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. 2016 Jun 2;17(6):851. doi: 10.3390/ijms17060851

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scanning electron microscopy (SEM) microphotographs of the examined pollen species. 1. Castanea mollissima; 2. Prunus yedoensis/Prunus subhirtella/Prunus serrulata; 3. Ligustrum lucidum/Ligustrum sempervirens; 4. Citrus sinensis; 5. Melia azedarach; 6. Flueggea virosa; 7. Hoboellia parviflora/Hoboellia grandiflora; 8. Olea europaea; 9. Amorpha fruticosa; 10. Alniphyllum fortunei; 11. Robinia pseudoacacia; 12. Llex cornuta/Ilex corallina; 13. Pterocarya rhoifolia; 14. Castanopsis echinocarpa; 15. Taraxacum officinale/Taraxacum platypecidium; 16. Pinus tabuliformis/Pinus thunbergii/Pinus nigra/Pinus densiflora/Pinus kesiya/Pinus sylvestris/Pinus tropicalis; 17. Brassica rapa/Brassica napus/Brassica oleracea/Brassica juncea; 18. Elaeagnus umbellata; 19. Helianthus annuus; 20. Adenophora trachelioides/Adenophora remotiflora; 21. Smilax L.; 22. Chenopodium album; 23. Rosaceae; 24. Rosaceae; 25. Violaceae (close to Viola); 26. Compositae (close to Coreopsis, Sigebeckia); 27. Compositae (also similar to Cosmos, Kalimeris, Aster); 28. Aster L. (also similar to Chrysanthemum, Matricaria).