Hey Jack, it's not a century but a millenium! Sometimes those Welwitschias live for 2000 years.
Yes Stinkpot, you can get them on Ebay on occasion but those small strappy leaves in the gigantic/tall pots just don't have that Lovecraftian pizazz of the ancient ones sulking out in the desert!
I have a cutting of Euphorbia caput-medusae. The main species which Hydnora africana infects, if anyone has any H. africana spores laying about - send em my way! lol
I read an article somewhere online where a guy did actually successfully infect his caput-medusae plants with Hydnora. There was pictures on the site and description of how he did it.
Here is Medusa's Head or
Euphobia caput-medusae the main host of
Hydnora africana the "serpents" or "arms" get up to a meter long on this species!
Click the image for a large clear pic
Rafflesias are similar to Hydnora in that they infect Tetrastigma vines and then shoot out these crazy flowers. Infact both these parasites are classed in the same super-order of Rafflesianae. Here is the largest species
Rafflesia arnoldii
Image from back cover of Rafflesias of the World by Jamili Nais. There is somewhere in the book a study of attempts to inoculate Tetrastigma vines with
Rafflesia keithii IIRC but I can't remember if they were successful or not and of course I can't find what page it's on in the book at the moment!