Jepson eFlora: Taxon page
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Sclerolinon digynum

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: SclerolinonView Description 

Species In Genus: 1 sp. Etymology: (Greek, Latin: hard flax, for hard, generally indehiscent fruit) Note: Closely related to Hesperolinon.

Sclerolinon digynum (A. Gray) C.M. Rogers
Habit: Annual. Stem: erect, glabrous. Leaf: opposite, 5--16 mm, oblong to elliptic, proximal generally entire, distal generally serrate; stipule glands 0. Inflorescence: cyme; bracts generally serrate. Flower: sepals unequal, margins gland-toothed; petals 5, yellow, appendages 0; staminodes 0; carpels 2, ovary chambers 4, styles 2, free, +- 1 mm; stigma > style in width, head-like. Fruit: capsule surface rough; indehiscent or breaking into 4 closed, 1-seeded segments in age. Seed: +- 1 mm, +- 3-sided in ×-section, tip acute.
Ecology: Generally vernally moist meadows; Elevation: 1000--1800 m. Bioregional Distribution: KR, CaR, SN; Distribution Outside California: to Washington, Idaho. Flowering Time: Jun--Aug
eFlora Treatment Author: Joshua R. McDill
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botanical illustration including Sclerolinon digynum


Citation for this treatment: Joshua R. McDill 2016. Sclerolinon digynum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 30, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 30, 2016.

Sclerolinon digynum
click for enlargement
© 2010 Barry Breckling
Sclerolinon digynum
click for enlargement
© 2009 Barry Breckling

More photos of Sclerolinon digynum in CalPhotos

Geographic subdivisions for Sclerolinon digynum:
KR, CaR, SN;
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.
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.