Classification Hierarchy
Kingdom Plantae
Subkingdom Tracheophyta
Superdivision Spermatophyta
Division Magnoliophyta
Class Magnoliopsida
Subclass Asteridae
Order Asterales
Family Asteraceae
Genus Achillea
Species Achillea millefolium
Common Yarrow

Date: June 14, 2009. Location: Kent Park(map)


Scientific Name: Achillea millefolium. Achillea in honor of Achilles; millefolium -thousand leaf, probably in reference to the many leaflets of the deeply divided leaves.

Common Name: Common Yarrow

Origin: Some infra-taxa Native and some Introduced

Notes: Achillea millefolium is morphologically variable. More than 50 names have been used to describe separate species or varieties of a single species.

Additional references: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.

Field Marks for Identification:

Flowers: May; Inflorescence, heads 10 to many in simple or compound corymbiform arrays. Phyllaries in 2 or 3 layers. Ray florets usually 5; corollas white or light pink to purple. Disk florets 2-20 per head; corollas white. Fruit: cypselae 1-2 mm long with margins winged.

Leaves: atlernate, sessile to petiolate, compound - two or three times pinnatifid.

Glossaries of botanical terms: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

Common Yarrow-1 Common Yarrow-2 Common Yarrow-3 Common Yarrow-4