Appearance''Sisyrinchium montanum'' is a herbaceous perennial plant that grows in clumps between 10–50 cm tall. Its stems have wings with entire to finely toothed margins. The leaves and stem are slender, 3 mm broad, green or brownish, with sharp edges and a fine point.
The flowers are produced in a small cyme of two to five together emerging from a spathe, each flower about 2 cm diameter, with six purplish tepals with a yellowish base and yellow stamens. The fruit is a capsule 4.5–6 mm long, containing numerous small black seeds.
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