Observations
An erect annual herb, 0.5—3 m tall, stems glabrous, purplish; leaves broadly ovate-orbicular, variable, 6—15 cm long, lobes 3—5, oblong to lanceolate, glabrous or pubescent, purplish, petiole 5—10 cm long; bracteoles of epicalyx 8—12, calyx after anthesis becoming thick-fleshy, 2.5—5.5 cm long, distinctly longer than the fruit, red, corolla 3—5 cm long, not widely open, pinkish to yellow with purple centre; seed reniform, almost glabrous, black brown.
Hibiscus sabdariffa is a short-day plant, and drought tolerant.
Selected Sources
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[135] Burkill, I.H., 1966. A dictionary of the economic products of the Malay Peninsula. Revised reprint. 2 volumes. Ministry of Agriculture and Co-operatives, Kuala Lumpur, Malaysia. Vol. 1 (A—H) pp. 1—1240, Vol. 2 (I—Z) pp. 1241—2444.
[192] Chewonarin, T., Kinouchi, T., Kataoka, K., Arimochi, H., Kuwahara, T., Vinitketkumnuen, U. & Ohnishi, Y., 1999. Effects of roselle (Hibiscus sabdariffa Linn.), a Thai medicinal plant, on the mutagenicity of various known mutagens in Salmonella typhimurium and on the formation of aberrant crypt foci induced by the colon carcinogens azoxymethane and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine in F344 rats. Food and Chemical Toxicology 37(6): 591—601.
[226] Dafallah, A.A. & al Mustafa, Z., 1996. Investigation of the anti-inflammatory activity of Acacia nilotica and Hibiscus sabdariffa. American Journal of Chinese Medicine 24(3—4): 263—269.
[539] Kirdpon, S., Nakorn, S.N. & Kirdpon, W., 1994. Changes in urinary chemical composition in healthy volunteers after consuming roselle (Hibiscus sabdariffa Linn.) juice. Journal of the Medical Association of Thailand 77(6): 314—321.
[680] Mizukami, H., Tomita, K., Ohashi, H. & Hiraoka, N., 1988. Anthocyanin production in callus cultures of roselle (Hibiscus sabdariffa L.). Plant Cell Reports 7(7): 553—556.
[786] Perry, L.M., 1980. Medicinal plants of East and Southeast Asia. Attributed properties and uses. MIT Press, Cambridge, Massachusetts, United States & London, United Kingdom. 620 pp.
[788] Pételot, A., 1952—1954. Les plantes médicinales du Cambodge, du Laos et du Vietnam [The medicinal plants of Cambodia, Laos and Vietnam]. 4 volumes. Centre National de Recherches Scientifiques et Techniques, Saigon, Vietnam.
[810] Quisumbing, E., 1978. Medicinal plants of the Philippines. Katha Publishing Co., Quezon City, the Philippines. 1262 pp.
[914] Siemonsma, J.S. & Kasem Piluek (Editors), 1993. Plant Resources of South-East Asia No 8. Vegetables. Pudoc Scientific Publishers, Wageningen, the Netherlands. 412 pp.
[1015] Tseng, T.H., Hsu, J.D., Lo, M.H., Chu, C.Y., Chou, F.P., Huang, C.L. & Wang, C.J., 1998. Inhibitory effect of Hibiscus protocatechuic acid on tumor promotion in mouse skin. Cancer Letter 126(2): 199—207.
[1016] Tseng, T.H., Kao, E.S., Chu, C.Y., Chou, F.P., Lin Wu, H.W. & Wang, C.J., 1997. Protective effects of dried flower extracts of Hibiscus sabdariffa L. against oxidative stress in rat primary hepatocytes. Food and Chemical Toxicology 35(12): 1159—1164.