Achillea ptarmica subsp. macrocephala var. speciosa ("Ezonokogiriso")

Japanese name: エゾノコギリソウ （蝦夷鋸草）
Scientific name: Achillea ptarmica subsp. macrocephala var. speciosa

[Overview]
A perennial 10–80 cm tall, growing in grasslands.
The leaves are simple and alternate, oblong to lanceolate-linear, 3–7 cm long and 0.5–1 cm wide, with fine serrations on the margin but not deeply divided.
The leaf base has no lobes and slightly clasps the stem.
Corymb-like inflorescences at the stem tips bear white flower heads.
The flower heads are large, 1–3 cm across, with 12–19 ray florets arranged in 2 rows.
The tubular florets are white.
The involucre is hemispherical, and the scales of the involucre and receptacle are densely hairy.
The fruit is an achene.

[Uses]
The whole plant is used medicinally.

View this page in Japanese (日本語)