Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Achene and seedling morphology of Asteraceae weed species from south-central Chile. I.

Abstract

Seeds and seedlings of weed species belonging to the Asteraceae are described. The studied taxa were Bidens pilosa, Carduus pycnocephalus, Centaurea melitensis, Cichorium intybus [chicory], Cirsium vulgare, Conyza bonariensis, Galinsoga parviflora, Hypochaeris radicata, Lactuca serriola, Leontodon taraxacoides, Picris echioides, Senecio vulgaris, Silybum marianum, Sonchus oleraceus and Taraxacum officinale. For each species the morphology of the following growth stages, according to Lancashire et al. [Annals of Applied Biology (1991) 119 561-601], are described: dry seed (00), unfolded cotyledons (10), first true leaf or leaf pair unfolded (11) and two to five true leaves unfolded (12-15). Original drawings and photographs accompany each description.