Compositae source details
(1966). Brittonia 18
311698
1966
Publication
Date
action
by
Ambrosia pannosa W.W.Payne (original description)
Ambrosia parvifolia W.W.Payne accepted as Ambrosia dentata (Cabrera) M.O.Dillon (original description)
Helianthus nuttallii subsp. canadensis R.W.Long accepted as Helianthus nuttallii subsp. nuttallii Torr. & A.Gray (original description)
Helianthus nuttallii subsp. rydbergii (Britton) R.W.Long (original description)
Porophyllum warnockii R.R.Johnson (original description)
Ambrosia parvifolia W.W.Payne accepted as Ambrosia dentata (Cabrera) M.O.Dillon (original description)
Helianthus nuttallii subsp. canadensis R.W.Long accepted as Helianthus nuttallii subsp. nuttallii Torr. & A.Gray (original description)
Helianthus nuttallii subsp. rydbergii (Britton) R.W.Long (original description)
Porophyllum warnockii R.R.Johnson (original description)
