Ageratum conyzoides Sieber ex Steud. (redirected from: Eupatorium conyzoides)
Family: Asteraceae
[Eupatorium conyzoides ]
Ageratum conyzoides image
Marie Fourdrigniez  

Annuals, perennials, or sub-shrubs, 20-150 cm (fibrous-rooted). Stems erect, sparsely to densely villous. Leaf blades ovate to elliptic-oblong, 2-8 × 1-5 cm, margins toothed, abaxial faces sparsely pilose and gland-dotted. Peduncles minutely puberulent and sparsely to densely pilose, eglandular. Involucres 3-3.5 × 4-5 mm. Phyllaries oblong-lanceolate (0.8-1.2 mm wide), glabrous or sparsely pilose (margins often ciliate), eglandular, tips abruptly tapering, subulate, 0.5-1 mm. Corollas usually blue to lavender, sometimes white. Cypselae sparsely strigoso-hispidulous; pappi usually of scales 0.5-1.5(-3) mm, sometimes with tapering setae, rarely 0. 2n = 20, 40.

Flowering Jul-Aug. Disturbed sites, mostly coastal; 0-20 m; introduced; Ala., Calif., Conn., Fla., Ga., Ky., Md., Miss., Mo., N.C.; South America; introduced, Mexico; West Indies; Central America; Pacific Islands (Hawaii).

Ageratum conyzoides is apparently native to South America. North American plants were escapes and naturalized from cultivation.

Ageratum conyzoides image
Marie Fourdrigniez  
Ageratum conyzoides image
Ahmad Fuad Morad  
Ageratum conyzoides image
Ahmad Fuad Morad  
Ageratum conyzoides image
Vishal Bhave