It is a perennial herb, growing to about 15-40 cm tall, sometimes taller.
白色、淡黄色、紫色、紫红色
The inflorescence is terminal, elongated, up to half or one-third the length of the stem, with small bract-like bracts.
The stems are mostly solitary or 4-6 in number, hollow, slightly angular, and sparsely hairy or nearly hairless.