It is unique form at present regarded as stoloniferous form of C. salzmannii. By this it resembles C. nudiflorus but contrary to last develop leaves together with flowers. Recently HKEP published review of "serotinus" group crocuses and they regards as typical salzmannii plants growing in Marocco, but Spanish forms could belong to different species. At least this one. In nature it growth in peaty pockets, so prefair acid soils, but is quite tolerant in this aspect.