1.Plant 25–50 cm, monocarpic, glabrous throughout.Caudex simple.
植25-50厘，，无毛。
2.Stem straight, glabrous, muricate near nodes.
茎直，无毛，粗糙的近的节。
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的，无毛，被微柔毛，短柔毛，或被绒毛的，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，很少倾斜或攀援的，无毛，很少短柔毛，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，很少更多，偶尔无，白色，粉红色，或红色，无毛或有毛，边缘，很少啮蚀状。
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.
25-50厘
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