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  International Crassulaceae Network

  http://www.crassulaceae.ch/de/artikel?akID=48&aaID=2&aiID=C&aID=1115

  The principal aim is to help preserve plants of the Crassulaceae family now existing in private as well as in public collections – most important in a time when plant imports have become almost impossible. This aim is best achieved by distributing plants…

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  Flowering Plants. Eudicots: Asterales - Google Books

  https://books.google.de/books?id=VhUZnM8S47IC

  This volume contains a complete systematic treatment of the flowering plant order Asterales. This comprises 12 families with approx. 1,720 genera and about 26,300 species. Identification keys are provided for all genera, and likely phylogenetic…

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