Manual of the botany of the northern United States : including the district east of the Mississippi and north of North Carolina and Tennessee, arranged according to the natural system Gray, Asa, 1810-1888 creator text book New York Ivison, Phinney, Blakeman 1867 1867 5th ed.
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ENG Austin, Coe Finch Danslow, H. M., Rev. Frodin 2 : 14/15. Botany Plants United States https://www.biodiversitylibrary.org/bibliography/56618 15012425 04031552 10.5962/bhl.title.56618