ðə dʒˈɛnəs nˈeɪm wʌz ɡˈɪvən baɪ ðə bˈɑːtɐnˌɪst ʃɹˈɛbɚ ɪn dʒˈɛnɚɹə plˈæntɑːɹɹəm, wˈʌn θˈaʊzənd sˈɛvənhˈʌndɹɪd nˈaɪnti wˈʌn tʊ ˈɑːnɚ ðə mˈɑːɹʃəl fˈæmɪli, ˈʌŋkəl hˈʌmfɹi ænd nˈɛfjuː mˈoʊsᵻz, ʌv pˌɛnsɪlvˈeɪniə.
The genus name was given by the botanist Schreber (in Genera Plantarum, 1791) to honor the Marshall family, uncle Humphry and nephew Moses, of Pennsylvania.