prairie blue-eyed grass

(Sisyrinchium campestre)

Conservation Status
prairie blue-eyed grass
  IUCN Red List

not listed


N5? - Secure

SNR - Unranked


not listed


Prairie blue-eyed grass is an erect, 4 to 16 tall, perennial forb that rises in a tuft of 2 to 6 basal leaves and one or more flowering stalks from coarse, fibrous roots.

The basal leaves are pale green, linear, flat, 3 to 10 long, and 1 32 to wide. They are sharply pointed at the tip and are usually hairless.

The stem is light green to olive green and may be slightly covered with a whitish waxy substance (glaucous). It is unbranched, distinctly winged, and no more than wide.

The inflorescence is a solitary flower or a single, unstalked, flattened, fan-shaped cluster (cyme) of 2 to 11 flowers at the end of the stem. The cyme is subtended and partially enclosed by a pair of claw-like bracts (spathe). There is no leaf-like bract below the spathe.

The spathe is ½ to 2 3 16 long, green, and not at all or only slightly tinged purple. The outer bract is 1½ to 2 times longer than the inner bract. The margins are thin, membranous, and translucent or transparent. The margin of the outer bract is distinct all the way to the base.

The flowers are ½ to 1 wide. They are borne on thin, thread-like stalks that are about as long as the spathes. They are drooping when in bud, becoming erect when in flower. Each flower has 3 petals, 3 petal-like sepals (6 tepals), 3 stamens, and 3 styles. The tepals are spreading, inversely lance-shaped, and ¼ to ½ long. They are rounded to notched at the tip with a bristle-like extension at the tip. They are usually pale violet or light blue, sometimes white, and they are yellow at the base. The stamens have white filaments and yellow anthers. The filaments are fused for most of their length around the styles. The styles extend beyond the anthers.

The fruit is an egg-shaped, to 3 16 long, light to dark brown capsule with many seeds.




4 to 16


Flower Color


Pale violet, light blue, or white


Similar Species


Mountain blue-eyed grass (Sisyrinchium montanum var. montanum) spathe is often strongly tinged purple. The margins of the outer spathe bract are fused for 1 32 to ¼ at the base. The flowers are bluish-violet.

Narrow-leaved blue-eyed-grass (Sisyrinchium angustifolium) leaves and stems are not glaucous. There may be 2 to 4 stalked flower clusters on the stem, causing the stem to appear branched.






May to July


Pests and Diseases






Distribution Map



2, 3, 4, 5, 7, 24, 28, 30.









  Kingdom Plantae (green algae and land plants)  
  Subkingdom Viridiplantae (green plants)  
  Infrakingdom Streptophyta (land plants and green algae)  
  Superdivision Embryophyta (land plants)  
  Division Tracheophyta (vascular plants)  
  Subdivision Spermatophytina (seed plants)  
  Class Liliopsida (monocots)  


Asparagales (agaves, orchids, irises, and allies)  


Iridaceae (irises and allies)  
  Subfamily Iridoideae  
  Tribe Sisyrinchieae  


Sisyrinchium (blue-eyed grasses)  



Sisyrinchium campestre var. kansanum

Sisyrinchium flaviflorum

Sisyrinchium kansanum


Common Names


prairie blue-eyed grass










A branched, flat-topped or convex flower cluster in which the terminal flower opens first and the outermost flowers open last.



On plants: The thread-like stalk of a stamen which supports the anther. On Lepidoptera: One of a pair of long, thin, fleshy extensions extending from the thorax, and sometimes also from the abdomen, of a caterpillar.



Pale green or bluish gray due to a whitish, powdery or waxy film, as on a plum or a grape.



Long, straight, and narrow, with more or less parallel sides, like a blade of grass.



One or two large bracts that subtend, hood, or sometimes envelope a flower or flower cluster, as with a Jack-in-the-Pulpit.



Refers to both the petals and the sepals of a flower when they are similar in appearance and difficult to tell apart. Tepals are common in lilies and tulips.



A thin, flat, membranous, usually transparent appendage on the margin of a structure.



















What’s in a Name?

Contrary to its common name, prairie blue-eyed grass is an iris, not a grass.

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Nancy Falkum

    prairie blue-eyed grass   prairie blue-eyed grass  

Blue-Eye Grass

    prairie blue-eyed grass   prairie blue-eyed grass  
    prairie blue-eyed grass   prairie blue-eyed grass  

Bill Reynolds

    prairie blue-eyed grass      


    prairie blue-eyed grass      


    prairie blue-eyed grass   prairie blue-eyed grass  


    prairie blue-eyed grass      






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  Nancy Falkum

Location: Kellogg Weaver Dunes SNA, Weaver Dunes Unit

prairie blue-eyed grass  
  Nancy Falkum

Location: Kellogg Weaver Dunes SNA, Weaver Dunes Unit

prairie blue-eyed grass  
  Nancy Falkum

Location: Kellogg Weaver Dunes SNA, Weaver Dunes Unit

Blue-Eye Grass

prairie blue-eyed grass  
  Bill Reynolds

Location: Pennington County

prairie blue-eyed grass  




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