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Linum perenne L.  
Family: Linaceae
Blue Flax
Linum perenne image
Anthony Mendoza
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Indiana Coefficient of Conservatism: C = null, non-native

Wetland Indicator Status: N/A

The Morton Arboretum
Perennial herb 30 cm - 0.7 m tall Stem: clustered. Leaves: numerous, 1 - 3 cm long, linear, single-veined or somewhat three-veined at base. Flowers: scattered in leafy terminal inflorescences, with five blue petals 1 - 2.3 cm long. The five sepals are 5 - 7 mm long, egg-shaped with a blunt or short abrupt tip (mucronate), and toothless. Fruit: a capsule, 5 - 9 mm across, egg-shaped to nearly spherical, slightly beaked, soon splitting into ten segments with pointed tips.

Similar species: Linum perrenne and Linum usitatissimum both have blue petals and wider fruit (5 - 10 mm) than the other Linum species in our region. Linum usitatissumum is distinguished by its annual life cycle, single stem, sepals with long pointed tips, toothed inner sepals with fringed hairs along the margin, and leaves with three veins.

Flowering: May

Habitat and ecology: Introduced from Europe, this species is found in sandy soil along roadsides.

Occurence in the Chicago region: non-native

Etymology: Linum is the Latin name for flax. Perenne means perennial.

Author: The Morton Arboretum

Vascular plants of NE US and adjacent Canada
Perennial, 3-7 dm, the stems mostly clustered; lvs erect, very numerous, linear, 1-3 cm, 1-nerved, or obscurely 3-nerved at base; fls heterostylic; sep ovate, 5-7 mm, obtuse and minutely mucronate, entire; pet blue, 12-23 mm; staminodes subulate or tooth-like, 1 mm; stigmas ellipsoid-capitate; fr 5-9 mm, ovoid-globose, scarcely beaked, the 10 segments acute or shortly acuminate; false septa incomplete, long-ciliate; 2n=18. Native of Europe, occasionally intr. in disturbed habitats in our range, as in Wis. and Mich., where it has been mistaken for the closely allied homostylic cordilleran sp. L. lewisii Pursh. May-July.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Linum perenne
Open Interactive Map
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Anthony Mendoza
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Anthony Mendoza
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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