The plant family Apocynaceae was named and described by Antoine Laurent de Jussieu in Genera Plantarum in 1789.
All the plants I have grown or that are wildflowers on the farm that were members of the plant family Asclepiadoideae (the Milkweed Family) are now members of Apocynaceae. It is strange that Huernia and Stapelia are in the same family as the Asclepias. Of course, there are many genera of succulents, perennials, and trees (ETC.) in this HUGE family… I suppose they have a few things in common we can see at a glance.
As of 12-21-21 when this page was last updated, Plants of the World Online listed 366 genera in the plant family Apocynaceae. Those numbers could change as updates are made on POWO.
You can click on the plant names in the caption under the photos to go to the plant’s page.
I found my first Apocynum cannabinum (Hemp Dogbane) in the main hayfield in 2020 but since then it has ventured… In 2021, I noticed a large patch in the south hayfield. It is also growing in the ditch along the street in front of the garden and front pasture. A friend sent a photo of a big patch of weeds in a pasture for me to identify… It was this species. I would say the Hemp Dogbane could get out of hand if the conditions are right.
I was finally able to take photos of the Ascpelias syriaca flowers on June 16, 2021.