Montanum Characteristics stems and leaves mostly 1-3 mm wide; not under 1 mm wide perianth segments somewhat emarginate or abruptly narrowed to an aristulate apex (awn or bristle)

 

Sisyrinchium Characteristics 2-edged stems flowers small, regular or nearly so

Iridaceae Characteristics plants with stem and leaves, not thallus-like flowers borne in a spathe perianth present, in two series of 3 segments each perianth conspicuous, at least the inner whorl brightly coloured sepals and petals usually alike flowers regular petals not deciduous petals variously coloured ovary inferior 3 carpels, their ovaries united