Hermann Otto Sleumer

Diogenesia is a genus of flowering plants belonging to the family Ericaceae. Its native range is Western South America to Venezuela. Species:

Pellegrinia is a genus of flowering plants belonging to the family Ericaceae. It is native to Colombia and Peru in western South America. The genus name of Pellegrinia is in honour of François Pellegrin (1881–1965), a French botanist, who specialised in the plants of tropical Africa. It was first described and published in Notizbl. Bot. Gart. Berlin-Dahlem Vol.12 on page 287 in 1935.

Leucothoe fontanesiana, also known as the highland doghobble, fetter-bush, mountain doghobble or switch ivy, is a species of flowering plant in the family Ericaceae, native to the southeastern United States. It is an erect evergreen shrub growing to 1–2 m (3–7 ft) tall by 3 m (10 ft) broad, with laurel-like glossy leaves 6–16 cm (2–6 in) long, and pendent axillary racemes of urn-shaped flowers in spring. This plant is a calcifuge and requires a shaded position in acid soil. The cultivar 'Rollissonii' has gained the Royal Horticultural Society's Award of Garden Merit. L. fontanesiana has been

Guarea guidonia is a species of flowering plant in the family Meliaceae. It ranges from Cuba and Honduras south to Argentina. The bark of Guarea rusbyi (Britton) Rusby, a synonym of Guarea guidonia (L.) Sleumer, is used as an expectorant named cocillana.

Xylosma glaberrima is a species of flowering plant in the family Salicaceae. It is endemic to southeast Brazil, in Paraná (state), Rio de Janeiro (state), and São Paulo (state). It occurs in Restinga and other Atlantic Forest habitats.

Hydnocarpus hainanensis is a species of plant in the Achariaceae family. It is found in China and Vietnam. It is threatened by habitat loss.

Heliciopsis is a genus of about fourteen species of trees, constituting part of the flowering plant family Proteaceae. They grow naturally in Myanmar, Indo-China, China, Thailand, Peninsular Malaysia, Borneo, Sumatra, Java (Indonesia) and the Philippines. The name means similar to the plant genus Helicia. Its closest relatives are Athertonia (Australia) and Virotia (New Caledonia).

Casearia williamsiana is a species of flowering plant in the family Salicaceae. It is endemic to Honduras.

Scolopia steenisiana is a species of plant in the family Salicaceae. It is a tree endemic to Peninsular Malaysia. It is threatened by habitat loss.

Scolopia braunii is an Australian rainforest tree. Common names for this species include flintwood, mountain cherry, brown birch and scolopia. The habitat is Australian coastal rainforests of various types. The natural range of distribution of Scolopia braunii is between Jervis Bay (35° S) in the south to Cape York Peninsula at the northernmost part of Australia.

Hydnocarpus annamensis is a tree in the Achariaceae family. It is found in Thailand, Cambodia, Vietnam, southern Yunnan and southern Guangxi in China. It is threatened by habitat loss. The plant produces low-quality wood and its fruits are used in traditional medicine.

Homalium rubrocostatum is a species of plant in the family Salicaceae. It is endemic to New Caledonia.

Homalium juxtapositum is a species of plant in the family Salicaceae. It is endemic to New Caledonia.

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Ceratostema alatum is a species of Ceratostema found in Ecuador.

Cassinopsis ilicifolia is a spined, straggling shrub or liane in the family Icacinaceae. It is native to the moister regions of southern Africa. It is named ilicifolia due to the leaves with somewhat serrated leaf margins, which resemble those of the genus Ilex.

Agapetes serpens is a species of flowering plant in the heath family Ericaceae, that is native to the Himalayas. Growing to 40–60 cm (16–24 in) tall, this semi-climbing shrub is cultivated as an ornamental for its shiny evergreen leaves and branches of attractive pendulous tubular red flowers, blooming over a long period. It is grown in climates from warm temperate to sub-tropical, but does not survive prolonged freezing (RHS hardiness rating H2). It requires a sheltered position in acid or neutral soil. The Latin specific epithet serpens means "creeping". This plant has received the Royal

Xylosma serpentinum is a species of flowering plant in the family Salicaceae. It is endemic to New Caledonia.

Xylosma ruiziana is a species of flowering plant in the family Salicaceae. It is endemic to Peru.

Xylosma molesta is a species of flowering plant in the family Salicaceae. It is endemic to New Caledonia.

Xylosma maidenii, commonly known as the ship tree or shitum wood is a small tree in the genus Xylosma of the family Salicaceae, endemic to the lowland forests of Australia's Lord Howe Island in the Tasman Sea. The male and female trees are separate, and flower from December to May. The flowers are small and lead to purple/black fruit that comes directly off twigs. When cut, the timber gives off a foul odour.

Xylosma kaalaensis is a species of flowering plant in the family Salicaceae. It is endemic to New Caledonia.

Xylosma inaequinervia is a species of flowering plant in the family Salicaceae. It is endemic to New Caledonia.

Xylosma boulindae is a species of flowering plant in the family Salicaceae. It is endemic to New Caledonia.

Roupala sphenophyllum is a species of plant in the family Proteaceae. It is endemic to Peru.

Neosprucea is a genus of flowering plants in the family Salicaceae. There are ten species native to Panama and northern South America. The genus is distinctive in its poricidal anther dehiscence, large flowers (at least for the family), and usually acrodromous venation similar to that of the Melastomataceae. More than half of the species have been described since 2004.

Xylosma trichostemona (syn. Lasiochlamys trichostemona) is a species of flowering plant in the family Salicaceae, endemic to New Caledonia. Formerly a member of Lasiochlamys, the name was reinstated in 2023 when the genus was transferred to Xylosma. It is listed as a protected species by the National Natural Heritage Inventory and was classified as conservation dependent by the IUCN Red List in 1998.

Xylosma pseudocoriacea (syn. Lasiochlamys pseudocoriacea) is a species of flowering plant in the family Salicaceae, endemic to New Caledonia. Formerly a member of Lasiochlamys, the new name was given in 2023 when the genus was transferred to Xylosma. It is listed as a protected species by the National Natural Heritage Inventory and was classified as vulnerable by the IUCN Red List in 1998.

Xylosma mandjeliana (syn. Lasiochlamys mandjeliana) is a species of flowering plant in the family Salicaceae, endemic to New Caledonia. Formerly a member of Lasiochlamys, the new name was given in 2023 when the genus was transferred to Xylosma. It is listed as a protected species by the National Natural Heritage Inventory and was classified as vulnerable by the IUCN Red List in 1998.

Xylosma hurlimannii (syn. Lasiochlamys hurlimannii) is a species of flowering plant in the family Salicaceae, endemic to New Caledonia. Formerly a member of Lasiochlamys, the name was reinstated in 2023 when the genus was transferred to Xylosma. It is listed as a protected species by the National Natural Heritage Inventory and was classified as endangered by the IUCN Red List in 1998.