The carbon chains in plant alkanes are usually odd-numbered, between 27 and 33 carbon atoms in length, and are made by the plants by decarboxylation of even-numbered fatty acids.
ðə kˈɑːɹbən tʃˈeɪnz ɪn plˈænt ˈælkeɪnz ɑːɹ jˈuːʒuːəli ˈɑːdnˈʌmbɚd, bᵻtwˌiːn twˈɛnti sˈɛvən ænd θˈɜːɾi θɹˈiː kˈɑːɹbən ˈæɾəmz ɪn lˈɛŋθ, ænd ɑːɹ mˌeɪd baɪ ðə plˈænts baɪ dᵻkˌɑːɹbəksɪlˈeɪʃən ʌv ˈiːvənnˈʌmbɚd fˈæɾi ˈæsɪdz.