Zaluzianskya katherinae or night phlox is a perennial herb with a spreading growth form. It grows to about 50 cm in height.
The leaves are obovate and broadly serrated with very short petioles. The leaves nearer the base are opposite while those higher up are alternate. The stems are hairy and green when young, greyish brown when older.
The flowers are axillary and sessile. Each has a short green calyx and long narrow petal tube, opening up into a cup formed by five deeply forked lobes. The petal lobes are white on the inside and pinkish purple on the outside.
The flowers have a strong fragrance particularly noticed at night, which may have given rise to the common name of night phlox. The flowers are also only partly open in daylight, but fully so at night, being nocturnal.
The plant may bloom all year round, but usually more profusely in summer (www.suncrestnurseries.com).