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Achillea erba-rotta
''Achillea erba-rotta'', common name Simple Leaved Milfoil, is a perennial flowering plant of the genus ''Achillea'', belonging to the sunflower family.〔(Altervista Flora Italiana, Millefoglio erba-rotta, Simple Leaved Milfoil, Bisam-Schafgarbe, myskröllika, ''Achillea erba-rotta'' All. )〕
==Description==
''Achillea erba-rotta'' is a polymorphic species, as its physical characteristics clearly vary depending on the variety. The biological form is ''chamaephyte'' ''suffruticose'',〔Pignatti S. – Flora d'Italia – Edagricole – 1982. Vol. III, p. 78〕 as these plants have perennating buds borne close to the ground and are woody in the lower part of the stem, with herbaceous yearly branches. The primary root is a rhizome.
This plant reaches on average in height.〔 The stems are woody and creeping, almost glabrous or with short hair and with erect flowering branches. Leaves of sterile branches are lanceolate-spatulate, 5-7 mm wide and 26-30 mm long, with 4-7 teeth on each side.〔 Cauline leaves are alternate, sessile, toothed and progressively linear, about 2-3 mm wide and 11-22 mm long.〔 Flowers are hermaphroditic and pentamerous, arranged in corymbs with many heads, about 3 mm in diameter, with rounded ligules.〔 The flowering period extends from July through August. The fruit is a flattened achene without pappus.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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