North American perennial with apparently whorled leaves and showy white purple - tinged flowers.
叶片呈螺旋状开略带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.
北美的一种杂草,具有带紫色或带紫斑色的轮生叶,顶端有头状花序.
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A submersed Old World Plant ( Hydrilla verticillata ) having whorled , lance - shaped leaves and unisexual, solitary, axillary flowers.
软水草一种生在水中的东半球植物 ( 黑藻黑藻属 ),叶片呈螺纹形、矛 状, 雌雄异株, 花为单生 、 腋生.
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Any of various plants of the genus Asperula, having whorled leaves and small funnel - shaped flowers.
化石蕨类植物的一科, 是以茎上显著呈螺旋排列的叶座为特征.
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