy layer on the leaf surface

Landscaping Features

Landscaping It may be suitable for parks and streetscapes.
Desirable Plant Features Ornamental Flowers
Plant & Rootzone Preference - Tolerance Moist Soils, Well-Drained Soils, Fertile Loamy Soils
Landscape Uses General, Roadside Tree / Palm, Parks & Gardens, Small Gardens

Fauna, Pollination and Dispersal

Pollination Method(s) Biotic (Fauna)
Seed or Spore Dispersal Abiotic

Plant Care and Propagation

Light Preference Full Sun, Semi-Shade
Plant Growth Rate Moderate


Foliage Retention Evergreen
Mature Foliage Colour(s) Green
Mature Foliage Texture(s) Leathery
Foliar Type Simple / Unifoliate
Foliar Arrangement Along Stem Opposite
Foliar Attachment to Stem Petiolate
Foliar Shape(s) Non-Palm Foliage (Oval)
Foliar Venation Pinnate / Net
Foliar Margin Entire

Floral (Angiosperm)

Flower & Plant Sexuality 1 Bisexual Flowers
Flower Colour(s) Red
Flower Grouping Cluster / Inflorescence
Flower Location Axillary
Flower Symmetry Radial

Fruit, Seed and Spore

Mature Fruit Colour(s) - Angiosperms and Gymnosperms Brown
Fruit Classification Simple Fruit
Fruit Type 1 Dehiscent Dry Fruit
Fruit Type 2 Capsule

Image Repository



Master ID 29077
Species ID 3391
Flora Disclaimer The information in this website has been compiled from reliable sources, such as reference works on medicinal plants. It is not a substitute for medical advice or treatment and NParks does not purport to provide any medical advice. Readers should always consult his/her physician before using or consuming a plant for medicinal purposes.
Species record last updated on: 22 February 2022.