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Crassulaceae.com - http://www.crassulaceae.com/
Botanical database and photo gallery of the American Crassulaceae. In English and German. |
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Crassulaceae - http://delta-intkey.com/angio/www/crassula.htm
Botanical characteristics of this family of succulent plants with illustrations of several species. |
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The Crassulaceae - http://www.botany.hawaii.edu/faculty/carr/crassul.htm
Information on this family, with a description and photograph of several species. |