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

植25-50厘米，一次结果，毛。

Stem straight, glabrous, muricate near nodes.

茎直，毛，粗糙的近的节。

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

嫩茎圆柱状到经常地四棱形似翼的，毛，被微柔毛，短柔毛，被绒毛的，通常后脱落。

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

灌木木，通常直立，很少倾斜攀援的，毛，很少短柔毛，枝经常刺。

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，白色，粉红色，红色，毛有毛，边缘，很少啮蚀状。