Anderson - s.n. 1937 - United States
Anderson - s.n. 1938 - Canada
Anonymous - s.n. - United States
Anonymous - s.n. 1884 - United States
Asclepias exaltata
Athey - 3064 - United States
Batchelder - s.n. 1917 - United States
Batchelder - s.n. 1926 - United States
Blake - s.n. 1880 - United States
Bornstein - 135 - United States
Boufford - 14543 - United States
Boufford - 16554 - United States
Boufford - 8056 - United States
Brumbach - 3376 - United States
Chapman - s.n. 1890 - United States
Chase - 16977 - United States
Churchill - s.n. 1885 - United States
Churchill - s.n. 1886 - United States
Churchill - s.n. 1891 - United States
Churchill - s.n. 1894 - United States
Churchill - s.n. 1899 - United States
Churchill - s.n. 1912 - United States
Churchill - s.n. 1916 - United States
Churchill - s.n. 1925 - United States
Cléonique-Joseph - 5745 - United States
Cowles - s.n. 1869 - United States
Crabtree - s.n. - United States
Daniels - s.n. 1851 - United States
Davis - 1435 - United States
Davis - s.n. 1891 - United States
Drouet - 1616 - United States
Duncan - 1458 - United States
Duncan - 5318 - United States
Duncan - 5504 - United States
Duncan - 6485 - United States
Ferriss - s.n. - United States
Fitzpatrick - 16 - United States
Floden - 560 - United States
Freiberg - s.n. 1912 - United States
Fritchey - s.n. 1857 - United States
Gates - 10483 - United States
Gray - s.n. 1879 - United States
Greenman - 1454 - United States
Greenman - 1455 - United States
Greenman - 2277 - United States
Hall - s.n. 1863 - United States
Hanes - s.n. 1939 - United States
Hermann - 8989 - United States
Hess - 9664 - United States
Hitchcock - s.n. 1888 - United States
Holm - s.n. 1913 - United States
House - 2314 - United States
James - s.n. 1974 - United States
Kline - s.n. 1954 - United States
Lapham - s.n. 1841 - United States
Mackenzie - 3170 - United States
Martin - 1998 - United States
Massey - 4662 - United States
Mell - s.n. 1905 - United States
Miller - 5342 - United States
Nieuwland - s.n. 1907 - United States
Nieuwland - s.n. 1911 - United States
Oosting - 3653 - United States
Palmer - 17817 - United States
Palmer - 25670 - United States
Patterson - s.n. 1879 - United States
Perry - s.n. 1882 - United States
Plitt - 726 - United States
Pollock - s.n. 1894 - United States
Pollock - s.n. 1896 - United States
Potter - s.n. 1959 - United States
Reed - 12840 - United States
Reed - 13006 - United States
Reed - 137306 - United States
Reed - 137308 - United States
Reed - 144636 - United States
Reed - 2110 - United States
Reed - 29395 - United States
Reed - 29453 - United States
Reed - 29769 - United States
Reed - 29806 - United States
Reed - 40606 - United States
Reed - 81186 - United States
Reed - 8212 - United States
Reed - 89565 - United States
Reed - 91215 - United States
Reed - s.n.3594 - United States
Rogers - 76363 - United States
Schrenk - s.n. 1892 - United States
Schrenk - s.n. 1893 - United States
Seymour - 507 - United States
Shacklette - 30 - United States
Shafer - s.n. 1885 - United States
Sheldon - s.n. 1879 - United States
Sherman - 2291 - United States
Sherman - s.n. 1875 - United States
Small - s.n. 1891 - United States
Small - s.n. 1892 - United States
Stair - s.n. 1896 - United States
Steele - s.n. 1901 - United States
Steele - s.n. 1903 - United States
Stone - 3941 - United States
Sturtevant - s.n. 1888 - United States
Umbach - s.n. 1895 - United States
Wild Flower Club - s.n. 1955 - United States
Wing - s.n. 1882 - United States
Wislizenus - 1201 - United States