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Vascular Plants of California
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Eriastrum rosamondense
ROSAMOND WOOLLY-STAR, ROSAMOND ERIASTRUM


Higher Taxonomy
Family: PolemoniaceaeView DescriptionDichotomous Key
Common Name: PHLOX FAMILY
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 rosamondense D. Gowen
NATIVE
Habit: Annual, 2--11 cm. Stem: erect, unbranched or branched above, occasionally branched from base, lightly woolly to subglabrous. Leaf: 4--13(15) mm, widely-linear, primary axis +- 1 mm wide, subglabrous, lower leaves entire, upper leaves entire to 3-lobed. Inflorescence: heads terminal, woolly, 1--10-flowered; outer bracts entire to 3-lobed, inner bracts 3-lobed. Flower: calyx 4.5--6 mm, woolly, lobes unequal; corolla 4.4--5.9(7) mm, narrowly funnel-shaped, sometimes persistent, only corolla lobes exserted beyond calyx, sometimes barely, tube 2.5--3.3 mm, slightly > 1/2 corolla length, white, throat 0.2--0.8 mm, white to cream, tube + throat 2.9--4.1 mm, lobes 1.3--2(2.5) mm, +- 1/3 corolla length, white to pale blue, sometimes translucent, midvein sometimes darker; stamens exserted 0.4--1 mm beyond corolla sinus, 0.6--1.1 mm < corolla lobes, attached 0.4--1.0 mm below sinuses, free portion 1.25--2.1(2.5) mm, mostly equal to slightly unequal, anthers (0.25)0.5--0.75 mm; pistil 3.8--5.6 mm, 0.2 mm < stamens to 1 mm longer, ovules 1--4 per ovary chamber, 4--11 ovules total. Fruit: capsule +- 3--4.3 mm, reddish-tipped when immature, seeds 1--4 per chamber. Seed: +- 1.0--1.4 mm, tan, angular.
Ecology: Flat alkali plains, especially hard-packed sandy cryptogamic soil among low hummocks with dry pools, alkaline scrub; Elevation: 700--730 m. Bioregional Distribution: w DMoj (Rosamond Dry Lake area). Flowering Time: Apr--May Note: Previously included in Eriastrum hooveri.
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)
Listed on CNPS Rare Plant Inventory

Previous taxon: Eriastrum pluriflorum subsp. sherman-hoytae
Next taxon: Eriastrum sapphirinum

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Citation for this treatment: Sarah J. De Groot 2023, Eriastrum rosamondense, in Jepson Flora Project (eds.) Jepson eFlora, Revision 12, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=99215, accessed on April 19, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 19, 2024.

Eriastrum rosamondense
click for enlargement
©2020 Steve Matson
Eriastrum rosamondense
click for enlargement
©2020 Steve Matson
Eriastrum rosamondense
click for enlargement
©2020 Steve Matson
Eriastrum rosamondense
click for enlargement
©2020 Steve Matson
Eriastrum rosamondense
click for enlargement
©2020 Steve Matson

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Geographic subdivisions for Eriastrum rosamondense:
w DMoj (Rosamond Dry Lake area).
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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.
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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.
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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).