
I don't know what that says about either Lewis and Clark or the guides.
Interestingly, no one seems to be completely sure why Roman candles are named as such. The OED ducks the issue slightly, claiming that it might be "probably after a parallel compound in another European language," but not making a definitive ruling. They do offer two additional comments, however; first, that it was perhaps a "reference to the transmission of the firework technique from China to Europe via the Eastern Roman (Byzantine) Empire," and secondly that "it is possible that Roman candle originated in English and was semantically motivated by anti-Catholic feeling."
ETA: typo fixing. Alas.