Ecological trends in the xylem

No ecological groups could be found. Differences are, at least in some cases, related to taxonomic units, e.g. for Ixanthus, Blackstonia and Centaurium, Gentiana section Gentianae: Gentiana lutea, G. punctata and Gentiana section Pneumonanthe: Gen-tiana asclepiadea.

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Fig. 16. Groups of sieve tubes in the radially-oriented parenchymatic tissue of the phloem. Rhizome of a 20 cm-high perennial plant, dry meadow, mountain zone, Alps, France. Gentiana cruciata, transverse section.

Fig. 17. Acicular crystals (small needlelike crystals) in the phloem. Rhizome of a 20 cm-high perennial plant, dry meadow, mountain zone, Alps, France. Gentiana cruciata, transverse section, polarized light.

Fig. 16. Groups of sieve tubes in the radially-oriented parenchymatic tissue of the phloem. Rhizome of a 20 cm-high perennial plant, dry meadow, mountain zone, Alps, France. Gentiana cruciata, transverse section.

Fig. 17. Acicular crystals (small needlelike crystals) in the phloem. Rhizome of a 20 cm-high perennial plant, dry meadow, mountain zone, Alps, France. Gentiana cruciata, transverse section, polarized light.

Left Fig. 18. Tangential rows of sieve-cell groups at the periphery of the pith (medullary phloem) and in the phloem. Long shoot of a 70 cm-high dwarf shrub, laurel forests, subtropical climate, Gomera, Canary Islands. Ixanthus viscosus, transverse section.

Right Fig. 19. Vascular bundles at the periphery of the pith (medullary phloem). Annual shoot of a 50 cm-high flowering perennial plant, meadow, Jura mountains, France. Gentiana punctata, transverse section.

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