glabrous

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

植株25-50厘米，一次果，全株无。

2.Stem straight, glabrous, muricate near nodes.

茎直，无，粗糙近节。

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

嫩茎圆柱状到经常地四棱形或略似翼，无，被微柔，短柔，或被绒，通常后脱落。

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

灌木或小乔木，通常直立，倾斜或攀援，无，短柔，枝经常无刺。

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

花瓣通常5，更多，偶尔无，白色，粉红色，或红色，无或有，边全缘，啮蚀状。

6.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.

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