| 0 | PI 600830 | 'REDSKIN' | Dahlia sp. | California, United States | OPGC | | Not Available | 1982 | DEVELOPED | | | | | | Cultivar | | 1140101 | PI 600830 |
| 1 | PI 458751 | CATARINA | Dahlia sp. | Guatemala | | | Historic | 1981 | COLLECTED | 03/1981 | | | | | | Plants 2-3m tall. Flowers 12-15cm in terminal clusters, light lavender pink. Common in coffee plantations. Resembles wild dahlias in Chiapas State, Mexico. | 1353687 | PI 458751 |
| 2 | PI 442360 | | Dahlia sp. | Mexico | | | Historic | 1979 | COLLECTED | 11/18/1979 | Nueva Esperanza and vicinity, Municipio de Motozintla, Chiap as | | | | | Shrub or small tree. Flowers compound, rosy lavender, 7cm diam., appearing in autumn. Local name Dahlia silvestre. | 1337296 | PI 442360 |
| 3 | PI 442361 | | Dahlia sp. | Mexico | | | Historic | 1979 | COLLECTED | 11/01/1979 | Overpass No. 53, Carretera Orizaba-Puebla, P. Forest edge, c ool, dry site | | 2460 | | | Plants low, straggling, to 0.6m tall. Flowers single, rosy-lavender, 7cm diam. | 1337297 | PI 442361 |
| 4 | PI 377761 | T.C. 58 | Dahlia scapigera (A. Dietr.) Knowles & Westc. | Leinster, Ireland | OPGC | | Not Available | 1972 | DONATED | 11/24/1972 | | | | | Uncertain improvement status | Compositae. | 1566607 | PI 377761 |
| 5 | PI 377762 | T.C. 127 | Dahlia scapigera (A. Dietr.) Knowles & Westc. | Leinster, Ireland | OPGC | | Not Available | 1972 | DONATED | 11/24/1972 | | | | | Uncertain improvement status | Compositae. | 1566114 | PI 377762 |
| 6 | PI 319340 | 22198 | Dahlia sp. | Colima, Mexico | OPGC | | Not Available | 1967 | COLLECTED | NEAR 11/1966 | Along road to Manzanillo. 13 miles southwest of Giudad Colima road fork. | | 1400 | | Wild material | Herb, 3-4 dm high. Stems thick. Dried flowers on base branches. | 1566113 | PI 319340 |
| 7 | PI 262385 | | Dahlia sp. | Maryland, United States | | | Historic | 1959 | DONATED | 12/30/1959 | | | | | | | 1566984 | PI 262385 |
| 8 | PI 194878 | No. 2853 | Dahlia sp. | Guatemala | | | Historic | 1951 | COLLECTED | 03/24/1951 | | | | | | | 1671707 | PI 194878 |
| 9 | PI 150022 | 'California Giants, mixed' | Dahlia sp. | Pennsylvania, United States | | | Historic | 1944 | COLLECTED | | | | | | | | 1886749 | PI 150022 |
| 10 | PI 150023 | 'Coltness Hybrids, single' | Dahlia sp. | Pennsylvania, United States | | | Historic | 1944 | COLLECTED | | | | | | | | 1885529 | PI 150023 |
| 11 | PI 150024 | 'Unwin's Dwarf Hybrids, mixed' | Dahlia sp. | Pennsylvania, United States | | | Historic | 1944 | COLLECTED | | | | | | | | 1885532 | PI 150024 |
| 12 | PI 159022 | 'California Giants, mixed' | Dahlia sp. | Pennsylvania, United States | | | Historic | 1944 | COLLECTED | | | | | | | | 1885525 | PI 159022 |
| 13 | PI 144182 | No. 39.2352 | Dahlia sp. | La Paz, Bolivia | | | Historic | 1942 | COLLECTED | | | | 2700 | | | | 1871966 | PI 144182 |
| 14 | PI 117939 | No. 3651 | Dahlia sp. | Minas Gerais, Brazil | | | Historic | 1936 | COLLECTED | 08/01/1936 | Bello Horizonte seed stores | | | | | | 1827349 | PI 117939 |
| 15 | PI 112264 | No. 3517 | Dahlia coccinea Cav. | Oaxaca, Mexico | | | Historic | 1935 | COLLECTED | 09/12/1935 | Monte Alban | | | | | | 1491986 | PI 112264 |
| 16 | PI 103005 | | Dahlia merckii Lehm. | New Zealand | | | Historic | 1933 | COLLECTED | | | | | | | | 1791328 | PI 103005 |
| 17 | PI 97748 | No. 28 | Dahlia sp. | Chile | | | Historic | 1932 | COLLECTED | 01/16/1932 | | | | | | | 1494891 | PI 97748 |
| 18 | PI 92347 | No. 89 | Dahlia sp. | Chiapas, Mexico | | | Historic | 1931 | COLLECTED | 02/28/1931 | Along road between San Cristobal and Tenejapa | | 1174 | | | | 1779006 | PI 92347 |
| 19 | PI 90952 | No. 17250 | Dahlia sp. | Sachsen-Anhalt, Germany | | | Historic | 1931 | COLLECTED | | | | | | | | 1775629 | PI 90952 |
| 20 | PI 80689 | Flor de Santa Catarina | Dahlia imperialis Roezl ex Ortgies | Chiquimula, Guatemala | | | Historic | 1929 | COLLECTED | | | | 542 | | | | 1744518 | PI 80689 |
| 21 | PI 73687 | | Dahlia imperialis Roezl ex Ortgies | Guatemala, Guatemala | | | Historic | 1927 | COLLECTED | | | | | | | | 1496997 | PI 73687 |
| 22 | PI 67356 | | Dahlia merckii Lehm. | England, United Kingdom | | | Historic | 1926 | COLLECTED | | | | | | | | 1719680 | PI 67356 |
| 23 | PI 64286 | | Dahlia pinnata Cav. | Lima, Peru | | | Historic | 1925 | COLLECTED | | | | | | | | 1498678 | PI 64286 |
| 24 | PI 64518 | | Dahlia sp. | Ciudad de México, Mexico | | | Historic | 1925 | COLLECTED | | Cayoacan | | | | | | 1498716 | PI 64518 |
| 25 | PI 56664 | | Dahlia imperialis Roezl ex Ortgies | Chimaltenango, Guatemala | | | Historic | 1923 | COLLECTED | | | | | | | | 1502538 | PI 56664 |
| 26 | PI 56665 | | Dahlia imperialis Roezl ex Ortgies | Chimaltenango, Guatemala | | | Historic | 1923 | COLLECTED | | | | | | | | 1656915 | PI 56665 |
| 27 | PI 51345 | | Dahlia sp. | Aguascalientes, Mexico | | | Historic | 1920 | COLLECTED | | | | | | | | 1505979 | PI 51345 |
| 28 | PI 51086 | No. 425 | Dahlia sp. | Costa Rica | | | Historic | 1920 | COLLECTED | 07/06/1920 | | | | | | | 1505921 | PI 51086 |
| 29 | PI 51087 | No. 426 | Dahlia sp. | Costa Rica | | | Historic | 1920 | COLLECTED | 07/06/1920 | | | | | | | 1618798 | PI 51087 |
| 30 | PI 51088 | No. 427 | Dahlia sp. | Costa Rica | | | Historic | 1920 | COLLECTED | 07/06/1920 | | | | | | | 1618799 | PI 51088 |
| 31 | PI 51089 | No. 428 | Dahlia sp. | Costa Rica | | | Historic | 1920 | COLLECTED | 07/06/1920 | | | | | | | 1618800 | PI 51089 |
| 32 | PI 51090 | No. 429 | Dahlia sp. | Costa Rica | | | Historic | 1920 | COLLECTED | 07/06/1920 | | | | | | | 1618801 | PI 51090 |
| 33 | PI 49757 | 'Santa Catarina' | Dahlia imperialis Roezl ex Ortgies | Guatemala, Guatemala | | | Historic | 1920 | COLLECTED | 02/20/1920 | | | | | | | 1617159 | PI 49757 |
| 34 | PI 49758 | No. 303 | Dahlia coccinea Cav. | Guatemala, Guatemala | | | Historic | 1920 | COLLECTED | 02/17/1920 | | | 1950 | | | | 1617160 | PI 49758 |
| 35 | PI 49326 | 'Single white' | Dahlia imperialis Roezl ex Ortgies | Alta Verapaz, Guatemala | | | Historic | 1920 | COLLECTED | 12/27/1919 | | | | | | | 1616684 | PI 49326 |
| 36 | PI 49327 | 'Double white' | Dahlia imperialis Roezl ex Ortgies | Alta Verapaz, Guatemala | | | Historic | 1920 | COLLECTED | 12/27/1919 | | | | | | | 1616685 | PI 49327 |
| 37 | PI 49328 | 'Double lilac' | Dahlia imperialis Roezl ex Ortgies | Alta Verapaz, Guatemala | | | Historic | 1920 | COLLECTED | 12/27/1919 | | | | | | | 1616686 | PI 49328 |
| 38 | PI 47552 | | Dahlia merckii Lehm. | Zuid-Holland, Netherlands | | | Historic | 1919 | COLLECTED | 06/02/1919 | | | | | | | 1502946 | PI 47552 |
| 39 | PI 47553 | | Dahlia pinnata Cav. | Zuid-Holland, Netherlands | | | Historic | 1919 | COLLECTED | 06/02/1919 | | | | | | | 1612965 | PI 47553 |
| 40 | PI 47554 | 'Paeoniaeflora' | Dahlia pinnata Cav. | Zuid-Holland, Netherlands | | | Historic | 1919 | COLLECTED | 06/02/1919 | | | | | | | 1612966 | PI 47554 |
| 41 | PI 47555 | | Dahlia sp. | Zuid-Holland, Netherlands | | | Historic | 1919 | COLLECTED | | | | | | | | 1650698 | PI 47555 |
| 42 | PI 47354 | | Dahlia imperialis Roezl ex Ortgies | Provence-Alpes-Côte-d’Azur, France | | | Historic | 1919 | COLLECTED | | | | | | | | 1612337 | PI 47354 |
| 43 | PI 45578 | | Dahlia coccinea Cav. | Sacatepéquez, Guatemala | | | Historic | 1917 | COLLECTED | 11/22/1917 | | | 2000 | | | | 1610728 | PI 45578 |
| 44 | PI 44819 | | Dahlia excelsa Benth. | Baja Verapaz, Guatemala | | | Historic | 1917 | COLLECTED | | | | | | | | 1609924 | PI 44819 |
| 45 | PI 44406 | | Dahlia sp. | Alta Verapaz, Guatemala | | | Historic | 1917 | COLLECTED | | | | | | | | 1506720 | PI 44406 |
| 46 | PI 43981 | | Dahlia sp. | Alta Verapaz, Guatemala | | | Historic | 1917 | COLLECTED | | | | | | | | 1506491 | PI 43981 |
| 47 | PI 36257 | | Dahlia sp. | Ciudad de México, Mexico | | | Historic | 1913 | COLLECTED | | | | | | | | 1515889 | PI 36257 |
| 48 | PI 31768 | | Dahlia sp. | Brazil | | | Historic | 1911 | COLLECTED | | | | | | | | 1519832 | PI 31768 |
| 49 | PI 30798 | | Dahlia coccinea Cav. | England, United Kingdom | | | Historic | 1911 | COLLECTED | | | | | | | | 1596579 | PI 30798 |
| 50 | PI 30799 | | Dahlia merckii Lehm. | England, United Kingdom | | | Historic | 1911 | COLLECTED | | | | | | | | 1596581 | PI 30799 |
| 51 | PI 28216 | | Dahlia coccinea Cav. | England, United Kingdom | | | Historic | 1910 | COLLECTED | | | | | | | | 1594053 | PI 28216 |
| 52 | PI 26928 | | Dahlia coccinea Cav. | Jawa, Indonesia | | | Historic | 1910 | COLLECTED | | | | | | | | 1524389 | PI 26928 |
| 53 | PI 24168 | Rose No. 08.314 | Dahlia sp. | Veracruz de Ignacio de la Llave, Mexico | | | Historic | 1908 | COLLECTED | | | | | | | | 1522668 | PI 24168 |
| 54 | PI 24169 | Rose No. 08.315 | Dahlia sp. | Veracruz de Ignacio de la Llave, Mexico | | | Historic | 1908 | COLLECTED | | | | | | | | 1641096 | PI 24169 |
| 55 | PI 23483 | | Dahlia sp. | Thüringen, Germany | | | Historic | 1908 | COLLECTED | | | | | | | | 1522208 | PI 23483 |
| 56 | PI 23321 | Kellerman's 7096 | Dahlia sp. | Guatemala | | | Historic | 1908 | COLLECTED | | | | | | | | 1585261 | PI 23321 |
| 57 | PI 23322 | Kellerman's 7096 | Dahlia sp. | Guatemala | | | Historic | 1908 | COLLECTED | | | | | | | | 1640646 | PI 23322 |
| 58 | PI 21963 | | Dahlia imperialis Roezl ex Ortgies | Guatemala | | | Historic | 1908 | COLLECTED | | | | | | | | 1521473 | PI 21963 |
| 59 | PI 21552 | | Dahlia coccinea Cav. | Ciudad de México, Mexico | | | Historic | 1907 | COLLECTED | | | | | | | | 1533454 | PI 21552 |
| 60 | PI 21553 | | Dahlia coccinea Cav. | Ciudad de México, Mexico | | | Historic | 1907 | COLLECTED | | | | | | | | 1737006 | PI 21553 |
| 61 | PI 21554 | | Dahlia merckii Lehm. | Ciudad de México, Mexico | | | Historic | 1907 | COLLECTED | | | | | | | | 1578964 | PI 21554 |
| 62 | PI 21555 | | Dahlia merckii Lehm. | Ciudad de México, Mexico | | | Historic | 1907 | COLLECTED | | | | | | | | 1737005 | PI 21555 |
| 63 | PI 21556 | | Dahlia pinnata Cav. | Ciudad de México, Mexico | | | Historic | 1907 | COLLECTED | | | | | | | | 1578965 | PI 21556 |
| 64 | PI 21557 | | Dahlia pinnata Cav. | Ciudad de México, Mexico | | | Historic | 1907 | COLLECTED | | | | | | | | 1737007 | PI 21557 |
| 65 | PI 14995 | | Dahlia imperialis Roezl ex Ortgies | Cape Province, South Africa | | | Historic | 1905 | COLLECTED | | | | | | | | 1530694 | PI 14995 |
| 66 | PI 13283 | | Dahlia sp. | Mexico | | | Historic | 1905 | COLLECTED | | | | | | | | 1528999 | PI 13283 |
| 67 | PI 13727 | | Dahlia sp. | Unknown | | | Historic | 1905 | COLLECTED | | | | | | | | 1529337 | PI 13727 |
| 68 | PI 13705 | | Dahlia pinnata Cav. | Massachusetts, United States | | | Historic | 1905 | COLLECTED | | | | | | | | 1572019 | PI 13705 |
| 69 | PI 12738 | | Dahlia merckii Lehm. | Scotland, United Kingdom | | | Historic | 1905 | COLLECTED | | | | | | | | 1526143 | PI 12738 |
| 70 | PI 12565 | | Dahlia sp. | Jalisco, Mexico | | | Historic | 1905 | COLLECTED | | | | | | | | 1526088 | PI 12565 |
| 71 | PI 12564 | | Dahlia sp. | Jalisco, Mexico | | | Historic | 1904 | COLLECTED | | | | | | | | 1526087 | PI 12564 |
| 72 | PI 12449 | White | Dahlia sp. | Guerrero, Mexico | | | Historic | 1904 | COLLECTED | | | | | | | | 1526057 | PI 12449 |
| 73 | PI 12450 | Striped | Dahlia sp. | Jalisco, Mexico | | | Historic | 1904 | COLLECTED | | | | | | | | 1633280 | PI 12450 |
| 74 | PI 12367 | | Dahlia sp. | Guerrero, Mexico | | | Historic | 1904 | COLLECTED | | | | | | | | 1526040 | PI 12367 |
| 75 | PI 10572 | | Dahlia sp. | Guerrero, Mexico | | | Historic | 1904 | COLLECTED | | | | | | | | 1525669 | PI 10572 |
| 76 | PI 10573 | | Dahlia sp. | Guerrero, Mexico | | | Historic | 1904 | COLLECTED | | | | | | | | 1553521 | PI 10573 |
| 77 | PI 9884 | | Dahlia sp. | Jalisco, Mexico | | | Historic | 1903 | COLLECTED | | | | | | | | 1549683 | PI 9884 |
| 78 | PI 7966 | | Dahlia sp. | Mexico | | | Historic | 1901 | COLLECTED | | | | | | | | 1546566 | PI 7966 |
| 79 | PI 7967 | | Dahlia sp. | Mexico | | | Historic | 1901 | COLLECTED | | | | | | | | 1546567 | PI 7967 |
| 80 | PI 7968 | | Dahlia sp. | Mexico | | | Historic | 1901 | COLLECTED | | | | | | | | 1546568 | PI 7968 |
| 81 | PI 7079 | No. 242 | Dahlia sp. | Mexico | | | Historic | 1901 | COLLECTED | | | | | | | | 1544618 | PI 7079 |
| 82 | PI 4475 | 'Dahlia Excelsior Fantasia' | Dahlia pinnata Cav. | Campania, Italy | | | Historic | 1900 | COLLECTED | | | | | | | | 1539785 | PI 4475 |
| 83 | PI 4476 | 'Dahlia Variabilis Imperialis' | Dahlia pinnata Cav. | Campania, Italy | | | Historic | 1900 | COLLECTED | | | | | | | | 1539786 | PI 4476 |
| 84 | MIA 27186 | | Dahlia sp. | | | | Historic | 1981 | DONATED | 02/1981 | | | | | | | 1094326 | MIA 27186 |
| 85 | MIA 26089 | | Dahlia sp. | Mexico | | | Historic | 1980 | COLLECTED | | | | | | | | 1092368 | MIA 26089 |
| 86 | NSL 15448 | W-F DWARF HYBRIDS | Dahlia pinnata Cav. | California, United States | OPGC | | Not Available | 1962 | DONATED | 1962 | | | | | | | 1071667 | NSL 15448 |
| 87 | NSL 15449 | EARLY BIRD SUPER DWARF | Dahlia pinnata Cav. | California, United States | OPGC | | Not Available | 1962 | DONATED | 1962 | | | | | | | 1071670 | NSL 15449 |
| 88 | NSL 15450 | FALL FESTIVAL | Dahlia pinnata Cav. | California, United States | OPGC | | Not Available | 1962 | DONATED | 1962 | | | | | | | 1071677 | NSL 15450 |