roots several, slender, terete.

fruit obovoid, turbinate, clavate, or terete, small, 5-ribbed or deeply 5-angled, often rough, with sessile, sticky glands.

倒卵球形的果，陀螺状，棍棒状，或圆柱状，小，5棱或深深具5个角，通常粗糙的，具无梗，发粘腺体。

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leaves opposite, fused at base to form short sheath, flat or terete, margin entire.

叶对生，在基部愈合形成短鞘，平的或圆柱状，边缘全缘。

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branches and twigs gray-green to gray-brown, terete, sturdy.

分枝和小枝灰绿色的到灰色棕色，圆柱状，粗壮。

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branches and petioles red when dry, nearly terete, strong, stout, striate or grooved, pilosulose or subglabrous.

分枝和叶柄干燥时红色的，近圆柱状，强壮的，坚固，或具凹槽，具小柔毛或近无毛。

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stem simple or branched, terete, hollow except at nodes.

茎单一或分枝，圆柱状，除在节上之外中空。

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stems flat-terete when young but later terete, glabrous.

茎平圆柱状幼时但是过后的圆柱状，无毛。

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branches and twigs terete; flowers pale yellow.

分枝和小枝圆柱状；花浅黄。

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branches terete, with prominent pith.

圆柱状的枝，具突出的髓。

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branchlets dark brown, terete, with gray lenticels and gray-brown stellate hairs.

暗褐色，圆柱状的小枝，有灰色皮孔和灰棕色星状毛。

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branchlets grayish brown, terete, glabrous.

小枝淡灰棕色，圆柱状，无毛。

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branchlets terete to somewhat quadrangular.

小枝圆柱状的到有点四角形。

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branchlets reddish brown when dry, slender, terete, glabrous.

干燥时的小枝红棕色，细长，圆柱状，无毛。

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branchlets gray or grayish brown, terete, slightly pubescent.

小枝灰色或者淡灰棕色，圆柱状，稍具短柔毛。

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stems erect, terete or angular in upper part, branched from base.

茎直立，圆柱状的或具角在上半部分，分枝自基部。

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internodes terete or flattened with successive internodes at right angles to each other.

节间圆柱状或者变平具连续节间互成直角。

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fruit parted into schizocarps; leaf axis terete.

进分果深裂的果；叶轴圆柱状。

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radicle terete, cotyledons thin.

圆柱状的胚根，瘦的子叶。

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twigs terete, densely brown- or rust-colored hirsute.

小枝圆柱状，浓密棕色或锈色具长硬毛。

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branches gray-black to gray-brown, terete, sturdy, twigs greenish, sometimes with 4 striae.

分枝灰色黑色的到带绿色灰色棕色，圆柱状，粗壮，小枝带绿色的，有时具4个条纹。

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shrubs scandent. branchlets brown-red, terete, glabrous.

攀缘灌木小枝棕色红，圆柱状，无毛。

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