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Alstonia scholaris, habit (above), details (below)
Amblyocalyx Benth. in G.Bentham & J.D.Hooker
Blaberopus A.DC. in A.P.de Candolle
Winchia A.DC. in A.P.de Candolle
Alstonia is a ...view middle of the document...
The small, more or less fragrant flowers are white, yellow, pink or green and funnel-shaped, growing on a pedicel and subtended by bracts. They consist of 5 petals and 5 sepals, arranged in four whorls. The fertile flowers are hermaphrodite. The gamosepalous green sepals consist of ovate lobes, and are distributed in one whorl. The annular disk is hypogynous. The five gamesepalous petals have oblong or ovate lobes and are disposed in one whorl. The corolla lobes overlapping to the left (such as A. rostrata) or to the right (such as A. macrophylla) in the bud. The ovary has 2 separate follicles with glabrous or ciliate, oblong seeds that develop into deep blue podlike, schizocarp fruit, between 7–40 cm long. The plants contain a milky latex, rich in poisonous alkaloids. The Alstonia macrophylla is commonly known in Sri Lanka as 'Havari nuga' or the 'wig banyan' because of its distinct flower that looks like a woman's long wig.
Alstonia trees are used in traditional medicine. The bark of the Alstonia constricta and the Alstonia scholaris is a source of a remedy against malaria, toothache, rheumatism and snake bites. The latex is used in treating coughs, throat sores and fever.
Many Alstonia species are commercial timbers, called pule or pulai in Indonesia and Malaysia. Trees from the section Alstonia produce light timber, while those from the sections Monuraspermum and Dissuraspermum produce heavy timber.
Alstonia trees are widespread and mostly not endangered. However a few species are very rare, such as A. annamensis, A. beatricis, A. breviloba, A. stenophylla and A. guangxiensis.
Alstonia has five distinct sections, each a monophyletic group; Alstonia, Blaberopus, Tonduzia, Monuraspermum, Dissuraspermum.
Accepted species1.Alstonia actinophylla (A.Cunn.) K.Schum. – Milkwood - New Guinea, N Australia
2.Alstonia angustifolia A.DC. - Borneo, W Malaysia, Sumatra
3.Alstonia angustiloba Miq. - Borneo, W Malaysia, Sumatra, Thailand, Java
4.Alstonia annamensis (Monach.) K.Sidiyasa - Cambodia, Vietnam
5.Alstonia balansae Guillaumin - New Caledonia
6.Alstonia beatricis K.Sidiyasa - Waigeo I in E Indonesia
7.Alstonia boonei De Wild. - W + C + E Africa
8.Alstonia boulindaensis Boiteau - New Caledonia
9.Alstonia breviloba K.Sidiyasa - Papua New Guinea
10.Alstonia congensis Engl. - W + C Africa
11.Alstonia constricta F.Muell. – Bitterbark, Quinine Tree, Australian Fever Bark - E Australia
12.Alstonia coriacea Pancher & S.Moore - New Caledonia
13.Alstonia costata R.Br. - S Pacific
14.Alstonia curtisii King & Gamble - Thailand
15.Alstonia deplanchei Van Heurck & Müll.Arg. - New Caledonia
16.Alstonia guangxiensis D.Fang & X.X.Chen - Guangxi in China
17.Alstonia iwahigensis Elmer - Borneo, Palawan
18.Alstonia lanceolata Van Heurck & Müll.Arg. - New Caledonia
19.Alstonia lanceolifera S.Moore - New Caledonia
20.Alstonia legouixiae Van Heurck & Müll.Arg. - New Caledonia
21.Alstonia lenormandii Van...