Kattermann's most important contribution to cactus taxonomy to date was his revision of the genus Eriosyce2, published in 1994. Eriosyce, a mostly Chilean group of globose to almost columnar cacti, are recognized by the presence of wool and bristles on the ovary and perianth tube. The flowers in some species are tubular, brightly colored, and adapted to hummingbird pollination. In his 176-page monograph, Kattermann described and illustrated 33 species, 21 subspecies, and 39 varieties with detailed line drawings and color photographs. This book is supported with contributions by others on systematics, scanning electron micrographs of seeds and pollen, and by an appendix with documentation of all accepted taxa. Several new species are described and numerous new name combinations are also proposed.
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