What is NPC system in botany?

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Tags

1. #three
2. #character
3. #spore
4. #position
5. #pollen
6. #erdtman
7. #aperture
8. #plants
9. #number
10. #classification
11. #straka
12. #accepted
13. #based
14. #system
15. #world
16. #features
17. #palynologists
18. #artificial
19. #proposed