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Title from cover.
Previous ed. published in 1 vol.: 1999?
pt. 1. Erodium species checklist
pt. 2. Geranium species checklist
pt. 4. Pelargonium
pt. 6. Superseded genera of pelargonium
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Geraniaceae Knuth Tribe I Geranieae by R. T. F. Clifton. ISBN 1899742654. Published by Geraniaceae Group in 2004. Publication and catalogue information, links to buy online and reader comments.