What is the Japanese name for Saxifraga (rockfoil) genus of plants (or any more well-known species within this genus) and how is it written in rōmaji?
It's ユキノシタ(属), or yukinoshita(-zoku) in romaji. See ユキノシタ属 on Wikipedia. ユキノシタ is the name of:
- an order (ユキノシタ目 Saxifragales)
- a family (ユキノシタ科 Saxifragaceae)
- a genus (ユキノシタ属 Saxifraga)
- a species (ユキノシタ Saxifraga stolonifera)
Etymologically, ユキ is "snow", ノ is "-'s", and シタ is "beneath/under". So it's literally "under-snow".
You can easily find such information using "Language" links on Wikipedia.