- Hieracium rigorosum
"Hieracium rigorosum", a name for a plant in the hawkweed genus "Hieracium", has been identified as synonyms of two different species:
*"
Hieracium canadense "cite web
url = http://planthardiness.gc.ca/plant_chklist.pl?speciesid=1004579
title = Hieracium umbellatum L.
accessdate = 2007-12-27
author = Natural Resources Canada
date = 2007-12-21
format = HTML
work = Canada's Plant Hardiness Site
publisher = Government of Canada ]
*"Hieracium laevigatum "cite web
url = http://plants.usda.gov/java/profile?symbol=HILA4
title = PLANTS Profile for Hieracium laevigatum (smooth hawkweed)
accessdate = 2007-12-23
author = Natural Resources Conservation Service
authorlink = Natural Resources Conservation Service
year = 2007
format = HTML
work = The PLANTS Database
publisher = USDA, Baton Rouge, LA 70874-4490 USA. ]References
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