Alstonia

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Alstonia

Description

Shrubs or trees. Leaves in whorls (in Malesia); Inflorescence compound, cymose, terminal, pedunculate, frequently in whorls or umbellate, few- to many-flowered. Flowers 5-merous, actinomorphic, mostly fragrant. Sepals without colleters in the axils. Stamens free from the pistil; Fruit a pair of follicles (a single 2-celled follicle only in A. rostrata). Seeds numerous, elliptic, narrowly elliptic or oblong, ends rounded to acuminate, or caudate, glabrous or pubescent, long cilia forming a coma of simple hairs.

Distribution

Asia-Tropical, from the Himalayas and China to New South Wales, Australia present, from tropical Africa to Central America present
The genus has 43 species, ranging from tropical Africa to Central America, and from the Himalayas and China to New South Wales, Australia. However, it is likely that the Central American species should be removed from Alstonia, and the genus Tonduzia resurrected, as molecular work shows them not to be at all closely related (Endress, pers. comm.). In Malesia 16 species in two sections, sect. Alstonia and sect. Monuraspermum.

Citation

R.Br. - in Mem. Wern. Nat. Hist. Soc. 1811: 75
Monach. - in Pacific Sci. 1949: 137
Benth. & Hook.f. - in Gen. Pl. 1876: 705
Backer & Bakh.f. - in Fl. Java. 1965: 226
Benth. & Hook.f. - in Gen. Pl. 1876: 695
H. Huber - in Abeyw. (ed.), Revis. Handb. Fl. Ceylon 4. 1983: 40
Pit. - in Lecomte, Fl. Indo-Chine 3. 1933: 1161
Pichon - in Bull. Mus. Hist. Nat. (Paris). 1947: 294
H. Huber - in Abeyw. (ed.), Revis. Handb. Fl. Ceylon 1. 1973: 11
Pichon - in Mém. Mus. Natl. Hist. Nat. 1950: 168
Pichon - in Bull. Mus. Hist. Nat. (Paris). 1947: 298
P.T. Li et al. - in Fl. China. 1995: 154
R.Br. - in PROSEA. 1993: 82
Pichon - in Bull. Mus. Hist. Nat. (Paris). 1947: 300
Tsiang & P.T. Li - in Fl. Reipubl. Popularis Sin. 1977: 88
Lý - in Feddes Repert. 1986: 613
R.Br. - in PROSEA. 2001: 61
D.J. Middleton - in Fl. Thailand. 1999: 41
D.J. Middleton - in Tree Fl. Sabah & Sarawak. 2004: 14
Backer & Bakh.f. - in Fl. Java. 1965: 226
Kochummen & Wong - in Blumea. 1984: 515
Pit. - in Lecomte, Fl. Indo-Chine 3. 1933: 1100
Sidiy. - in Blumea. 1998: 77
Cockburn - in Trees Sabah. 1976: 15
K. Schum. - in Engl. & Prantl, Nat. Pflanzenfam. 4. 1895: 138
Lý - in Feddes Repert. 1986: 610
Lý - in Feddes Repert. 1986: 615
K. Schum. - in Engl. & Prantl, Nat. Pflanzenfam. 4. 1895: 125
Tsiang & P.T. Li - in Fl. Reipubl. Popularis Sin. 1977: 95