Adenia glauca, Schinz

Romero, Giovanna E., 2022, Stem and caudex anatomy of succulent plant species, Adansonia (3) 44 (10), pp. 81-90 : 87

ADENIA GLAUCA SCHINZ

Stem cortex has chloroplasts ( Fig. 3G ). Wood is parenchymatous. The axial matrix is formed by sparsely clusters of gelatinous, libriform fibers, parenchyma cells and vessels. Radial system uniseriate and multiseriate. Some uniseriate rays have lignified cells mainly where ray parenchyma cells meet the vessels. Clusters of fiber caps (primary phloem) are above every vascular bundle and appear separated of the vascular bundle due to expansion of parenchyma cells in between them ( Fig. 3G, H ). Functional secondary phloem is in each bundle. Pith was not fixed.

Caudex cortex has chloroplasts and some amyloplasts.Wood is parenchymatous and formed by successive cambium ( Fig. 3I ). In between each ring of vascular cambium, conjunctive tissue is present as bands of parenchyma cells ( Fig. 4A ). Axial system is formed by bands of libriform fibers, septate fibers, gelatinous fibers ( Fig. 4B ), axial vasicentric parenchyma and scalariform or circular bordered pitting vessels. Ray system is proliferated multiseriate and amyloplasts are found in it. Some functional secondary phloem and few non-functional are in each vascular bundle ( Fig. 4C ). Pith was not available.

Figures

FIG. 3. — Transverse sections of stems and caudices: A, B, Pelargonium carnosum (L.) L’Hér.; A, stem, wood; B, stem, bands of libriform fibers; C-E, Moringa drouhardii Jum.; C, stem, diffused fibrous wood, lignification in ray parenchyma cells; D, stem, radial section; E, stem, secondary phloem dilatated; F, Oxalis megalorrhiza Jacq., stem, wood; G-I, Adenia glauca Schinz; G, green stem, cortex and phloem fiber caps; H, green stem, parenchymatous wood; I, caudex, parenchymatous wood. Abbreviations: lf, libriform fibers; r, rays; p, parenchyma cells; fp, fiber cap; sp, secondary phloem. Scale bars: 50 µm.

FIG. 4. — Transverse sections of stem and caudices, unless otherwise noted: A-C, Adenia glauca Schinz; A, caudex, conjunctive tissue; B, caudex, wood gelatinous fibers; C, caudex, parenchymatous wood; D-E, Cyphostemma juttae (Dinter & Gilg) Desc.; D, stem, multiseriate rays; E, caudex, parenchymatous wood; F, caudex wood, vasicentric enlarged axial parenchyma. Abbreviations: mr, multiseriate rays; sp, secondary phloem; ct, conjunctive tissue; p, enlarged parenchyma cells. Scale bars: 50 µm.