Stems terete, striate, with small bullate tubercles, more dense when mature. 茎圆柱状，具条纹，有小小瘤，成熟时非常紧密。
Corolla white, white flushed pink, rarely pale yellow; calyx red or tinged red; adaxial leaf surface not bullate. 花冠白色，白色的奔流的粉红色，很少浅黄；红色的或微染的花萼红色；叶正面不具泡状隆起。
Terminal cymose panicles or subracemes, many flowered; sepals broadly ovate or triangular-ovate, outer sepals palmately to pinnately laciniate; adaxial surface of leaves prominently bullate or not. 顶生的密伞圆锥花序或近总状花序，多花的；掌状的萼片宽卵形的或三角状卵形，外部萼片到条裂成羽状；显著具泡状隆起的叶子的正面与否。(81
