. Biochemical systematics. Biochemical variation; Botany. 280 BIOCHEMICAL SYSTEMATICS are common in seed plants. All groups of the gymnosperms, except the Gnetales, contain some tannin producers. Among angiosperms, the monocot families Palmae, Musaceae, and Iridaceae are notably tanniniferous. Dicot families of the orders Fagales, Rosales, and Myrtales are particularly rich in tannins. They are rare or absent in the families Gramineae, Caryophyllaceae, Cruciferae, Cacta- ceae, Chenopodiaceae, Labiatae, Umbelliferae, and Primulaceae (Skene, 1934). Tannins are probably best considered as phenoli
. Biochemical systematics. Biochemical variation; Botany. 280 BIOCHEMICAL SYSTEMATICS are common in seed plants. All groups of the gymnosperms, except the Gnetales, contain some tannin producers. Among angiosperms, the monocot families Palmae, Musaceae, and Iridaceae are notably tanniniferous. Dicot families of the orders Fagales, Rosales, and Myrtales are particularly rich in tannins. They are rare or absent in the families Gramineae, Caryophyllaceae, Cruciferae, Cacta- ceae, Chenopodiaceae, Labiatae, Umbelliferae, and Primulaceae (Skene, 1934). Tannins are probably best considered as phenolics. In fact the non-hydrolyzable, condensed tannins are flavonoid derivatives. These are complex polymers which may form insoluble products (often called phlobaphenes). Famihar examples of condensed tannins are derivatives of catechin or gallocatechin. Their relationship to antho- cyanins and leucoanthocyanins is obvious. OH OH HO. OH HO. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Alston, Ralph E; Turner, B. L. (Billie Lee), 1925-. Englewood Cliffs, N. J. , Prentice-Hall
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