Adams - 300 - United States
Anderson - s.n. 1904 - United States
Anderson - s.n. 1933 - United States
Anonymous - s.n. 1882 - United States
Asclepias purpurascens
Athey - 224 - United States
Ayers - s.n. 1989 - United States
Becker - 1665 - United States
Benke - 5572 - United States
Benson - s.n. 1930 - United States
Bernhardt - 2011-02 - United States
Bernhardt - SH-04 - United States
Bohn - s.n. 1932 - United States
Bohn - s.n. 1933 - United States
Bojnansky - NA-70-56 - United States
Bornstein - 292 - United States
Brant - 7727 - United States
Brant - 871 - United States
Brant - 901 - United States
Broadhead - s.n. - United States
Brooks - 17471 - United States
Brown - 1982-18 - United States
Brown - 57 - United States
Bush - 12769 - United States
Bush - 356 - United States
Bush - 470 - United States
Bush - 7612 - United States
Bush - 974 - United States
Bussey - s.n. 1905 - United States
Chang - 518 - United States
Chase - 292 - United States
Chickering - s.n. 1877 - United States
Child - s.n. 1928 - United States
Christ - s.n. 1931 - United States
Churchill - s.n. 1871 - United States
Churchill - s.n. 1882 - United States
Churchill - s.n. 1887 - United States
Churchill - s.n. 1895 - United States
Churchill - s.n. 1916 - United States
Churchill - s.n. 1918 - United States
Clausen - 5453 - United States
Clinebell II - 118 - United States
Cole - s.n. - United States
Comte - 479 - United States
Conrad - 1943 - United States
Correll - 18829 - United States
Correll - 18853 - United States
Croat - 75220 - United States
Cunningham - s.n. 1934 - United States
Daniels - s.n. 1896 - United States
Daniels - s.n. 1903 - United States
Daniels - s.n. 1904 - United States
Darigo - 2160 - United States
Davidse - 148 - United States
Davidse - 161 - United States
Davidse - 3477 - United States
Davidse - 39956 - United States
Davis - 7522 - United States
Davis - 7603 - United States
Davis - 7609 - United States
DeLozier - 1162 - United States
Dewart - s.n. 1892 - United States
Dickson - s.n. 1927 - United States
Drew - s.n. 1940 - United States
Drouet - 3043 - United States
Drushel - 10907 - United States
Drushel - 2786 - United States
Duerinck - s.n. 1833 - United States
Dunn - 13997 - United States
Dunn - 21405 - United States
Eaglesfield - 98 - United States
Eby - s.n. 1889 - United States
Eby - s.n. 1890 - United States
Eggert - s.n. 1875 - United States
Ellis - 618 - United States
Ellis - 657 - United States
Etter - 229 - United States
Etter - 262 - United States
Fernald - 12168 - United States
Fernald - 12169 - United States
Fishbein - 2820 - United States
Fishbein - 6559 - United States
Fishbein - 6908 - United States
Fry - BF97-32 - United States
Galen - 27 - United States
Gereau - 1148 - United States
Gibson - 3558 - United States
Graves - s.n. 1920 - United States
Gray - s.n. 1851 - United States
Greenman - 3908 - United States
Greenman - 5100 - United States
Hayden - s.n. - United States
Henderson - 03-101 - United States
Henderson - 65-358 - United States
Henderson - 66-480 - United States
Henderson - 67-915 - United States
Henderson - 69-269 - United States
Henderson - 92-195 - United States
Henderson - 92-243 - United States
Henderson - 94-346 - United States
Henderson - 94-363 - United States
Henderson - 96-387 - United States
Hinterthuer - 203 - United States
Hinterthuer - 378 - United States
Hitchcock - s.n. 1888 - United States
Holmberg - 2957 - United States
Holmberg - 5346 - United States
Hubricht - B1517 - United States
Hubricht - B2132 - United States
Hubricht - B2161 - United States
Hudson - s.n. 1993 - United States
James - 1088 - United States
Jeffrey - UMO 12531 - United States
Jones - 4705 - United States
Kellogg - 1110 - United States
Kellogg - 25976 - United States
Kellogg - 26050 - United States
Kellogg - s.n. 1902 - United States
Kellogg - s.n. 1911 - United States
Kellogg - s.n. 1929 - United States
Kennedy - RK99-44 - United States
Kennedy - RK-MO-6-7-06-1 - United States
Kramer - s.n. 1991 - United States
Lammers - 9415 - United States
Lapham - s.n. - United States
Latham - 24532 - United States
Lemon - 33 - United States
Letterman - s.n. 1896 - United States
Letterman - s.n. 1912 - United States
Looney - s.n. 1929 - United States
Mackenzie - 140 - United States
Mackenzie - 1453 - United States
Mackenzie - 2759 - United States
Mackenzie - 286 - United States
Mackenzie - 288 - United States
Mason - s.n. 1935 - United States
Maupin - 574 - United States
McCoy - 6018 - United States
McFarland - 5328 - United States
Miller - 4281 - United States
Miller - 5207 - United States
Moe - 05-18 - United States
Mohlenbrock - 21322 - United States
Mohn - 5-21-12-2 - United States
Mohn - 6-19-13-10 - United States
Moldenke - 1299 - United States
Monell - s.n. 1891 - United States
Mueller - s.n. 1935 - United States
Ness - P-3-32 - United States
Ness - P-4-10 - United States
Nieuwland - 11717 - United States
Nieuwland - s.n. 1908 - United States
Norton - 120/73 - United States
Norton - s.n. 1900 - United States
Ohba - 86609 - United States
Palmer - 15642 - United States
Palmer - 17933 - United States
Palmer - 18644 - United States
Palmer - 213 - United States
Palmer - 21491 - United States
Palmer - 2235 - United States
Palmer - 23328 - United States
Palmer - 34957 - United States
Palmer - 36016 - United States
Palmer - 36665 - United States
Palmer - 50071 - United States
Palmer - 55788 - United States
Palmer - 55869 - United States
Palmer - 55910 - United States
Palmer - 5749 - United States
Palmer - 57921 - United States
Palmer - 68624 - United States
Pammel - s.n. 1888 - United States
Perry - s.n. - United States
Plitt - s.n. 1903 - United States
Price - s.n. 1900 - United States
Prinzie - 139 - United States
Raven - 27033 - United States
Raven - 27176 - United States
Raven - 27531 - United States
Redfearn Jr. - 10105 - United States
Redfearn Jr. - 21387 - United States
Reed - 139621 - United States
Reed - 13994 - United States
Reed - 142997 - United States
Reed - 143894 - United States
Reed - 15339 - United States
Reed - 26038 - United States
Reed - 4562 - United States
Reed - 50958 - United States
Reed - 56951 - United States
Reed - 57339 - United States
Reed - 6176 - United States
Reed - 7345 - United States
Reed - 79743 - United States
Reed - 7976 - United States
Reed - 81639 - United States
Reed - s.n. 1890 - United States
Reed - s.n.3568 - United States
Reed - s.n.4655 - United States
Richardson - s.n. 1938 - United States
Rickett - s.n. 1929 - United States
Ridgway - 2580 - United States
Riehl - s.n. - United States
Ryan - 1284 - United States
Schuette - 2544 - United States
Schuette - 2891 - United States
Schuette - 3162 - United States
Seymour - 1531 - United States
Sherman - s.n. 1875 - United States
Shimek - s.n. 1902 - United States
Shimek - s.n. 1904 - United States
Smith - 2501 - United States
Smith - 3305A - United States
Smith - s.n. 1881 - United States
Smith - s.n. 1884 - United States
Solomon - 225 - United States
Solomon - 963 - United States
Stevens - 3677 - United States
Steyermark - 10760 - United States
Steyermark - 1379 - United States
Steyermark - 23164 - United States
Steyermark - 24220 - United States
Steyermark - 5659 - United States
Steyermark - 5897 - United States
Steyermark - 8189 - United States
Steyermark - 9572 - United States
Sturtevant - s.n. 1889 - United States
Sturtevant - s.n. 1890 - United States
Summers - 1009 - United States
Summers - 5970 - United States
Summers - 6714 - United States
Tadych - BT99-38 - United States
Tadych - RSH-112 - United States
Taylor - 5941 - United States
Taylor - s.n. 1885 - United States
Trelease - s.n. 1889 - United States
Turner - 14-103 - United States
Ukropina-Crawford - 9 - United States
Vogt - 509 - United States
Wheeler - 4884 - United States
Wislizenus - 347 - United States
Woodson, Jr. - 5 - United States