I found these on my land and no one (of the locals) seems to know what they are. The first two are from a tree, the next two a field plant. The area they are in is relatively high elevation as this is the "mountains". The land is very fertile (coffee growing) with a mix of areas of black dirt, sandy soil and fine red powder that turns to slimy mud in the rain.
I agree, Callistemon viminalis And the other looks like Leonotis nepetifolia, which has more globular flower clusters than L. leonurus, with more numerous flowers.
Maybe curious traveller has in mind its psychoactive effects! See http://www.tropilab.com/lionsear.html
Hmmmm... did not know this. Now I really want it :-) That is actually very interesting. I will have to question the villagers a little more closely when I am back. Nobody mentioned medicinal uses of any kind, but the language barrier may have prevented that. Although there is usually reference made, very quickly, to psychotropic effects of plants (lots of signs and gestures are universally understood). If they don't know, I won't tell!!
This plant was grown as a summer planting in the pots at the entrance to the Botanical Garden a few years back. Our summers are generally kind of cool for it, but it bloomed nicely for the warmest period of the summer. Not sure what would be needed to keep the plant over winter in Edmonton. I grew it for a while, years back when I lived in Seattle--kept as a house plant, but outdoors in summer.
If nothing else, I could try growing it from seed each year. When I go back I will collect some seeds and if I can get them through customs, I will plant them next year and let everyone know how they work out. Not right after smoking the flowers... :-)