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  1. How Can One Genus Have So Many Species?
    How Can One Genus Have So Many Species?
    Have you ever seen a roadside or a meadow dotted with yellow or orange flowers that look like small dandelions? If so, you might have encountered a member of the genus Hieracium, also known as hawkweeds.
    Description

    Hieracium or hawkweeds, like others in the family Asteraceae, mostly have yellow, tightly packed flower-heads of numerous small flowers but, unlike daisies and sunflowers in the same family, they have not two kinds of … See more

    Distribution

    Hieracium species are native to Africa, Asia, Europe, North America, Central America and South America. See more

    Species

    The classification of Hieracium into species is notoriously difficult. One reason is the apomictic reproduction (in which plants asexually produce seeds), which tends to produce a lot of minor geographical variation. O… See more

    Plant pest

    All species of the genus Hieracium are classed as invasive species throughout New Zealand. They are banned from sale, propagation and distribution under the National Pest Plant Accord. Hieracium is a pasture we… See more

    Further reading

    • Espie, Peter (2001). Hieracium in New Zealand: ecology and management. Mosgiel: AgResearch. ISBN 0-478-20900-2.
    • McCosh, D. and Rich, T.C.G. 209. Hieracium proximum (Caithness Hawkweed… See more

    External links

    Integrated Taxonomic Information System (ITIS). "Standard Report Hieracium". Retrieved 2007-12-18.
    • Nicklas Strömberg. "Hieracium on GlobalTwitcher.com". Images on Hieracium found in Sweden. GlobalTwit… See more

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