COMMON YARROW, Achillea
millefolium L. 1, plant in flower; 2, disk flower;
3, ray flower; 4, flower head; 5, root system. Perennial,
reproducing by seed and underground rhizomes. Stems 1 to 2 feet
(30 to 60 cm) tall, branching at top, covered with grayish-green hairs.
Each crown may produce several stems. Leaves soft, covered with
hairs, finely divided, fernlike. Basal leaves longer than those attached
to stems. Flower heads small with 5 to 10 white ray flowers
and yellow disk flowers, in flat-topped clusters at top of branches. Pink-flowered
forms occur rarely. Seed tiny, flat, oblong, white or gray. Found
in meadows, pastures, and waste places; not common in cultivated fields.
Persists mostly on thin soil where conditions are unfavorable for the growth
of more desirable plants. The plant has an offensive odor and bitter taste.