Hieracium rigorosum

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Hieracium rigorosum, a name for a plant in the hawkweed genus Hieracium, has been identified as synonyms of two different species:

[edit] References

  1. ^ Natural Resources Canada (2007-12-21). Hieracium umbellatum L. (HTML). Canada's Plant Hardiness Site. Government of Canada. Retrieved on 2007-12-27.
  2. ^ Natural Resources Conservation Service (2007). PLANTS Profile for Hieracium laevigatum (smooth hawkweed) (HTML). The PLANTS Database. USDA, Baton Rouge, LA 70874-4490 USA.. Retrieved on 2007-12-23.