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

植株25-50厘米，一次结果，全株无。

Stem straight, glabrous, muricate near nodes.

茎直，无，粗糙的近的节。

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

嫩茎圆柱常地四棱形或似翼的，无，被，短，或被绒的，通常后脱落。

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，很少倾斜或攀援的，无，很少短，枝常无刺。

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

花瓣通常5，很少更多，偶尔无，白色，粉红色，或红色，无或有，边全缘，很少啮蚀。