Family • Apocynaceae - Rauwolfia amsoniaefolia A. DC.
|Rauwolfia amsoniaefolia A. DC.|
|Rauwolfia glabra Cav.|
|Cyrtosiphonia amsoniaefolia Miq.|
|Banogan (P. Bis.)|
|Maladita (Bik., Buk.)|
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.
Additional Sources and Suggested Readings
(1) Chemistry and Pharmacology of the Rauwolfia Alkaloids / R A Lucas / Progress in medicinal chemistry, Volume 1 By Gwynn Pennant Ellis
(2) 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.
– 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%.
– 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.