Correct spelling for the English word "juncites" is [d͡ʒˈʌnsa͡ɪts], [dʒˈʌnsaɪts], [dʒ_ˈʌ_n_s_aɪ_t_s] (IPA phonetic alphabet).
In geol., fossil stems and leaves apparently related to the juncaceae or rush family.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.