Jepson eFlora: Taxon page
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Eriastrum densifolium subsp. sanctorum

Higher Taxonomy
Family: PolemoniaceaeView DescriptionDichotomous Key

Habit: Annual, perennial herb, shrub, vine. Leaf: simple or compound, cauline (or most basal), alternate or opposite; stipules 0. Inflorescence: cymes, heads, clusters, or flower 1; bracts in involucres or not. Flower: sepals generally 5, fused at base, translucent membrane generally connecting lobes, torn by fruit; corolla generally 5-lobed, radial or bilateral, salverform to bell-shaped, throat often well defined; stamens generally 5, epipetalous, attached at >= 1 level, filaments of >= 1 length, pollen white, yellow, blue, or red; ovary superior, chambers generally 3, style 1, stigmas generally 3. Fruit: capsule. Seed: 1--many, when wetted swelling or not, gelatinous or not.
Genera In Family: 26 genera, 314 species: America, northern Europe, northern Asia; some cultivated (Cantua, Cobaea (cup-and-saucer vine), Collomia, Gilia, Ipomopsis, Linanthus, Phlox). Note: Leptodactylon moved to Linanthus.
eFlora Treatment Author: Robert Patterson, family description, key to genera
Scientific Editor: Robert Patterson, Thomas J. Rosatti.
Genus: EriastrumView DescriptionDichotomous Key

Habit: Glabrous to woolly, glandular or not. Stem: generally erect. Leaf: cauline, alternate, generally pinnate-lobed or simple; lobes generally linear or lanceolate. Inflorescence: head-like, bracted, generally densely woolly; bracts leaf-like; flowers sessile. Flower: calyx lobes unequal, generally woolly; corolla radial or bilateral, funnel-shaped to salverform; stamens equal or not, anthers generally sagittate, pollen white or blue; style included or exserted. Seed: 1--several per chamber.
Species In Genus: 18 species: western North America. Etymology: (Greek: woolly star) Note: Eriastrum ertterae, Eriastrum rosamondense described since TJM2 (Gowen 2013 J Bot Res Inst Texas 7: 21--24). Apparently more undescribed variation; genus being revised.
eFlora Treatment Author: Sarah De Groot, David Gowen & Robert Patterson
Species: Eriastrum densifoliumView Description 

Habit: Perennial herb from woody caudex. Stem: erect or spreading, +- glabrous to woolly. Leaf: 10--50 mm; lobes 0--15, glabrous to woolly. Flower: corolla 16--37 mm, funnel-shaped, blue, lavender, or white, lobes 5--12 mm; stamens attached in sinus or upper throat, equal, exserted. Chromosomes: 2n=14.

Eriastrum densifolium subsp. sanctorum (Milliken) H. Mason
Leaf: lobes generally 2--6, woolly, occasionally densely so. Inflorescence: heads terminal or upper branches +- raceme-like. Flower: corolla 25--37 mm, lavender-blue, veins occasionally darker, tube + throat to 25 mm, yellow, +- puberulent, lobes 8--12 mm; stamens 6.5--8 mm. Seed: +- 5 per chamber.
Ecology: Washes, floodplains, dry riverbeds; Elevation: < 500 m. Bioregional Distribution: e SCo (Santa Ana River drainage, sw San Bernardino Co.). Flowering Time: May--Sep Note: Threatened by habitat alteration.
eFlora Treatment Author: Sarah De Groot, David Gowen & Robert Patterson
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

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Next taxon: Eriastrum diffusum

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botanical illustration including Eriastrum densifolium subsp. sanctorum


Citation for this treatment: Sarah De Groot, David Gowen & Robert Patterson 2016. Eriastrum densifolium subsp. sanctorum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 02, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 02, 2016.

Eriastrum densifolium subsp. sanctorum
click for enlargement
© 2009 Thomas Stoughton
Eriastrum densifolium subsp. sanctorum
click for enlargement
© 2009 Thomas Stoughton
Eriastrum densifolium subsp. sanctorum
click for enlargement
© 2009 Thomas Stoughton

More photos of Eriastrum densifolium subsp. sanctorum in CalPhotos

Geographic subdivisions for Eriastrum densifolium subsp. sanctorum:
e SCo (Santa Ana River drainage, sw San Bernardino 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.
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.