George Henry Kendrick Thwaites

Allium hookeri is a plant species native to India, Sri Lanka, Myanmar (Burma), Bhutan, and southwestern China (Sichuan, Tibet and Yunnan). Common names include Hooker chives and garlic chives. Allium hookeri produces thick, fleshy roots and a cluster of thin bulbs. Scapes are up top 60 cm tall. Leaves are flat and narrow, about the same length as the scapes but only 1 cm across. Umbels are crowded with many white or greenish-yellow flowers.

Nechamandra is a monotypic genus of an aquatic plant family Hydrocharitaceae. The sole species is Nechamandra alternifolia. It is found in slow moving fresh water.

Octarrhena, commonly known as grub orchids, is a genus of flowering plants from the orchid family, Orchidaceae. Plants in this genus are small, orchids with short stems, thin roots, short, thick, fleshy leaves arranged in two ranks and tiny flowers. The labellum is rigidly attached to the base of the column. There are about fifty species native to areas from Sri Lanka and Malesia to the Western Pacific.

Filicium is a genus of flowering plants in the soapberry family Sapindaceae, native to east Africa, Madagascar, India and Sri Lanka. The best known species is Filicium decipiens, which is planted as an ornamental tree.

Campnosperma is a genus of rainforest trees in the Cashew Family (Anacardiaceae). They are found in the East Indies, south Asia and the Seychelles.

Vanilla moonii is a species of vanilla orchid that is endemic to Sri Lanka.

Ochlandra is a genus of Indian bamboo in the grass family). The flowers have up to 150 stamens in each flower. The species are endemic to the Western Ghats (India), except for one species from Sri Lanka. Species Formerly included see Cathariostachys Nastus Schizostachyum Valiha Ochlandra capitata - Cathariostachys capitata Ochlandra elegantissima - Nastus elegantissimus Ochlandra perrieri - Valiha perrieri Ochlandra ridleyi - Schizostachyum latifolium

Dipterocarpus zeylanicus, commonly known as හොර - Hora in Sinhalese and සරල - Sarala or කිරිපලු - Kiripalu, is a species of Dipterocarpus that is endemic to Sri Lanka. A closely related Indian species is Dipterocarpus turbinatus. The Sri Lankan tree is a large tree that grows up to 40–45 m (131–148 ft) tall and 4–6 m (13–20 ft) in circumference. The bark is light pinkish brown or light yellowish brown. Leaves are big and oval, 5 to 8 inches (13 to 20 cm) long. The sharp-edged leaves are covered with silver hairs. Flowers bloom in April and seeds have two wings to spread from wind. The bark

Dipterocarpus hispidus is a species of flowering plant in the family Dipterocarpaceae. It is a tree endemic to southwestern Sri Lanka, where it grows in lowland rain forest. The species was first described by George Henry Kendrick Thwaites in 1858.

Bulbophyllum elegans is a species of orchid in the genus Bulbophyllum.

Prismatomeris is a genus of plant in the family Rubiaceae. It includes 17 species native to the Indian subcontinent, Indochina, southern China, and western Malesia. The genus Prismatomeris was described by George Henry Kendrick Thwaites and is currently recognized as a valid genus by major botanical authorities. Its taxonomic status and species circumscription are maintained by Plants of the World Online (POWO), which lists the genus as part of the family Rubiaceae. Prismatomeris albidiflora Thwaites Prismatomeris beccariana (Baill. ex K.Schum.) J.T.Johanss. Prismatomeris borneensis

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Pericopsis is a genus of flowering plants in the legume family, Fabaceae. It includes four species of trees and shrubs, three native to sub-Saharan Africa and one to Sri Lanka, Malesia, New Guinea, and the Caroline Islands. Typical habitats include tropical lowland forest (including riverine or mangrove forests for the Asian species) and seasonally-dry woodland and wooded grassland. Trees of the genus provide excellent timber which is used as a substitute for teak in cabinet work and furniture making.

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Ixora jucunda is a species of flowering plant in the family Rubiaceae. It is endemic to Sri Lanka.

Filicium decipiens, called the ferntree, fern tree or fern leaf tree, is a species of Filicium found in east Africa, Madagascar, India and Sri Lanka. It is planted as an ornamental tree in the Indian subcontinent, Indonesia, Hawaii, and elsewhere.

Cinnamomum citriodorum is a species of flowering plant in the family Lauraceae. It is commonly known as Malabar cinnamon. It is an evergreen tree which grows up to 10 metres tall. The species is endemic to central and southwestern Sri Lanka. It grows in lowland rain forests from 300 to 700 metres elevation. It is a rare tree, known from only five wild populations. It is threatened by habitat loss from conversion of its native forests to agriculture and plantations. It has a characteristic smell of lemon grass. C. citriodorum has 45% cinnamaldehyde compared to 80% for C. cassia.

Blyxa octandra is an aquatic plant in the genus Blyxa.

Axinandra is a genus of plant in family Crypteroniaceae. It contains the following species: Axinandra alata Baill. Axinandra beccariana Baill. Axinandra coriacea Baill. Axinandra zeylanica Thwaites

Areca concinna is a species of flowering plant in the family Arecaceae. It is palm shrub or tree found only in Sri Lanka. It is threatened by habitat loss.

Aeluropus lagopoides, sometimes called mangrove grass or rabbit-foot aeluropus, is a species of Eurasian and African plant in the grass family, found primarily in salty soils and waste places.

Stemonoporus affinis is a species of plant in the family Dipterocarpaceae. It is a tree endemic to Sri Lanka, where it is known only from the Knuckles Range. It is a small, gregarious lower canopy tree growing in remaining patches of submontane wet evergreen forest. The species was first described by George Henry Kendrick Thwaites in 1854.

Stemonoporus is a genus of plants in the family Dipterocarpaceae. The genus is endemic to Sri Lanka. It contains 26 species, all but one confined to the perhumid forests of the island.

Psychotria sordida is a species of plant in the family Rubiaceae. It is endemic to Sri Lanka.

Pericopsis mooniana, the nandu wood or nedun tree, is a species of legume in the family Fabaceae. It is found in Indonesia, Malaysia, Micronesia, Palau, Papua New Guinea, the Philippines, and Sri Lanka. It is threatened by habitat loss.

Ixora calycina is a species of flowering plant in the family Rubiaceae. It is endemic to Sri Lanka.

Calophyllum bracteatum is a species of flowering plant in the Calophyllaceae family. It is a tree found only in south-central and southwestern Sri Lanka, where it is known as වලු කින (walu kina) by local people.

Vatica affinis is a species of flowering plant in the family Dipterocarpaceae. It is a tree endemic to southwestern Sri Lanka. It is an endangered species threatened by habitat loss.

Trichadenia is a genus of flowering plants in the family Achariaceae. It includes three species native to Sri Lanka, the Philippines, Sulawesi, Maluku Islands, and Papuasia (New Guinea, the Bismarck Archipelago, and Solomon Islands). Trichadenia philippinensis Merr. – Philippines, Sulawesi, Maluku, and Papuasia Trichadenia sasae W.N.Takeuchi – eastern New Guinea Trichadenia zeylanica Thwaites – Sri Lanka

Syzygium gardneri is a species of plant in the family Myrtaceae.