Anonymous - s.n. -
Asclepias incarnata
Churchill - s.n. 1899 - United States
Engelmann - s.n. 1824 - Germany
Hayhurst - s.n. 1902 - United States
Holms - s.n. 1888 - United States
Longbottom - 14055 - United States
Longino - 79107 - United States
Naylor - UMO 27324 - United States
Nee - 62370 - United States
Nee - 66121 - United States
Nee - 66141 - United States
Nee - 66205 - United States