Integrated Taxonomic Information System entry for Brassica rapa L.
Brassica rapa L. is a well studied member of the Brassica genus of plants. Some search terms relevant to your work:
Brassica rapa
Brassica (without any species name)
trichome hairs (try with or without quotation marks; in quotes is better in many cases)
Related terminology that might be of use:
Triangle of U - name of a theory about the evolution and relationship of Brassica species
Ploidy - the number of sets of chromosomes in a cell, which varies in Brassica species
