Title: Biblio RTF Export
Author: Biblio 7.x

N. Lord Britton and Brown, A., An Illustrated Flora of the Northern United States, Canada And The British Possessions, 2nd ed., vol. 3. Charles Scribner?s Sons, 1913.

N. Lord Britton and Brown, A., An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian (1913). New York : C. Scribner?s sons, 1913.

P.  Hoffmann, ?Compositae?, in Die Natürlichen Pflanzenfamilien, vol. 4(5), A.  Engler and Prantl, K., Eds. Leipzig: Engelmann, 1894, pp. 87-387.

H. A.  Gleason, Illustrated Flora of the Northeastern United States and Adjacent Canada, vol. 3. New York: Hafner Press. A Division of Macmillian Publishing Co., INC, 1952, pp. 503-505.

J. L.  Strother, Flora of North America, vol. 19. New York: Oxford University Press, Inc., 2006, pp. 202-203.