Leaves of a horsetail
Thin leaves originating at the joints are noticeable on the horsetail plant. Horsetails were once used as scrubbing brushes and were nicknamed scouring brushes.
Source
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"OpenStax College, Seedless Vascular Plants. October 17, 2013."
http://cnx.org/content/m44640/latest/Figure_25_04_03.jpg
OpenStax CNX
CC BY 3.0.
