This member of the Apocynaceae family was given this name by Robert Sweet in 1830. It's found in Southern Africa, where it
prefers well-drained soil, some
water and not too much sun, especially not on the caudex. The stem will
reach up to 1,5 meter, and get 15 or even 23 centimetres in diameter. The flowers are white-pink, and it can be
reproduced both by cuttings and seeds.
The caudex will grow much faster, if it is buried, and It won't! stand frost.
The tubes are edible - but hard to enjoy.
The former Pachypodium griquense,
Harriet Margaret Louisa Bolus 1932 is now considered to be a smaller
form of P. s.: Pachypodium succulentum var. griquense,
although I can't find the source.