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The Shale-barren Rockcress (Arabis Serotina) is a member of the Mustard family. It is an erect
flowering biennial (flowering every two years) adapted to dry conditions and most frequently
found on eroding southern facing slopes. Because it is a biennial, it has two age stages: non-
reproductive and reproductive. As a young plant, it has leaves in the shape of a rosette around its
base. In its reproductive stage, the leaves at the bottom of the plant shrivel and the flowering
stem produces 3 to 41 branches with small flowers of white or creamy petals that are produced
from June to September.
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