Compilation
Ageratum latifolium

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Name

Identification
Ageratum latifolium Cav. [family COMPOSITAE ] Verified by Not on sheet, Ageratum conyzoides L. [family COMPOSITAE ] (stored under name); Verified by Not on sheet,
Related name
  • Ageratum oerstedii
  • Stevia elongata
  • Ageratum not on sheet
  • Ageratum muticum
  • Ageratum conyzoides
  • Ageratum glomerata
  • Ageratum latifolium
  • Calea densiflora
  • Coelestina latifolia
Common name
  • Tropical whiteweed, Flora of North America Vol. 21

Flora

Entry for Ageratum conyzoides Linnaeus [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 21,
Names
Ageratum conyzoides Linnaeus [family COMPOSITAE], Sp. Pl., 2: 839. 1753
Ageratum latifolium Cavanilles [family COMPOSITAE]
Treatment Author(s)
Guy L. Nesom
Information
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.
Phenology
jul-aug (summer)
Altitude range
0–20 m;
Distribution
South AmericaintroducedMexicoWest IndiesCentral AmericaPacific Islands (Hawaii).USA Ala.USA Calif.USA Conn.USA Fla.USA Ga.USA Ky.USA Md.USA Miss.USA Mo.USA N.C.
Discussion
Ageratum conyzoides is apparently native to South America. North American plants were escapes and naturalized from cultivation.
Native/Introduced
introduced;

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