Description
Tall herbs, 50- 120 cm high; stems quadrangular, not or narrowly winged. Leaves simple, opposite, 7 x 1.5 cm, elliptic, narrowed to a broad petiole, acute at apex, 3-ribbed. Cymes terminal, in many flowered corymbs; bracts 7 mm long, linear. Calyx 9 mm long, 4- lobed, lobes ovate, abruptly cuspidate with a cuspidate 2 mm broad wings. Corolla blue or white with blue shades, tube short, lobes 4, to 20 x 8 mm, elliptic, acute. Stamens 4, anthers 8 mm long, slightly curved, eglandular, filaments broaden at base. Ovary 2-celled, ovules many; stigma subcapitate. Capsule globose; seeds small, many.Exacum tetragonum, the bicolor Persian violet, is a species of plant in the Gentianaceae family. Its natural habitat is subtropical or tropical moist grassy forests, and it blooms in late monsoon. The plant likely is pollinated mainly by butterflies and other insects.
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