æz ʌv tˈuː θˈaʊzənd fˈɪftiːn, ðə dʒˈɛnəs wʌz sˌʌbdᵻvˈaɪdᵻd ˌɪntʊ θɹˈiː sˈɛkʃənz, wˈʌn ʌvwˈɪtʃ wʌz fˈɜːðɚ sˌʌbdᵻvˈaɪdᵻd ˌɪntʊ θɹˈiː sʌbsˈɛkʃənz:
As of 2015, the genus was subdivided into three sections, one of which was further subdivided into three subsections: