Jan, that is a rather tall order, especially if you are looking for help with garden plants as well as house plants. The Royal Horticultural Society has a book called 'A-Z Garden Encyclopedia' which has been adapted for the US by the American Horticultural Society under a similar name. There is also one called 'Botanica'For specifically house plants, I would start with 'The Encyclopedia of House pLants'. Barnes and Noble have done a printing of this. Sunset Books have a great series, and their 'Western Garden Book' brings a lot of stuff together.
I know that the choice is bewildering, but you are probably better off with your several more specialised books anyway. The encyclopedic types have to be a bit superficial if they are to be of a size that you can handle. Derek