Description
| - During 2002, 2004, 2006 and 2008, trips were undertaken in the United States and Canada by members of the Department of Botany, PalackA1/2 University in Olomouc (Czech Republic) to record distributions and sample the diversity of wild and weedy Lactuca species. In that period, 16 states in the USA (Arizona, California, Colorado, Idaho, Iowa, Minnesota, Montana, Nevada, New York, North Carolina, Oregon, South Dakota, Utah, Washington, Wisconsin, Wyoming) and two provinces in Canada (Ontario, Quebec) were visited. Seven wild and weedy Lactuca species (L. serriola, L. saligna, L. virosa, L. canadensis, L. biennis, L. floridana, L. ludoviciana), an interspecific hybrid (L. canadensis x L. ludoviciana), and an undetermined Lactuca species were recorded, and 343 seed samples were collected from 200 locations.
- During 2002, 2004, 2006 and 2008, trips were undertaken in the United States and Canada by members of the Department of Botany, PalackA1/2 University in Olomouc (Czech Republic) to record distributions and sample the diversity of wild and weedy Lactuca species. In that period, 16 states in the USA (Arizona, California, Colorado, Idaho, Iowa, Minnesota, Montana, Nevada, New York, North Carolina, Oregon, South Dakota, Utah, Washington, Wisconsin, Wyoming) and two provinces in Canada (Ontario, Quebec) were visited. Seven wild and weedy Lactuca species (L. serriola, L. saligna, L. virosa, L. canadensis, L. biennis, L. floridana, L. ludoviciana), an interspecific hybrid (L. canadensis x L. ludoviciana), and an undetermined Lactuca species were recorded, and 343 seed samples were collected from 200 locations. (en)
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