Jepson eFlora: Taxon page
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Hesperolinon didymocarpum
LAKE COUNTY WESTERN FLAX

Higher Taxonomy
Family: LinaceaeView DescriptionDichotomous Key

Common Name: FLAX FAMILY
Habit: 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.
Genera In Family: 13 genera, +- 250 species: cosmopolitan, most temperate, some cultivated. Note: Hesperolinon, Sclerolinon are evolutionary lineages within Linum.
eFlora Treatment Author: Joshua R. McDill
Scientific Editor: Douglas H. Goldman, Robert Patterson, Bruce G. Baldwin.
Genus: HesperolinonView DescriptionDichotomous Key

Common Name: WESTERN FLAX
Habit: 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.
Species In Genus: 12--13 species: especially California, often on serpentine. Etymology: (Greek, Latin: western flax) Note: Hesperolinon serpentinum, used in TJM (1993), is not validly published.

Hesperolinon didymocarpum H. Sharsm.
NATIVE
Habit: Plant 10--30 cm, glabrous except just distal to nodes. Leaf: alternate, 10--25 mm, thread-like to linear, flat, not clasping. Inflorescence: +- equally forked; pedicels 2--12 mm. Flower: sepals 2--3 mm; petals 2.5--4 mm, white or light pink; stamens 3.5--5 mm, anthers white to +- purple; ovary chambers 4, styles 2, 2.5--4 mm, white. Chromosomes: n=17.
Ecology: Serpentine, chaparral, grassland; Elevation: 100--200 m. Bioregional Distribution: NCoRI (Big Canyon Creek, Lake Co.). Flowering Time: May--Jun Note: Like Hesperolinon bicarpellatum except flower color.
eFlora Treatment Author: Joshua R. McDill
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

Previous taxon: Hesperolinon congestum
Next taxon: Hesperolinon disjunctum

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botanical illustration including Hesperolinon didymocarpum

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Citation for this treatment: Joshua R. McDill 2016. Hesperolinon didymocarpum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=28042, accessed on February 10, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 10, 2016.


Geographic subdivisions for Hesperolinon didymocarpum:
NCoRI (Big Canyon Creek, Lake Co.).
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.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.