Would very much appreciate help to ID these plants. All were found growing in garden in Ghana, West Africa. Their origin/native location - indigenous or imported - is unknown. #1 Photo 13-DSCN4683: ~80 cm (~30 inches) high, hard erect stalks, 2-3 cm diameter (~1 inch) at base. #2 Photo 15-DSCN4685: Desert Rose? Adenium obesum? Except the leave are somewhat heart shaped - indentation at end of leaf instead of a point as in all Adenium obesum pictures I have been able to find. #3 Photo 18-DSCN4688: Cross section is three-pointed star, no spines, small leaves (plant in photo is about 30 cm high (~12 inches) #4 Photo 19-DSCN4689: Opuntia?? No spines on this prickly pear look-a-like. Is it a cactus? #5 Photo 23-DSCN4691: Plant in photo is about 25 cm high (~10 inches) #6 Photo 25-DSCN4692: Cross section is three-pointed star, 2 opposed spines per point, spines about 5 mm long #7 Photo 30-DSCN4695: Cereus?? Spines about 7-10 mm long, three spines per point. Photo in plant is about 60 cm high (~2 feet). Cross section is five sided star.