This is nearly the perfect book for the Haworthia collector as it is in alphabetical order (yes!!) and is excellently illustrated with large, high quality, beautiful photographs. There is section on cultivars, variegated plants and 'not Haworthias' (aka look-alikes) that is splendidly illustrated as well. And thankfully also a nice section on cultivation which is priceless. It doesn't have EVERYTHING in it, but it comes pretty close. I really have no complaints about this book other than I still have a very hard time identifying plants in this genus, as many are identified primarily on where they came from South Africa and not necessarily how they look... weird genus!