To illustrate Dr. Satish post on Apocynaceae family, I am posting this tree. All pictures taken in Kolkata- of flowers in October'2007 & others in Feb.'07.
Alstonia scholaris (Apocynaceae, commonly called Blackboard tree, Indian devil tree, Ditabark, Milkwood pine, White cheesewood and Pulai; syn.
Echites scholaris L. Mant.,
Pala scholaris L. Roberty) is an
evergreen, tropical tree native to the
Indian subcontinent and
Southeast Asia
Alstonia scholaris is a small tree that grows up to 40 m tall and is
glabrous. The bark is greyish;
branchlets are copiously
lenticellate. The upperside of the leaves are glossy, while the underside is greyish.
[1] Leaves occur in
whorls of 3-10;
petioles are 1-3 cm; the leathery leaves are narrowly
obovate to very narrowly
spatulate, base cuneate, apex usually rounded; lateral veins occur in 25-50 pairs, at 80-90° to midvein.
Cymes are dense and pubescent;
peduncle is 4-7 cm long.
Pedicels are usually as long as or shorter than
calyx. The
corolla is white and tube-like, 6-10 mm; lobes are broadly
ovate or broadly obovate, 2-4.5 mm, overlapping to the left. The ovaries are distinct and pubescent. The
follicles are distinct and linear. Seeds of
A. scholaris are oblong, with ciliated margins, and ends with tufts of hairs 1.5-2 cm.
[2] The bark is almost odourless and very bitter, with abundant bitter and milky
sap.
The bark contains the
alkaloids ditamine,
echitenine and
echitamine and used to serve as an alternative to
quinine. At one time, a
decoction of the bark was used to treat
diarrhoea and
malaria, as a tonic,
febrifuge,
emmenagogue,
anticholeric and
vulnerary. A decoction of the leaves were used for
beriberi.
[1] The bark is used in
homoeopathy for its tonic bitter and astringent properties; it is particularly useful for chronic diarrhoea and dysentry.
Ayurveda recommends
A. scholaris for bowel complaints. In Sri Lanka its light wood is used for
coffins. In
Borneo the wood close to the root is very light and of white colour, and is used for net floats, household
utensils,
trenchers, corks, etc.
[4]