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Vascular Plants of California
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Eriastrum calocyanum

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 W. Patterson, family description, key to genera, except as noted
Scientific Editor: Robert W. Patterson, Thomas J. Rosatti.
Genus: EriastrumView DescriptionDichotomous Key

Common Name: WOOLLY-STAR
Habit: Annual, perennial, or subshrub; often woolly, glandular or not. Stem: generally erect, branching from base or above, sometimes unbranched. Leaf: cauline, alternate, entire to pinnately lobed; lobes generally linear or lanceolate. Inflorescence: terminal, head-like or flower occasionally 1, bracted, lightly to densely woolly; bracts leaf-like; flowers sessile or subsessile. Flower: calyx lobes equal to unequal, lightly to densely woolly, sometimes glandular-puberulent; corolla funnel-shaped to salverform, radial or bilateral, white or blue to purple or yellow; stamens fused to corolla at base, equal or unequal, anthers sagittate, pollen white to blue; ovary 3-chambered, style included or exserted, stigma 3-lobed. Fruit: capsule loculicidal. Seed: 1--11 per chamber.
Etymology: (Greek: woolly star)
eFlora Treatment Author: Sarah J. De Groot
Reference: De Groot 2016 Aliso 34(2):25--152.
Eriastrum calocyanum De Groot
Habit: Annual, 4--25(37) cm. Stem: erect, sometimes branched above or from base, often zig-zag, woolly. Leaf: 7--35 mm, woolly, entire to 4-lobed, lobes linear to thread-like. Inflorescence: generally terminal, occasionally axillary, (1)3--8(17)-flowered, woolly. Flower: calyx 5.3--8 mm, densely woolly, lobes unequal to subequal; corolla 7--10.1 mm, radial, +- salverform, throat often noticeably flared, wider than tube, tube 3.8--5.3 mm, generally white to cream or yellow, throat 1--2 mm, white to yellow, tube plus throat 5--7 mm, generally slightly < calyx, lobes 2.3--4.2 mm, light blue or lavender to deep royal blue, often with a dark reddish or purplish spot at base; stamens exserted <= 2.3 mm beyond corolla sinus, attached 0.9--1.5 mm below sinus, free portion +- 1.5--3.5 mm, equal to unequal, anthers 0.75--1 mm; pistil 5--8.3 mm, exceeding anthers or not. Fruit: capsule +- 3--4 mm, oblong-ellipsoid, seed 1 per chamber. Seed: 2--2.5 mm, tan.
Ecology: Open benches along creeks, chaparral, mixed woodland; Elevation: 400--1300 m. Bioregional Distribution: SCoR, w SnJV. Flowering Time: May--Jun
Synonyms: Eriastrum wilcoxii, misapplied.
Jepson eFlora Author: Sarah J. De Groot
Reference: De Groot 2016 Aliso 34(2):25--152.
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Citation for this treatment: Sarah J. De Groot 2023, Eriastrum calocyanum, in Jepson Flora Project (eds.) Jepson eFlora, Revision 12,, accessed on February 24, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on February 24, 2024.

Eriastrum calocyanum
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©2018 Ryan O'Dell
Eriastrum calocyanum
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©2018 Ryan O'Dell
Eriastrum calocyanum
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©2018 Ryan O'Dell
Eriastrum calocyanum
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©2021 Ryan O'Dell
Eriastrum calocyanum
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©2021 Ryan O'Dell

More photos of Eriastrum calocyanum
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Geographic subdivisions for Eriastrum calocyanum:
SCoR, w SnJV.
1. You can change the display of the base map layer control box in the upper right-hand corner.
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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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).