JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT)is collaborating with JSTOR to digitize, preserve and extend access to Taxon. SummaryThe discovery of betalains and specific P-type sieve-tube plastids in Halophytum, a genus which has been treated as both a member of Chenopodiaceae as well as a distinct family, confirms the alignment of the genus with the nine betalain-containing families of the Centrospermae all of which have characteristic P-type sieve-tube plastids.

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SummaryThe discovery of betalains and P‐type sieve‐tube plastids in Petiveria and Agdestis (Phytolaccaceae) supports the assignment of these genera to the Centrospermae.

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. . International Association for Plant Taxonomy (IAPT) is collaborating with JSTOR to digitize, preserve and extend access to Taxon. Pop 1975 -P-type sieve-element plastids and betalains in Portulacaceae (including Ceraria, Portulacaria, Talinella). Canad. J. Bot. 53: 2103-2109. ECKARDT, T. 1964 -Centrospermae. In Melchior, H. (ed.): A. Engler's Syllabus der Pflanzenfamilien. Berlin-Nikolassee. pp. 79-IO8.

The presence of specific P-type sieve-element plastids is reported for 16 and betalains for 14 species of Portulacaceae. The micromorphology of sieve-element plastids and the presence of betalains support a closer relationship of the Portulacaceae to the Aizoaceae than to the Caryophyllaceae. Three genera, Ceraria, Portulacaria, and Talinella, previously treated as doubtful members of the Portulacaceae, cannot be distinguished from members of the Basellaceae on the basis of plastid subtypes since the two families have identical subtypes; however, the data do confirm their alignment with the Portulacaceae–Basellaceae family group.