Mystery solved

image from http://gstuff.co.nz

Found out today from dad's friend that the seeds are Mirabilis jalapa or more commonly "4 o'clock" flowers. I looked the seeds up online and they are practically the same as the ones i have. They can be used in xeriscaping, which is fantastic in case i forget to water them and they bloom in the summer. ...so i missed my opportunity to see them this season. I have no idea what will become of the ones i planted just now but i shouldn't have a problem if i plant them in early spring.

They're like a mix between the datura metel and my hibiscus. They should be a good fit to the little plant gang I've been accumulating.

Notes for spring:
Light: Four o'clocks do best in full sun, but also perform well in partial shade. 
Propagation: Plant seeds in early spring or divide tubers any time. If you soak the large black seeds in water overnight before planting they will germinate quicker. If you get one that you like especially, you can dig up the tuber at the end of the season and replant it next spring. Four o'clocks will self seed. The large, elongate tubers make it difficult to transplant very large specimens.