Jepson Herbarium
		University of California, Berkeley

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Indexes to all accepted names and synonyms: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

Annual, perennial herb [ shrub, tree, vine].
Stem: generally erect [climbing], branched, glabrous to hairy.
Leaf: cauline, alternate to opposite or whorled, simple, generally sessile, linear to obovate, entire to minutely toothed or ciliate, teeth occasionally gland-tipped; stipules small, dark-colored, spheric glands, or 0.
Inflorescence: raceme, panicle, or cyme [ spike].
Flower: bisexual, radial; sepals [4]5, free; petals = sepals in number, free to adherent; stamens 5[4 or 10], alternate petals, filaments fused basally into a cup-like structure surrounding ovary base; staminodes present, alt stamens at cup rim, or 0; ovary superior, carpels 2–5, fused, styles 2–5, = carpel number, free or partly fused.
Fruit: capsule, generally dehiscent [ drupe in some tropical species], generally 10-seeded.
13 genera, ± 250 species: cosmopolitan, most temperate, some cultivated. [McDill et al. 2009 Syst Bot 34:386–405] Hesperolinon, Sclerolinon are evolutionary lineages within Linum. —Scientific Editors: Douglas H. Goldman, Robert Patterson, Bruce G. Baldwin.
Unabridged references: [Robertson 1971 J Arnold Arbor 52:649–665]

Key to Linaceae

Annual, erect, 3–50 cm, generally branched (at least in inflorescence).
Leaf: generally alternate (occasionally opposite or whorled), generally sessile, 4–35 mm, 1–3(6) mm wide, thread-like or linear to ovate or obovate, margin gland-toothed or entire; stipular glands present or 0.
Inflorescence: generally open or dense cyme, bracted; pedicel thread-like, generally ascending to erect.
Flower: sepals lanceolate to ovate, acute or acuminate, glabrous or hairy, or margins glandular- ciliate; petals free, 1–12 mm, yellow, white, or pink, generally with small appendages near base; staminodes 0; carpels 2–3, stigmas linear (± = style in width).
Fruit: smooth.
Seed: ± triangular in ×-section, acute.
12–13 species: especially CA, often on serpentine. (Greek, Latin: western flax) [Sharsmith 1961 Univ Calif Publ Bot 32:235–314] Hesperolinon serpentinum, used in TJM (1993), is not validly published.

Plant 10–50 cm.
Leaf: opposite or whorled proximally, lanceolate, keeled, clasping, margins with stalked, gland-tipped teeth in 1–3 rows.
Inflorescence: bract margins with stalked, gland-tipped teeth in 1–3 rows; pedicels generally 5–15 mm.
Flower: sepals 2–3 mm; petals 3–5 mm, yellow, often veined or tinged orange, fading white; stamens 4–5.5 mm, anthers yellow; ovary chambers 6, styles 3, 2.5–4 mm, yellow.
Serpentine, chaparral; 150–1000 m. n&c North Coast Ranges (especially Lake, Mendocino cos.).

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Next taxon: Hesperolinon bicarpellatum

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].

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Bioregions in which taxon occurs	Red area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon; markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
Chart based on elevation range in Manual and elevations and coordinates of CCH records. Data provided by the participants of the Consortium of California Herbaria. Note: About half of the CCH records include both elevation and coordinates.	Map made in collaboration with Scott Loarie. Data provided by the participants of the Consortium of California Herbaria. View all CCH records   CCH collections by month Duplicates counted once; synonyms included. Species do not include records of infraspecific taxa. Blue line denotes Manual flowering time.