Pandorea jasminoides

Stratified phloem (Fig. 19D), marked by the alternation of fiber bands, interrupted only by the rays, with areas of sieve tubes and axial parenchyma (Fig. 19D). Conducting phloem composed of sieve tubes solitary or in multiple of 2-3 (Fig.19E), intermingled by axial parenchyma cells (Fig. 19E). Sieve plates varying from almost transverse end walls and simple sieve plates, to inclined with 4-5 sieve areas. One companion cell lying on the corner of the sieve tube (Fig. 19E) or two companion cells, each on opposite sides of the sieve tube (Fig. 19E). Companion cells in strands of 2-4 cells. Axial parenchyma diffuse (Fig. 19D, E), abundant, in strands of four cells. Course of rays straight (Fig. 19D). Rays bi- to triseriate, heterocellular mixed, with procumbent, square and upright cells intermixed across the entire ray. Rays taller than 1 mm, as seen in tangential section. Rays slightly dilated in the outermost portions of the nonconducting phloem. Rays do not sclerify, not even when touching the fiber bands (Fig. 19D, E). Sclerenchyma composed of fibers, polygonal to rectangular in shape (Fig. 19D, E). Fibers in tangential bands of 2-3 cells, interrupted by the rays (Fig. 19D, E). Non-storied. Nonconducting phloem marked by empty sieve elements and companion cells, collapsed. Cell expansion common, dilatation of rays, no further sclerification seen. Pericyclic fibers forming a ring of discrete strands before a remaining cortex. Single periderm, phellem non-stratified, with evenly thin-walled cells, phelloderm non-stratified, thick, with three or more cell layers (Fig. 19F).