Authorities, p. 3

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Gronovirus Fl. Virg
Hook. Fl. Bor. Am. 1840
Hook & Arn Bot. Beechy 1841
Host Gram Aust 1801-3
Hudson Fl. Angl 1778
Jacq. Call.
Humb. Bomp. & Kith N Gen
Kunth Gram
Enum 1833
Lam. Encyc. 1783
Illus 1791
Lapham. Wis. Ag. Fr. vol 3 1833
Linn Sp 1753
Neg. Sypt 1784
Supp. 1781
American Acad
Mant.
Link, Hort 1827
Enum
Michx Til 1803