Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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LINACEAE

FLAX FAMILY

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]

LINUM

FLAX

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)

Native

L. puberulum (Engelm.) A. Heller

Perennial
Stem puberulent
Leaf 5–10 mm, linear; margin gland-toothed
Inflorescence: bract margins gland-toothed
Flower: sepals 4–7 mm, < or = fruit, lanceolate, margins gland-toothed; petals 10–15 mm, yellow to orange; styles fused to near tip
Fruit 3.5–4 mm
Seed ± 2.5 mm
Chromosomes: n=15
Ecology: Dry ridges
Elevation: 1000–2500 m.
Bioregional distribution: e Desert Mountains
Distribution outside California: to Colorado, Texas
Flowering time: May–Jul
Horticultural information: TRY.

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