Cornelis Gijsbert Gerrit Jan van Steenis

Anredera cordifolia, commonly known as the Madeira vine or mignonette vine, is a South American species of ornamental succulent vine of the family Basellaceae. The combination of fleshy leaves and thick aerial tubers makes this a very heavy vine. It smothers trees and other vegetation it grows on and can easily break branches and bring down entire trees on its own. Other names include lamb's tail and potato vine.

Friesodielsia is a genus of flowering plants in the custard apple and soursop family Annonaceae, with all species found in the Old World, mostly in the tropics. A molecular study shows that Friesodielsia should be more narrowly circumscribed, with the only species remaining being the Asian ones, which can also be distinguished by their possession of globose or ellipsoid monocarps, and six petals per flower arranged in two whorls.

Petrosavia sakuraii, one of three species in the genus Petrosavia, is a monocotyledonous plant first described by Tomitaro Makino in 1903 (see illustration), distributed in eastern and south-eastern Asia. They are rare leafless achlorophyllous, mycoheterotrophic plants found in dark montane rainforests.

Nothofagus nuda is a species of plant in the family Nothofagaceae. It is a tree endemic to Gulf Province of Papua New Guinea in eastern New Guinea. It is threatened by habitat loss. The species was described by Cornelis Gijsbert Gerrit Jan van Steenis in 1972. N. nuda proposed to be renamed Trisyngyne nuda in 2013.

Mazus pumilus, commonly called Japanese mazus, is a species of flowering plant in the Mazaceae family. It is native to south and east Asia, where it is found in Bhutan, China, India, Pakistan, Bangladesh, Indonesia, Japan, Korea, Nepal, New Guinea, the Philippines, Russia, Taiwan, Thailand, and Vietnam. It is an invasive species in North America. Its natural habitat is wet grasslands, streambanks, and trailsides. It is tolerant of disturbance, and can be found in areas such as cultivated fields, sidewalk cracks, and waste ground. It is a very common species in Japan. It is an upright annual

Pentastemona is a genus in the family Stemonaceae, described as a genus in 1982. In 1992, Duyfjes placed the genus in its own family, the Pentastemonaceae, but this is not widely accepted. It is the only monocot genus with pentamerous flower parts (i.e. five petals, five sepals, five stamens and five carpels). The entire genus is endemic to the island of Sumatra in Indonesia.

Dyera polyphylla is a tree species in the family Apocynaceae native to Sumatra and Borneo. It grows to 60 m tall in freshwater swamp forest, peat swamp forest, and kerangas on groundwater podzols.

Sympetalandra schmutzii is a species of legume in the family Fabaceae. It is found only on Flores in Indonesia.

Pauldopia is a monotypic genus of flowering plants belonging to the family Bignoniaceae. It only contains one known species, Pauldopia ghonta (Buch.-Ham. ex G.Don) Steenis Its native range is India to Indo-China. It is found in China, India, Laos, Sri Lanka, Thailand and Vietnam. The genus name of Pauldopia is in honour of Paul Louis Amans Dop (1876–1954), a French botanist who worked extensively in Indo-china. The Latin specific epithet of ghonta is a Bengalis word which means bell, alluding to the corolla shape of the flower. See also Ghanta. Both the genus and the species were first

Nothofagus womersleyi is a species of plant in the family Nothofagaceae. It is endemic to Kebar Valley on the Vogelkop Peninsula in West Papua (Indonesia). It is a Critically Endangered species threatened by habitat loss. It was proposed to be renamed Trisyngyne womersleyi in 2013.

Nothofagus grandis is a species of tree in the family Nothofagaceae. It is endemic to New Guinea. It grows in lower montane rain forests from 900 to 1,500 meters elevation.

Nothofagus aequilateralis is a species of tree in the family Nothofagaceae. It is endemic to New Caledonia. It grows in the southern end of the island from 160 to 1,150 meters elevation, often on ridge tops.

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Ruthiella is a genus of flowering plants in the bellflower family Campanulaceae. It contains four species, all endemic to New Guinea.

Pandorea pandorana, commonly known as the wonga wonga vine or wonga-vine, is a species of flowering plant in the family Bignoniaceae and is native to Australia, Malesia and the southwestern Pacific region. It is a woody scrambler or climber with pinnate leaves, juvenile leaves differing from those of mature plants. The flowers are tubular or funnel-shaped and white with purple markings and the fruit are capsules containing winged seeds. It is easy species to germinate and is a popular garden plant. Common cultivars include the yellow-flowered P. 'Golden Showers', the white-flowered P.

Nothofagus stylosa is a species of plant in the family Nothofagaceae. It is endemic to West Papua (Indonesia). It is a Critically Endangered species threatened by habitat loss. Nothofagus stylosa is known from a single population on the northern slope of the Central Range of Western New Guinea at approximately 1,200 meters elevation. It has an estimated area of occupancy (AOO) of 4 km2. It grows in lower montane forest among other, more widespread, species of Nothofagus, including Nothofagus carrii and Nothofagus flaviramea. Nothofagus forests in the area are exploited for timber, and the

Nothofagus resinosa is a species of tree in the family Nothofagaceae. It is endemic to New Guinea. It grows in montane rain forests at around 1,560 meters elevation.

Nothofagus pullei is a species of tree in the family Nothofagaceae. It is endemic to New Guinea. It grows in montane rain forests from 2,350 to 3,200 meters elevation.

Nothofagus pseudoresinosa is a species of tree in the family Nothofagaceae. It is endemic to Papua New Guinea. It grows in montane rain forests from 2,500 to 2,750 meters elevation in central and southeastern Papua New Guinea.

Nothofagus perryi is a species of tree in the family Nothofagaceae. It is endemic to Papua New Guinea. It grows in montane rain forests from 1,500 to 2,500 metres (4,900 to 8,200 ft) elevation in central and southeastern Papua New Guinea. This plant was first described in 1952 by Cornelis Gijsbert Gerrit Jan van Steenis.

Nothofagus flaviramea is a species of tree in the family Nothofagaceae. It is endemic to New Guinea.

Nothofagus discoidea is a species of plant in the family Nothofagaceae. It is endemic to New Caledonia.

Nothofagus crenata is a species of tree in the family Nothofagaceae. It is endemic to New Guinea. It grows in lowland rain forest below 900 meters elevation. There are two accepted varieties: Nothofagus crenata var. crenata Nothofagus crenata var. sapeii Steenis

Nothofagus codonandra is a species of tree in the family Nothofagaceae. It is endemic to New Caledonia. It grows in the southern and central portions of the island above 150 meters elevation.

Nothofagus carrii is a species of tree in the family Nothofagaceae. It is endemic to New Guinea. It is a canopy tree, reaching 20 to 45 meters in height with a trunk diameter of 25 to 130 cm. The base is often buttressed. Trees growing on exposed ridges are typically much smaller in size. It ranges from the Arfak Mountains of western New Guinea's Vogelkop Peninsula along the Central Range to the Huon Peninsula and Papuan Peninsula of Papua New Guinea, and on the D'Entrecasteaux Islands. Nothofagus carrii grows in lowland and montane forests from below 900 meters elevation up to 2,200 meters

Nothofagus brassii is a species of tree in the family Nothofagaceae. It is endemic to New Guinea. It is commonly known in Indonesia as Sagé, sagé hitam (Dani, Wamena, Highland Papua), sahé (Yali, Highland Papua), and Digi (Mee, Central Papua).

Nothofagus baumanniae is a species of tree in the family Nothofagaceae. It is endemic to New Caledonia, where it grows in forests at high elevations. The species is threatened by fires, nickel mining and climate change.

Nothofagus balansae is a species of tree in the family Nothofagaceae. It is endemic to New Caledonia. It grows in the southern and central portions of the island from 200 to 1,350 meters elevation.

Lamiodendron is a monotypic genus of flowering plants belonging to the family Bignoniaceae. It only consists of one species, 'Lamiodendron magnificum' 'Steenis It is also in the Tribe Tecomeae. It is native to New Guinea. The genus name of Lamiodendron is in honour of Herman Johannes Lam (1892–1977), a Dutch botanist. The Latin specific epithet of magnificum is derived from magnificus meaning magnificent. Both genus and species were first described and published in Nova Guinea, Bot., Vol.8 on pages 379-381 in 1957.