One can check on a particular plant in the USDA's national Plants database:

http://plants.usda.gov


al

Allen Dart, RPA, Executive Director
Old Pueblo Archaeology Center
PO Box 40577
Tucson AZ  85717-0577   USA
    520-798-1201 office, 520-798-1966 fax
    Email: [log in to unmask]
    URL: www.oldpueblo.org

Disclosure: Old Pueblo Archaeology Center's Executive Director Allen Dart
is a USDA Natural Resources Conservation Service cultural resources
specialist who volunteers his time to Old Pueblo. Views expressed in Old
Pueblo Archaeology Center communications do not necessarily represent
views of the U.S. Department of Agriculture or of the United States.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


On Fri, July 27, 2012 3:57 am, paul courtney wrote:
Lyle

Try http://www.invasivespeciesinfo.gov/

paul



On 26/07/2012 23:16, Lyle E. Browning wrote:
> Tangent Warning:
>
> I have again encountered a Poncirus trifoliata in my surveys,
> fortunately not up close and personal, but from a revisited and updated
> survey I did in 1991. So, in looking up when it entered use in the USA,
> nobody got nuttin, apart from generalities. A native of China and Korea
> and able to stand cold weather. OK, fine. But it's all over the south
> and mid-west and is used as a hedge at Fort Knox. This thing has thorns
> that do serious damage at least 10 feet before they stick you and they
> go through anything.
>
> In general my question is: has anyone done a list of plants that have
> immigrated to North America and when their first mention in the lit or
> other notice was recorded?
>
> Tulips and daffodils were once more valuable than gold. Other plants
> have medicinal as well as "keep away" values, as is seen if you Google
> the nasty little plant. Vinca major and Vinca minor area associated with
> ornamental beds and with graveyards. Poinsettias come from the Mexican
> War if I remember correctly and Yucca is either the Sp-Am War or perhaps
> western expansion.
>
> My long way around question is whether anyone has done a list of plants
> and when they first appear? And if so, is it computerized?
>
> Thanks in advance,
>
> Lyle Browning, RPA
>