Corkscrew Form

A descriptor for the typical appearance of Campylobacter and Helicobacter species. Spirochetes—e.g., Treponema pallidum—also have a corkscrew appearance, but are longer and thus often described as having a helical morphology
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Beyond colour and peeling bark, stems come in twisted or corkscrew form. The twisted hazel, Corylus avellana Contorta and Salix matsudana Tortuosa are the best for borders as they respond well to pruning and can be kept shrub-size.