+44 1803 865913
By: Bruce Bayer
250 pages, Col photos, col illus, distrib maps
Fills a large gap on available literature on the genus. The book recognises 61 species, 4 subspecies, 137 varieties and 5 forms, including 6 new species, three of which are described for the first time, 27 new varieties and 37 new combinations.
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