Ambrosia artemisiifolia L.

Common ragweed
Ambrosia_artemisiifolia_01 Ambrosia_artemisiifolia_02 Ambrosia_artemisiifolia_03

Description 1

Annual plant reaching up to 80cm in height. Reddish stalks that are somewhat ribbed, erect and with little hairs. Wide compound and toothed leaves that are 5-10 cm long, green on the top and furry on the top and bottom with white hairs. The male flowers are green-yellow grouped in large spikes, whilst the female ones are individual or in small groups in the axils of the barely visible sessile upper leaves. It produces a brown, dry fruit called achene which is 3-4 mm long and 1-2 mm wide, with 5-8 thorns in the form of a crown.

Biology 1

It flowers from June to November. It reproduces only by means of seed, of which there are many (30,000-40,000 per plant) and they create a settlement of seeds that stays in the soil (5-14 years). Epizoochory (birds),wind, water and anthropochory dispersal. Germination from May onwards.

Habitat 1

A pioneer plant, it colonises areas where the natural vegetation has been changed (agriculture, road networks, embankments, etc. and also on beaches), it prefers dry, nitrogen-rich soil with a neutral or slightly acidic PH balance. Somewhat thermophilic.

Sources 1

Spanish Catalogue of Exotic Invasive Species and Document sheets of the Exotic Invasive Species Act 630/2013 (GEIB)

Spanish Catalogue of Exotic Invasive Species - Flora 1

http://www.mapama.gob.es/es/biodiversidad/temas/conservacion-de-especies/especies-exoticas-invasoras/ce_eei_flora.aspx

Fuentes y Créditos

  1. Adaptado por INVASORES - administrador de un trabajo de (c) cartotragsatec, algunos derechos reservados (CC BY-SA), http://natusfera.gbif.es/guide_taxa/1930

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