Mark P. Simmons

Denhamia silvestris is a shrub or small tree growing from Picton, New South Wales (34° S) to Kroombit Tops, near Gladstone, Queensland (23° S). It occurs in dry rainforest, eucalyptus and rainforest ecotone areas. Common names include narrow leaved orangebark, orange bush and orange bark.

Denhamia fasciculiflora, commonly known as orange bark, is a plant in the family Celastraceae found only in Queensland, Australia.

Denhamia disperma, sometimes referred to as the orange boxwood, is a shrub or small tree growing in eastern Australia, from Queensland to northeastern New South Wales. Often seen in and near dry rainforests.

Denhamia cunninghamii is a species of shrub endemic to Australia. The natural range extends from The Kimberley and throughout The Northern Territory and Queensland. The plant grows to 6 metres in height, though it commonly flowers as a much smaller shrub. It is most commonly found in savanna and open forests, though it occasionally extends into monsoon forest.

Gymnosporia pertinax is a species of flowering plant in the family Celastraceae. It is a scrambling shrub endemic to the island of Rapa Iti in the Tubuai Islands of French Polynesia.

Wilczekra is a genus of flowering plants belonging to the family Celastraceae. Its native range is Western Central Tropical Africa. Species: Wilczekra congolensis (R.Wilczek) M.P.Simmons Wilczekra gabonica Breteler

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Denhamia bilocularis, commonly known as orangebark, is a tree that is endemic to eastern Australia. It grows to 10 metres high and has leaves with toothed edges that are 3 to 9 cm long and 1.3 to 3 cm wide and elliptic, ovate or obovate in shape. The flowers, in short racemes or clusters, appear between September and December in the species' native range. The species was formally described in 1859 by Victorian Government Botanist Ferdinand von Mueller, who gave it the name Celastrus bilocularis. The species was transferred to the genus Maytenus in 1942, and to genus Denhamia in 2011. The

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Haydenoxylon is a genus of flowering plants in family Celastraceae. It includes three species of trees native to the tropical Americas, with one (H. calzadae) native to Veracruz and Costa Rica, and the others (H. gentryi and H. urbanianum) to northwestern South America from Colombia to Bolivia. Haydenoxylon calzadae (Lundell) Biral – Mexico (Veracruz) and Costa Rica Haydenoxylon gentryi (Lundell) M.P.Simmons – Andes of Colombia, Ecuador, and Peru Haydenoxylon urbanianum (Loes.) M.P.Simmons – Colombia, Peru, and Bolivia

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