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]



Stem 5–50 cm
Leaves generally alternate, generally thread-like to linear, generally flat, generally not clasping
Inflorescence: cyme, generally open; pedicels thread-like, generally ascending to erect
Flower: sepals 5, glabrous, hairy, or margins minutely gland-toothed; petals 5, generally widely spreading, 1–12 mm, yellow or white to rose, each with 3 small scales at inner base; stamens 5; staminodes 0; ovary chambers 4 or 6, styles 2–3, stigmas ± = styles in width
Fruit: surface smooth
Species in genus: 13 species: especially CA; mostly localized, mostly on serpentine
Etymology: (Greek & Latin: western flax)
Reference: [Sharsmith 1961 Univ Calif Publ Bot 32:235–314]
Generally self-pollinated. Segregated from Linum.


H. breweri (A. Gray) Small


Plant 5–20 cm, ± glabrous
Leaves alternate, linear
Inflorescence short, dense; pedicels generally < 3 mm
Flower: sepals 3–4 mm, margins gland-toothed; petals 4–10 mm, yellow; stamens 5.5–10 mm, anthers yellow; ovary chambers 6, styles 3, 3–8 mm, yellow
Chromosomes: n=18
Ecology: Chaparral or grassland, sometimes on serpentine
Elevation: 30–700 m.
Bioregional distribution: s Inner North Coast Ranges (Napa, Solano cos.), ne San Francisco Bay Area (Mount Diablo area, Contra Costa Co.).
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for HESPEROLINON%20breweri 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 Hesperolinon breweri
Retrieve dichotomous key for Hesperolinon
Retrieve multiple-entry key (MEKA) for Hesperolinon
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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