Ageratina altissima, a
0.3-1.3m tall perennial herb originating in North America, is
distributed in various places in this country. Stems are erect and
branch well on the upper parts, with short hairs. Leaves with 2-5cm
long petioles are of opposite phyllotaxis, 7-15cm long, 4-9cm wide,
ovate-shaped, with coarse serrations on margins. The upper part's
stems set many white flowers in a corymbs way. Flower heads comprise
disk florets only. Bloom time: September-October. |
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