Engkik Soepadmo

Quercus sumatrana is an oak native to the islands of Sumatra and Borneo in Indonesia and Malaysia. On Borneo, it is reported from Sarawak, Sabah and East Kalimantan. This is a very large emergent tree up to 60 m (200 ft) tall, growing in mixed dipterocarp forest up to 1,400 m (4,600 ft) elevation. It is placed in subgenus Cerris, section Cyclobalanopsis.

Lithocarpus elegans is a tree in the beech family Fagaceae. The specific epithet elegans means 'elegant', referring to the acorns and cupules.

Quercus gaharuensis is a species of oak native to Borneo, Sumatra, and Peninsular Malaysia. It is placed in Quercus subgenus Cerris, section Cyclobalanopsis.

Quercus valdinervosa is a species of oak endemic to Borneo. It is placed in Quercus subgenus Cerris, section Cyclobalanopsis.

Quercus steenisii is a species of oak. It is a tree native to northern Sumatra. Quercus steenisii is native to montane rain forests from 2,000 to 3,350 metres elevation. It is known from only two or three sites. The species' estimated extent of occurrence (EOO) is 1,123 km2, and its area of occupancy (AOO) is 12 km2. Its population is not well understood, and is presumed to be declining. It is threatened with habitat loss from land conversion and logging in its native range.

Quercus pseudoverticillata is a rare species of oak in the family Fagaceae. It is endemic to Mount Kinabalu on Borneo. Quercus pseudoverticillata is known from a single location on Mount Kinabalu, in Malaysia's Sabah state in northeastern Borneo. It lives in montane rain forest between 1,280 and 1,650 metres elevation. The species' conservation status is assessed as Critically endangered. It is rare within its small range, and may be extinct.

Quercus percoriacea is a species of oak endemic to Borneo, where it is known only from northern Sarawak state of Malaysia. It is placed in Quercus subgenus Cerris, section Cyclobalanopsis.

Quercus kinabaluensis is a species of oak endemic to the mountains of Borneo. It is placed in Quercus subgenus Cerris, section Cyclobalanopsis.

Quercus kerangasensis is a species of oak native to Borneo. It is placed in Quercus subgenus Cerris, section Cyclobalanopsis.

Lithocarpus perakensis, synonyms including Lithocarpus kingii, is a species of plant in the family Fagaceae. It is a medium-sized tree endemic to Peninsular Malaysia. It grows on exposed sites in evergreen rain forests from 90 to 1,200 metres elevation. It is threatened by habitat loss.

Lithocarpus leptogyne is a tree in the beech family Fagaceae. The specific epithet leptogyne is from the Greek, referring to the slender female flower.

Lithocarpus kostermansii is a species of plant in the family Fagaceae. It is a tree endemic to western Java in Indonesia. It is an endangered species threatened by habitat loss.

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Lithocarpus gracilis is a tree in the beech family Fagaceae. The specific epithet gracilis means 'slender', referring to the twigs.

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Lithocarpus ruminatus, the ruminate stone oak, is a species of stone oak, native to the island of Borneo.

Lithocarpus revolutus is a tree in the beech family Fagaceae. It is native to Borneo and Peninsular Thailand. The species was first formally described by Engkik Soepadmo in 1970. The name is derived from the way in which the margins of the leaves are typically rolled in upon themselves (revolute). Trees in genus Lithocarpus are commonly known as the stone oaks and differ from Quercus primarily because they produce insect-pollinated flowers.

Lithocarpus muluensis is a tree in the beech family Fagaceae. It is named for Gunung Mulu mountain in Sarawak, Borneo.

Lithocarpus melataiensis is a tree in the beech family Fagaceae. It is named for, and native to, Bukit Melatai mountain in Sarawak, Borneo.

Lithocarpus meijeri is a tree in the beech family Fagaceae. It is native to Borneo. The species was first described by Engkik Soepadmo in 1970. It is named for the Dutch botanist Willem Meijer.

Lithocarpus mariae is a tree in the beech family Fagaceae. It is endemic to Borneo.

Lithocarpus luteus is a tree in the beech family Fagaceae. It is endemic to Borneo. The species was first described by Engkik Soepadmo in 1970. The specific epithet luteus means 'golden yellow', referring to the acorn's indumentum.

Lithocarpus kochummenii is a tree in the beech family Fagaceae. It is named for the botanist K. M. Kochummen.

Lithocarpus keningauensis is a tree in the beech family Fagaceae. It is named for Keningau District in Sabah, to which the species is native.

Lithocarpus kalkmanii is a tree in the beech family Fagaceae. It is endemic to Borneo. The species was first described by Sang Julia and Engkik Soepadmo in 1998. It is named for the Dutch botanist Cornelis Kalkman.

Lithocarpus jacobsii is a tree in the beech family Fagaceae. It is endemic to Borneo. The species was first described by Engkik Soepadmo in 1970. It is named for the Dutch botanist Marius Jacobs. Trees in Lithocarpus are commonly known as the stone oaks and differ from Quercus primarily because they produce insect-pollinated flowers.

Lithocarpus hatusimae is a tree in the family Fagaceae. It is endemic to western Borneo.

Lithocarpus ferrugineus is a tree in the beech family Fagaceae. The specific epithet ferrugineus means 'red-brown', referring to the acorn's indumentum.

Lithocarpus echinulatus is a tree in the beech family Fagaceae. The specific epithet echinulatus means 'having short spines', referring to the cupule.

Lithocarpus corneri is a tree in the beech family Fagaceae. It is named for the English botanist E. J. H. Corner.