Is obviously debatable. GRIN directs to R. r. subsp. landra BUT there are 164 hits at Google Scholar for Raphanus landra & R. landra versus 46 for "Raphanus raphanistrum landra, subspecies landra, subsp. landra, ssp. landra, &c. The GRIN record lists the other synonyms at the R. raphanistrum landra page and not directly on the R. landra one.