Table 1. Introduction vectors gleaned from historical sources.
The vectors stated or implied from specimens and publications, including the range of dates that vectors were mentioned either on specimens or in publications.
| Vector | Dates | Number | Example references and specimens |
|---|---|---|---|
| Ballast | 1870–1912 | 13 | Publications: Burk, 1877; Mohr, 1901; Hjelt, 1906; Specimens: BIRM 032912; MANCH.94943.Kk803; S-H-2810 |
| Grain | 1936–1964 | 3 |
Uotila, 2001; Unaccessioned specimens from National Herbarium Nederland (L) |
| Wool | 1909 | 1 | Observation by IM Hayward, Selkirkshire in database of the Botanical Society of Britain and Ireland (2013) |
| Ore | 1931–1961 | 4 |
Uotila, 2001; Reed, 1964; Lazkov, Sennikov & Naumenko, 2014; Specimen S-H-2141 |
| Cork | 1956–1966 | 1 | Uotila, 2001 |
| Horticultural imports | 2008 | 1 | Hoste et al., 2009 |