Koellia

Koellia 包含 17 個子項：

• Koellia fascicularis Greene
• Koellia huronensis Greene
• Pycnanthemum albescens Torr. & A. Gray
• Pycnanthemum beadlei (Small) Fernald
• Pycnanthemum californicum Torr. ex Durand
• Pycnanthemum curvipes (Greene) E. Grant & Epling
• Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenb.
• Pycnanthemum montanum Michx.
• Pycnanthemum nudum Nutt.
• Pycnanthemum pycnanthemoides (Leavenw.) Fernald
• Pycnanthemum setosum Nutt.
• Pycnanthemum torreyi Benth.
• Pycnanthemum verticillatum (Michx.) Pers.
• Pycnanthemum virginianum (L.) T. Durand & B. D. Jacks. ex B. L. Rob. & Fernald
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