American ginseng
Refers specifically to Panax quinquefolius, a herbaceous perennial plant native to North America, used in traditional medicine.
American ginseng is a medicinal plant also called アメリカ人参.
Western carrot cultivars
Used to distinguish Western carrot varieties from the Eastern/Asian carrot (人参). The cross-reference to 人参 sense 1 indicates this is a contrasting term.
See also: 人参
セイヨウニンジン can refer to the common orange carrot.