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Name ReferenceIPCN ReferenceGametophytic CountSporophytic CountCountry 
Sonchus asper (L.) HillRazaq, Z. A., S. Khatoon & S. I. Ali. 1988. A contribution to the chromosome numbers of Compositae from Pakistan. Pakistan J. Bot. 20: 177–189. 90-919 
Sonchus asper (L.) HillKirschner, J., J. Stepanek & J. Stepankova. 1982. In IOPB chromosome number reports LXXVI. Taxon 31: 574–575. 82-83 18
Sonchus asper (L.) HillKYHOS, D. W. & P. H. RAVEN. 1982. Miscellaneous chromosome numbers in Asteraceae. Madroño 29: 62, 274. 82-839II 
Sonchus asper (L.) HillProbatova, N. S. & A. P. Sokolovskaya. 1981. Kariologicheskoe issledovanie sosudistykh rastenij ostrovov Dal'nevostocnogo gosudarstvennogo morskogo sapovednika. Sb. Cvetkaye Rastenija Ostrovov Dalnevostochnogo Morskogo Sapovednika. 92–114. 82-83 18
Sonchus asper (L.) HillNazarova, E. A. 1984. Chromosome numbers in the Caucasian representatives of the families Asteraceae, Brassicaceae, Fabaceae, Limoniaceae. Bot. Zhurn. SSSR 69(7): 972–975. (In Russian). 84-85 18
Sonchus asper (L.) HillMulligan, G. A. 1984. Chromosome numbers of some plants native and naturalized in Canada. Naturaliste Canad. 111: 447–449. 84-859 
Sonchus asper (L.) HillGhaffari, S. M. 1989. Chromosome studies in Iranian Compositae. Iran. J. Bot. 4: 189–196. 88-899 
Sonchus asper (L.) HillPrabha, C. 1989. Interspecific hybridisation in the genus Sonchus L. (Asteraceae). Genét. Ibér. 41: 135–145. 88-899 
Sonchus asper (L.) HillNazarova, E. A. 1989. Karyological and palynological study of representatives of the genus Sonchus from the Caucasus. Bot. Zhurn. (Moscow & Leningrad) 74: 53–59. 88-89 18
Sonchus asper (L.) HillNishikawa, T. 1984. Chromosome counts of flowering plants of Hokkaido (7). J. Hokkaido Univ. Educ., Sect. 2B 35: 31–42. 88-89 18
Sonchus asper (L.) HillGupta, R. C. & B. S. Gill. 1989. Cytopalynology of north and central Indian Compositae. J. Cytol. Genet. 24: 96–105. 88-899 
Sonchus asper (L.) HillParfenov, V. I. & S. A. Dmitrieva. 1988. Kariologicheskaja kharakteristika predstavitelej flory sosudistykh rastenij Berezinskogo biosfernogo zapovednika. Zapov. Belorussii Issl. 12: 3–8. 90-91 18
Sonchus asper (L.) HillNirmala, A. & P. N. Rao. 1984. Karyotype studies in Asteraceae. Cell Chromosome Res. 7: 26–28. 90-91 32
Sonchus asper (L.) HillPrabha, C. 1988. A report of accessory chromosomes in two diploid species of Sonchus L. Cell Chromosome Res. 11: 28–29. 90-91 18
Sonchus asper (L.) HillNirmala, A. & P. N. Rao. 1989. Karyotype studies in some Asteraceae. Cell Chromosome Res. 12: 17–18. 90-91 32
Sonchus asper (L.) HillKiehn, M., E. Vitek, E. Hellmayr, J. Walter, J. Tschenett, C. Justin & M. Mann. 1991. Beiträge zur Flora von Österreich: Chromosomenzählungen. Verh. Zool.-Bot. Ges. Wien 128: 19–39. 90-91 18
Sonchus asper (L.) HillVogt, R. & C. Oberprieler. 1993. Chromosome numbers of north African phanerograms. I. Fl. Medit. 3: 187–210. 92-93 18
Sonchus asper (L.) HillMorton, J. K. 1993. Chromosome numbers and polyploidy in the flora of Cameroon Mountain. Opera Bot. 121: 159–172. 92-93 18
Sonchus asper (L.) HillRazaq, Z. A., A. A. Vahidy & S. I. Ali. 1994. Chromosome numbers in Compositae from Pakistan. Ann. Missouri Bot. Gard. 81: 800–808. 94-959 
Sonchus asper (L.) HillCarr, G. D., R. M. King, A. M. Powell & H. E. Robinson. 1999. Chromosome numbers in Compositae. XVIII. Amer. J. Bot. 86(7): 1003–1013. 98-0018II 
Sonchus asper (L.) HillAlbers, F. & W. Pröbsting. 1998. In R. Wisskirchen & H. Haeupler, Standardliste der Farn- und Blütenpflanzen Deutschlands. Bundesamt für Naturschutz & Verlag Eugen Ulmer, Stuttgart. 98-00 18
Sonchus asper (L.) HillLövkvist, B. & U. M. Hultgård. 1999. Chromosome numbers in south Swedish vascular plants. Opera Bot. 137: 1–42. 98-00 18, 18+3B
Sonchus asper (L.) HillSidhu, M. K. 1979. Distributional and cytological studies of the weed flora of cultivable fields of Patiala district (Panjab). Ph.D. Thesis, Patiala. 1-230. 1979. 79-81918
Sonchus asper (L.) HillBir, S. S. & M. Sidhu. 1980. Cyto-palynological studies on weed flora of cultivable lands of Patiala district (Punjab). J. Palynol. 16: 85–105. 79-81 18
Sonchus asper (L.) HillStrid, A. & R. Franzen. 1981. In Chromosome number reports LXXIII. Taxon 30: 829–842. 79-819II18
Sonchus asper (L.) HillVan Den Brand, C., F. C. M. V. Meel & J. H. Wieffering. 1979. In IOPB chromosome number reports LXIV. Taxon 28: 395–397. 79-81 18
Sonchus asper (L.) HillFernandez Casas, J., A. P. Sorolla & A. Susanna. 1980. Numeros cromosomaticos de plantas occidentales, 48-54. Anales Jard. Bot. Madrid 36: 401–405. 79-81 18
Sonchus asper (L.) HillKuzmanova, B. & S. Georgieva. 1980. In Chromosome number reports LXIX. Taxon 29: 715. 79-81 36
Sonchus asper (L.) HillBir, S. S. & M. Sidhu. 1979. Cytological observations in weed fiora of orchards of Paticla district, Punjab. Recent Res. Pl. Sci. (New Delhi). 7: 261–271. 79-81918
Sonchus asper (L.) HillBelaeva, V. A. & V. N. SIPLIVINSKY. 1976. Chromosome numbers and taxonomy of some species of Baikal flora. Bot. Zhurn. (Moscow & Leningrad) 61(6): 873–880. 75-78 36
Sonchus asper (L.) HillMorton, J. K. 1977. A cytological study of the Compositae (excluding Hieracium and Taraxacum) of the British Isles. Watsonia 11: 211–223. 75-78 18
Sonchus asper (L.) HillNazarova, E. A. 1975. Chromosome numbers of some species of Armenian flora. Biol. Zurn. Armen. 28(1): 95–97. 75-78 18
Sonchus asper (L.) HillGill, L. S. 1978. In IOPB chromosome number reports LX. Taxon 27: 223–231. 75-789 
Sonchus asper (L.) HillGill, L. S. 1978. Chromosome numbers of angiosperms in Tanzania: II. Adansonia 18: 19–24. 75-789 
Sonchus asper (L.) HillKeil, D. J. & D. J. Pinkava. 1976. Chromosome counts and taxonomic notes for Compositae from the United States and Mexico. Amer. J. Bot. 63: 1393–1403. 75-789 
Sonchus asper (L.) HillKuzmanov, B. & S. Georgieva. 1976. In IOPB chromosome number reports LIII. Taxon 25: 483–500. 75-78 18
Sonchus asper (L.) HillLABADIE, J. 1976. Contribution à l'etude caryosystematique des espeees halophiles du littoral languedocier (plus precisement, especes appartenant à la classe des Salicornietea). These, Universite du Languedoc. 222 pp. 75-78 18
Sonchus asper (L.) HillProbatova. 2006. Further chromosome studies on vascular plant species from Sakhalin, Moneron and Kurile Islands. Biodivers. Biogeogr. Kuril Islands Sakhalin 2: 93–110. 04-06 18
 
 
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