TY. Yes, I've read that too. This sentence is intriguing, "...rarely with a conspicuous geniculum." Which implies that sometimes it is conspicuous. If so, the search words I've tried failed to find any pics to help educate my eyes.
"Usually the genicular area is somewhat firmer than the remainder of the petiole and sometimes it is differently colored but it is usually neither swollen nor so conspicuously distinct as in Anthurium. Typically the genicular area is the same shape as the remainder of the petiole, but sometimes the cross-sectional shape is different, being more frequently bluntly ribbed and often rather deeply cracked or scurfy around the circumference (perhaps owing to the bending in relation to changes in light). The geniculum, when apparent is sometimes thicker than the remainder of the petiole as in P. brunneicaule, P. ferrugineum, P. heleniae, P. tenue. It may be darker than the petiole as sometimes in P. bakeri or P. glanduliferum or slightly paler as in P. ferrugineum or P. scalarinerve."
This sounds like it could apply to the original plant of this discussion. The petiole changes color and shape as it joins the leaf.
