. Biochemical systematics. Biochemical variation; Botany. FATTY ACIDS 131 carbon-methyl flavonoid component of wax is suspected (Price, 1962). For separation of alkanes, the techniques of gas chromatography and mass spectrography are utihzed together. Purdy and Truter (1961) have compared the surface hpids of leaves of sixty three species, using thin layer chromatography to sep- arate mixtures. Characteristic patterns were obtained for each species. It was also demonstrated that the patterns did not change with the age of the plant. The work of Eglinton et al. (1962) is of unusual interest and
. Biochemical systematics. Biochemical variation; Botany. FATTY ACIDS 131 carbon-methyl flavonoid component of wax is suspected (Price, 1962). For separation of alkanes, the techniques of gas chromatography and mass spectrography are utihzed together. Purdy and Truter (1961) have compared the surface hpids of leaves of sixty three species, using thin layer chromatography to sep- arate mixtures. Characteristic patterns were obtained for each species. It was also demonstrated that the patterns did not change with the age of the plant. The work of Eglinton et al. (1962) is of unusual interest and in- dicates that wax constituents may be of exceptional taxonomic value. These workers chromatographed unfractionated extracts of alkanes, using only 40 g. of dried samples, and obtained a complete analysis of straight chain and branched chain alkanes of 23 to 35 carbons. Some of their results are shown in Fig. 7-2. The variety of patterns dis- closed by their data suggests wide application of these methods in taxonomy. The patterns of alkanes derived from individual species are apparently quite constant. A study of Aeonium urbicum (Crassulaceae) collected from various places and including immature and even dead Crassulaceae 13 -il4 ' vA 15 Scrophularicceae Euphorbiaceae 17 ^ Gramineae Liliaceae Solonaceae Cruciferoe 18 19. JX 21 t 1 1 1 1 22 1 1 I 1 r—1 1 1 23 ^1 1 ^'' —n t |-| 25 26 -1 1 -| r- 27 n 1 limn n r 28 n 1. 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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