North American perennial with apparently whorled leaves and showy white purple - tinged flowers.

葉片呈螺旋狀開略帶紫色白花的北美紫菀.

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North American herb having whorled leaves and terminal clusters of small pinkish or purple flower heads.

北美的一種雜草,具有帶紫色或帶紫斑色的輪生葉,頂端有頭狀花序.

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A submersed Old World Plant ( Hydrilla verticillata ) having whorled , lance - shaped leaves and unisexual, solitary, axillary flowers.

軟水草一種生在水中的東半球植物 ( 黑藻黑藻屬 ),葉片呈螺紋形、矛 狀, 雌雄異株, 花為單生 、 腋生.

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Any of various plants of the genus Asperula, having whorled leaves and small funnel - shaped flowers.

化石蕨類植物的一科, 是以莖上顯著呈螺旋排列的葉座為特征.

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