Images of Celosia cultivars https://www.google.com/search?q=yellow+celosia+argentea+plumosa&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjRu8Gyu7LTAhWH14MKHT3-C3IQ7AkIMw&biw=1722&bih=822#imgrc=rA3I1xH-JJNQtM:

3rd image- Maybe a yellow cultivar in the Celosia genus, this could be plumed cockscomb (Celosia argenta var. plumosa)? Link below with more information. https://en.wikipedia.org/wiki/Celosia_argentea

2nd plant image, again it will be a guess only since I don’t know what the rest of the plant looks like. Maybe common dandelion (Taraxacum officinale). https://en.wikipedia.org/wiki/Taraxacum_officinale

List of for more Vachellia/Acacia species. https://en.wikipedia.org/wiki/Vachellia

Hello Christine, Not able to see more of all three plants i.e. the whole plant, close up details of leaves, stems, fruits/seedpods, etc… those details will help narrow down their IDs. I could only suggest some of the possible genera for them. 1_ Maybe a species in the Acacia genus. According to sources some of the species growing in Africa include umbrella thorn acacia (Vachellia tortilis syn. Acacia tortilis), Sweet thorn (V. karroo), scented-pod/thorn Acacia (V. nilotica syn. A. nilotica). These are just a few for you to check out and see if you have a match. Link below is for scented thorn acacia, you could Google the two Acacia species for more information. To keep it not so confusing, I will post the photos of 2 & 3 in separate posts. Best wishes! https://en.wikipedia.org/wiki/Vachellia_nilotica