Perennials -
Yarrow
Common Yarrow is
an erect herbaceous perennial plant that produces one to several
stems (0.2 to 1m tall) and has a rhizomatous growth form. Leaves
are evenly distributed along the stem, with the leaves near the
middle and bottom of the stem being the largest. The leaves have
varying degrees of hairiness (pubescence). The leaves are 5-20 cm
long, bipinnate or tripinnate, almost feathery, and arranged
spirally on the stems. The leaves are cauline and more or less
clasping. The inflorescence has 4 to 9 phyllaries and contains ray
and disk flowers which are white to pink. There are generally 3 to
8 ray flowers that are ovate to round. Disk flowers range from 15
to 40. The inflorescence is produced in a flat-topped cluster.
Yarrow grows up to 3500m above sea level. The plant commonly
flowers from May through June, and is a frequent component in
butterfly gardens. Common yarrow is frequently found in the mildly
disturbed soil of grasslands and open forests. Active growth
occurs in the spring.
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