(under subclass 263) Plant which belongs to the genus Exacum.
(1) Note. Exacum is characterized as a biennial or perennial glabrous plant which is erect, densely branched, sessile, or branched simple, entire leaves; flowers cymose, leafy, forking or solitary, four to five lobed calyx bear corolla which are salviform to rotate, tubular-cylindric, and having four to five lobes which are ovate to oblong.
(2) Note. E. affine which is a popular house plant may also be called German violet or Persian violet.
