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$modus 1: smartphone
Pterocaulon pycnostachyum
Pterocaulon pycnostachyum (Michx.) Elliott [Accepted]
Compositae
2 851779 Pterocaulon pycnostachyum (Michx.) Elliott [80 271904 Conyza pycnostachya Michx.]
A. Lounsberry, E. Rowan, Southern wild flowers and trees: p. 506, t. 168 (1901) [E. Rowan]
5 851779 Pterocaulon pycnostachyum (Michx.) Elliott [116 271904 Conyza pycnostachya Michx.]
A.J. Cavanilles, Icon. (Cavanilles), vol. 1 : t. 12 (1791) [A.J. Cavanilles]