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Family Apocynaceae
Rauwolfia amsoniaefolia A. DC.

Scientific names Common names
Rauwolfia amsoniaefolia A. DC. Andarayan (Ibn.)
  Banogan (P. Bis.)
  Batikoking (Buk.)
  Maladita (Bik., Buk.)
  Mara-andarayan (Ibn.)
  Sibakong (Tag.)
Rauwolfia amsoniaefolia is an unresolved name. The Plant List

General info
There are four Rauwolfia species reported as native to the Philippines viz. Rauwolfia amsoniaefolia A. DC., R. samarensis Merr, R. membranacea Merr., and R. loheri.

Sibakong is a shrub or small tree with milky juice which reaches a height of about 15 meters but usually smaller. Leaves are ornamental, occurring in whorls, lanceolate, 6 to 12 centimeters in length, 1.5 to 3 centimeters in width, rather narrow and sharply pointed at both ends. Flowers are small, white, fragrant and borne on compound inflorescences. Fruit is somewhat rounded, about 8 millimeters in diameter, and obscurely two-lobed.

- In thickets and secondary forests at low and medium altitudes in Cagayan, Ilocos Norte, Isabela, Pangasinan, Nueva Ecija, Batangas, Camarines Provinces in Luzon; also in Mindoro, Lubang, Masbate, and Mindanao.
- Also occurs in Timor Laut, Kei, and the Tenimber Islands.

- Study yielded a creamish, amorphous alkaloid, amsoniaefoline. (Gomez, Da Silva and Garcis)
- Study on alkaloid content of different parts of the plant showed: stem bark 2.06%. whole root 2.44%, wood of root 1.39%, bark of root 4.16%, leaves 0.96%. (2)

Parts used
Young buds.


- New buds used for stomach disorders of young babies.

Isolation of reserpine and rescinnamine from Rauwolfia amsoniaefolia A. DC: -
- Preliminary analysis of crude drug yielded alkaloids: reserpine, rescinnamine, deserpidine, aricin, yohimbine, methyl reserpate, possibly ajmalicine, and an unidentified alkaloid from the stem bark. Roots yielded the same alkaloids except deserpidine. (2)


Updated May 2019 / December 2013

Additional Sources and Suggested Readings
Chemistry and Pharmacology of the Rauwolfia Alkaloids / R A Lucas / Progress in medicinal chemistry, Volume 1 By Gwynn Pennant Ellis
Studies on Philippine species of Rauwolfia. 1. Isolation of reserpine and rescinnamine from Rauwolfia amsoniaefolia A. DC. / BERNAL RM, VILLEGAS-CASTILLO A, ESPEJO OP. / Experientia. 1960 Aug 15;16:353-5.
Pharmacologic studies on Philippine Rauwolfias. / Gerardo V de Leon

It is not uncommon for links on studies/sources to change. Copying and pasting the information on the search window or using the DOI (if available) will often redirect to the new link page.

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