Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Niall F. McCarten

Annual, perennial herb, shrub
Stem generally erect, branched, glabrous, hairy, or glandular
Leaves generally cauline, alternate, opposite, or whorled, simple, sessile, generally linear to ovate; stipules glandular or 0
Inflorescence: raceme or cyme, axillary, open to dense
Flower generally bisexual, radial, nodding in bud; sepals 4–5, free, glabrous, hairy, or margins gland-toothed; petals 4–5, free, blue, white, yellow, or pink, ephemeral; stamens 4–5, alternate petals, generally appendaged; staminodes alternate stamens or 0; ovary superior, chambers 2–5 but becoming 4–10 by growth of false septa, styles 2–5
Fruit: generally capsule
Genera in family: 13 genera, 300 species: worldwide, especially temp; some cultivated (Linum usitatissimum , flax, linseed; L. bienne, L. grandiflorum , ornamental)
Reference: [Robertson 1971 J Arnold Arbor 52: 649–665]



Annual, perennial herb
Stem 5–90 cm
Leaves alternate, opposite, or whorled, erect, glabrous or hairy; margins entire or gland-toothed
Inflorescence: raceme or cyme
Flower: sepals 5, margins generally translucent; petals 5, 8–25 mm; stamens 5; staminodes 5 or 0; ovary chambers 10, styles 5, free or not, stigmas > styles in width (spheric or ± elongate) or = styles in width (± linear)
Fruit 5–10 mm
Seeds 10, generally gelatinous when wet
Species in genus: ± 200 species: temp & subtropical, especially Medit. Linum usitatissimum has been reported from D as a garden escape
Etymology: (Latin: flax)


L. lewisii Pursh

Stem glabrous
Leaf 10–20 mm, linear to lanceolate, glabrous
Inflorescence: pedicels 10–30 mm
Flower: sepals 4–6 mm, ovate; petals 6–15 mm, blue, sometimes white; styles free, stigmas ± spheric
Fruit 5–8 mm
Seed 3.5–4.5 mm
Ecology: Dry open ridges, slopes
Elevation: 400–3000 m.
Bioregional distribution: California Floristic Province, n East of Sierra Nevada, White and Inyo Mountains, Desert
Distribution outside California: to Alaska, Rocky Mtns, Texas, Mexico

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bioregional map for LINUM%20lewisii being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Linum lewisii
Retrieve dichotomous key for Linum
Overlay Consortium of California Herbaria specimen data by county on this map
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