Jepson eFlora: Taxon page
Vascular Plants of California
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Ivesia argyrocoma var. argyrocoma

Higher Taxonomy
Family: RosaceaeView DescriptionDichotomous Key
Common Name: ROSE FAMILY
Habit: Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0--3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0--5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5--many, anther pollen sacs generally 2; pistils (0)1--many, simple or compound, ovary superior to inferior, styles 1--5. Fruit: 1--many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1--5 stones. Seed: generally 1--5 (per fruit, not per flower).
Genera In Family: 110 genera, +- 3000 species: worldwide, especially temperate; many cultivated for ornament, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. Note: Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis.
eFlora Treatment Author: Daniel Potter & Barbara Ertter, family description, key to genera, treatment of genera by Daniel Potter, except as noted
Scientific Editor: Daniel Potter, Thomas J. Rosatti.
Genus: IvesiaView DescriptionDichotomous Key

Habit: Perennial herb, glandular; odor resinous. Leaf: generally basal, odd-1-pinnately compound, generally +- cylindric; cauline generally alternate, reduced; leaflets 4--80 per side, generally overlapped, generally divided +- to base. Inflorescence: cyme; pedicel bractlets 0. Flower: receptacle generally not stalked; hypanthium shallow or deep, bractlets (0)5, generally < sepals; petals generally 5, 1--5(7) mm, linear to obovate or round, acute to rounded; stamens 5--20(40), filaments generally thread-like; pistils 1--8(20), ovary superior, style attached below fruit tip, base +- rough-thickened. Fruit: achene.
Species In Genus: 30 species: western North America. Etymology: (Eli Ives, Yale University, Connecticut pharmacologist, 1779--1861) Note: Leaf, leaflet data for basal leaves.
eFlora Treatment Author: Barbara Ertter
Reference: Ertter & Reveal 2007 Novon 17:315--325
Unabridged Reference: Ertter 1989 Syst Bot 14:231--244
Ivesia argyrocoma (Rydb.) Rydb. var. argyrocoma
Habit: Plant rosetted or tufted, silvery-hairy; caudex generally simple. Stem: +- decumbent, 10--20 cm. Leaf: generally 4--8 cm; sheathing bases densely strigose; leaflets 25--35 per side, lobes +- 3, generally 2--3 mm, elliptic to obovate; cauline leaves +- 2. Inflorescence: clusters 1--several, loosely head-like, 10--20 mm wide, < 20-flowered; pedicels < 3 mm (except lowest), +- straight. Flower: +- 10 mm wide; hypanthium length = width; petals 2--4 mm, > sepals, obovate, white; stamens 20, filaments +- flat (unique in Ivesia); pistils 4--8. Fruit: 2--2.5 mm, smooth, brown.
Ecology: Pebble plains; Elevation: 1450--2300 m. Bioregional Distribution: SnBr. Flowering Time: Apr--Jul
Unabridged Note: Ivesia argyrocoma var. moranii Ertter & Reveal (northern Baja California) more compact, with densely hairy stipules, smaller petals.
Jepson eFlora Author: Barbara Ertter
Reference: Ertter & Reveal 2007 Novon 17:315--325
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Listed on CNPS Rare Plant Inventory

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Citation for this treatment: Barbara Ertter 2012, Ivesia argyrocoma var. argyrocoma, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on August 17, 2022.

Citation for the whole project: Jepson Flora Project (eds.) 2022, Jepson eFlora,, accessed on August 17, 2022.

Ivesia argyrocoma var. argyrocoma
click for enlargement
© 2015 Keir Morse
Ivesia argyrocoma var. argyrocoma
click for enlargement
© 2015 Keir Morse
Ivesia argyrocoma var. argyrocoma
click for enlargement
© 2015 Keir Morse
Ivesia argyrocoma var. argyrocoma
click for enlargement
© 2015 Keir Morse
Ivesia argyrocoma var. argyrocoma
click for enlargement
© 2015 Keir Morse
Ivesia argyrocoma var. argyrocoma
click for enlargement
© 2015 Keir Morse

More photos of Ivesia argyrocoma var. argyrocoma in CalPhotos

Geographic subdivisions for Ivesia argyrocoma var. argyrocoma:
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
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).