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*A shrub or small tree up to 5 m tall; leaves .*Leaves elliptical, obovate or oblong, 7-12.5(-18) cm × 4-6.5 cm, herbaceous, base acute, apex acutely acuminate, with 7-9 secondary veins, dark green above, pale green below, turning black when dried, petiole about 5 mm long, stipules subtruncate with a very long awn; inflorescence .*Inflorescence loose, subpaniculiform, peduncle 2-4.5 cm long, often nodding, with 100-200 flowers; flowers .*Flowers with pedicel 0.5-2 mm long, calyx lobes oblong-triangular, about 1.2 mm long, corolla tube 8-12 mm long, glabrous, lobes 6-7 mm long, acute, white, fragrant, style about 6 mm long exserted, glabrous, anthers 4-6 mm long, violet; fruit .*Fruit globose, black.  ''I. nigricans'' is found in evergreen forest on fertile soils from sea-level up to 800 m altitude.

*[97] Backer, C.A. & Bakhuizen van den Brink Jr, R.C., 1963-1968. Flora of Java. 3 volumes. Noordhoff, Groningen, the Netherlands. Vol. 1 (1963) 647 pp., Vol. 2 (1965) 641 pp., Vol. 3 (1968) 761 pp.*[182] Bremekamp, C.E.B., 1937. The Malaysian species of the genus Ixora (Rub.). Contributions à l'étude de la flore des Indes Néerlandaises XXXIV. Bulletin du Jardin Botanique de Buitenzorg, Série III, 14: 197-367.*[288] Council of Scientific and Industrial Research, 1985. The wealth of India: a dictionary of Indian raw materials & industrial products. Revised Edition. Vol. 1. Publications and Information Directorate, New Delhi, India. 513 pp.*[768] Koorders, S.H. & Valeton, T., 1894-1915. Bijdrage tot de kennis der boomsoorten van Java [Contribution to the knowledge of the tree species of Java]. 13 parts. G. Kolff & Co., Batavia, Dutch East Indies, 's-Gravenhage, the Netherlands.*[1035] Nguyen Van Duong, 1993. Medicinal plants of Vietnam, Cambodia and Laos. Mekong Printing, Santa Ana, California, United States. 528 pp.*[1126] 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.*[1128] 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.*[1591] Wong, K.M., 1989. Ixora Linn. In: Ng, F.S.P. (Editor): Tree flora of Malaya. Vol. 4. Longman Malaysia, Petaling Jaya, Selangor, Malaysia. pp. 356-364. == Main genus page ==*[[Ixora (PROSEA Medicinal plants)|''Ixora'']] (Medicinal plants)

*M.C. Ysrael & J.L.C.H. van Valkenburg