If it is of any help, I am posting some more information on propagating this vine. I managed to get this from another discussion group:
Cuttings...it helps to do them in the spring or autumn, use fairly hard tips about 35 cm-45 (14-18") long...use spray-on antitranspirants and gel-type rooting compounds under intermittent mist or bagged. While they will root in 10 days or so under warm moist conditions, they are vexingly prone to dying
after that...even up to the point where they have been transplanted into a pot.
Powdered rooting compounds such as Rootex are not really a good option. Success rate for finished, saleable plants will range from zero (not unusual) to about 25% when the Gods are smiling on you. You can have had nearly 100% success rate for root growth on batches of thick, green stem cuttings only to lose
the whole lot within a month.
One can occasionally get an errant basal stem to root by old-fashioned layering - just place a 5-7 cm section of older stem in a pot filled with a loose, moist medium and cover the stem with a cm or so of the mix while keeping the forward section of the stem decumbent; check for roots every month or so and then cut the stem when the pot is well-filled with them.
Be sure and remove dried leaves as they drop from the stems to avoid accumulations of decomposing matter around the base of the stems.
Mature terminal stem sections that have recently hardened-off root much easier than either woody stems or very new growth, which is almost hopeless.
Like many large vining tropical Fabacs, these critters HATE having their roots disturbed.
viable seed germinates almost instantly and one has a 2 m tall vine in very, very, short order.