Vascular Plants of North Carolina
Account for Annual Blue-eyed-grass - Sisyrinchium rosulatum   Bicknell
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Section 5 » Order Liliales » Family Iridaceae
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AuthorBicknell
DistributionFound over the southeastern Coastal Plain, west to include the Sandhills and the southern Piedmont. Only a few records from the northern Coastal Plain and northern Piedmont. Many records (especially inland ones) have come since the 1990s, indicating recent spread. Somewhere in the Piedmont, the website editors must consider records as being of uncertain provenance, as this is a very weedy species.

This is a Southern species ranging barely north to southeastern VA, and south to southern FL and eastern TX.
AbundanceFairly common to locally common in the lower Coastal Plain from Currituck County to the SC border. Uncommon to locally fairly common in the southwestern Coastal Plain (including the Sandhills). Very rare in the Piedmont and northern Coastal Plain, but slowly increasing and spreading. Though recorded from perhaps barely 1/3 of the state's 100 counties, its weediness and spread suggest that it should be re-ranked as S5 instead of S4.
HabitatThis is the only native blue-eyed-grass that appears weedy and "exotic". It grows in lawns, vacant lots, roadsides, various sandy or mesic places in pine woods, and other sunny places often disturbed by man.
PhenologyBlooms in April and May, and fruits in May and June.
IdentificationThis is an odd Sisyrichium that differs quite a bit from all others in the state. The flowers tend to be white, pink, or very pale blue, a different color than most others. The 6 tepals tend to be triangular in shape rather than more rounded or parallel-sided in other species, giving the flower a more star-like shape. Most significantly, the tepals have a dark red to purple blaze mark at the base of each one; no other NC Sisyrinchium has any dark red on the tepals. This is an annual plant and can grow quickly. The stems often lean or grow at an angle or even prostrate, instead of straight up, and generally grows to only 6-8 inches tall. It has a cluster of narrow yet "wide" basal leaves, not as needle-like as many species. People who have spent much time toward the southern coast would have seen a weedy, pale-flowered blue-eyed-grass, with a dark center to the flower, and assumed it was a non-native species. A few websites do treat it as such, but most references consider it as a native species.
Taxonomic CommentsNone, other than it is considered by Weakley (2018) and most references as a native species despite its weediness.

Other Common Name(s)Lawn Blue-eyed-grass, Fairy-stars
State RankS4 [S5]
Global RankG5
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