Sisyrinchium L. >
Perianth yellow or rarely blue Sisyrinchium
Perennial or annual with compressed or winged stems, up to 35 cm high. Perianth 10–20 mm diam., yellow or blue to purple. Capsule c. 6 mm diam. Sporadic in a variety of habitats. Introd. from America. Fl. spring–summer. Blue Pigroot Sisyrinchium iridifolium