Hyacinthoides hispanica (Mill.) Rothm. (syn.: Endymion hispanicus (Mill.) Chouard, Scilla hispanica Mill., S. non-scripta (L.) Hoffmanns. et Link subsp. hispanica (Mill.) Ietswaart, Hyacinthoides non-scripta subsp. \
hispanica (Mill.) Kerguélen) (SW-Eur., N-Afr.) – A locally naturalized garden escape. Surely over-recorded for the often exceedingly similar H. xmassartiana (see there). As a result of introgression Hyacinthoides hispanica may possibly disappear in favor of the latter in its Belgian locations.
Many diacritic features for their distinction (width of leaves, length of tepals,…) are variable and therefore unreliable. The characters provided in the key appear to be (more or less) unequivocal but are only useful in the field.
The specific status of Hyacinthoides hispanica is still controversial (Grundman & al. 2010). It has been combined under Hyacinthoides non-scripta in the past (see synonyms). Especially the ease with which introgressive hybridization between these two species occurs, suggests a very close relationship. According to Grundman & al. (2010) British (triploid) populations of Hyacinthoides hispanica do not correspond with autochthonous (diploid) material from southwestern Europe.
The exact origin of these vigorous plants and their taxonomic position compared to genuine Hyacinthoides hispanica needs further study.