Why does "Viola nuttallii" match "Viola" (Levenshtein distance=10) at Overall Score=0.50 whereas "Viola nuttalium" (Levenshtein distance=3) does not, even if you lower the match threshold to zero? Of course, Levenshtein distance is only one component of the Overall Score, but still, LD=3 is a way closer match than LD=10.
Also note that "Viola nuttallium" matches to "Viola nuttallii" with an Overall Score of 0.96, despite differing by an addition of only one letter from "Viola nuttalium".
Why does "Viola nuttallii" match "Viola" (Levenshtein distance=10) at Overall Score=0.50 whereas "Viola nuttalium" (Levenshtein distance=3) does not, even if you lower the match threshold to zero? Of course, Levenshtein distance is only one component of the Overall Score, but still, LD=3 is a way closer match than LD=10.