Ageratum conyzoides L

[From Latin, ageratum = a plant that does not wither readily and conyzoides = resembling to conyza]

Common names: White weed, appa grass, conyzoid floss-flower, bastard agrimony, common cocklebur; tahi ayam, tombok jantan, sianggit, ara batu (Malay); babadotan (Indonesian); herbe a madame (French); caycutlon, bu xich, cohoi (Vietnamese).

Physical description: It is a common tropical invasive herb which grows 90 cm annually. The stems are terete and hairy. Leaves: simple, exstipulate, opposite below, and alternate upward. The petiole is 5mm-2.5cm long. The blade is very thin, 2.5cm-7cm long,

Fig. 364. Ageratum conyzoides L.

ovate or cuneate and shows 2-3 pairs of secondary nerves. The apex of the blade is acute and the margin is serrate. The inflorescences are 5 mm in diameter with the capitula arranged in corymbs. The involucres are campanulate and comprise of 2-3 whorls of linear bracts. The flowers are white. The style is purple. The calyx lobes are lanceolate, acuminate and hairy. The fruits consist of black, hairy achenes with persistent calyx lobes (Fig. 364).

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