glabrous

Young stems terete to frequently 4-angled or subalate, glabrous, puberulous, pubescent, or tomentose, often glabrescent.

嫩茎圆柱状到地四棱形或略似翼，无毛，被柔毛，短柔毛，或被绒毛，后脱落。

Plant 25–50 cm, monocarpic, glabrous throughout.Caudex simple.

植株25-50厘米，一次结果，全株无毛。

Shrubs or small trees, usually erect, rarely viny or climbing, glabrous, rarely pubsecent, branches often inermous.

灌木或小乔木，立，很少倾斜或攀援，无毛，很少短柔毛，枝无刺。

Stem straight, glabrous, muricate near nodes.

茎，无毛，粗糙近节。

Petals usually 5, rarely more, occasionally absent, white, pink, or red, glabrous or hairy, margin entire, rarely premorse.

花瓣5，很少更多，偶尔无，白色，粉红色，或红色，无毛或有毛，边全缘，很少啮蚀状。

Shrubs evergreen or sometimes semievergreen; branchlets and pedicels not setose. Leaf blade adaxially glabrous; corolla creamy yellow, lined and flushed rose on outside. Fl. May–Jun.

有时绿灌木或半绿；小枝和花梗不具刚毛。叶片正面无毛；在外面上花冠米黄色，线形和带玫瑰色；花期5月6月。