There's two wood species called "lemonwood".
One is also called satinwood; it's from Sri Lanka and India. It's dull yellow with a medium texture and fairly heavy. Often has a nice, light figure to it. It's not very good for bows.
The other is the 'classic' lemonwood, also called degame; it's from Cuba and the Carribean area. It's very heavy, close grained and with fine texture. It's excellent in (backed) bows. It has been used extensively up to a few decades ago, when it became scarce and expensive.
Both wood species are expensive. Make sure to get the right 'lemonwood'.