Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Annual to tree
Leaves simple to pinnately to palmately compound, generally alternate; stipules free to fused, persistent to deciduous
Inflorescence: cyme, raceme, panicle, or flowers solitary
Flower generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, often with bractlets alternate with sepals; sepals generally 5; petals generally 5, free; stamens (0)5–many, pistils (0)1–many, simple or compound; ovary superior to inferior, styles 1–5
Fruit: achene, follicle, drupe, pome, or blackberry- to raspberry-like
Seeds generally 1–5
Genera in family: 110 genera, ± 3000 species: worldwide, especially temp. Many cultivated for ornamental and fruit, especially Cotoneaster , Fragaria , Malus , Prunus , Pyracantha, Rosa , and Rubus
Reference: [Robertson 1974 J Arnold Arbor 55:303–332,344–401,611–662]
Family description, key to genera by Barbara Ertter and Dieter H. Wilken.



Barbara Ertter

Annual to shrub; odor resinous or 0
Leaves generally basal, odd-1-pinnate to 1-palmate or 1-ternate; leaflets ± toothed or lobed, terminal generally ± = lateral
Inflorescence: cyme, generally ± open; pedicels generally ± straight
Flower: hypanthium ± shallow; bractlets 5; sepals generally 5, ± triangular; petals generally 5, generally = or > sepals, generally ± widely obcordate, generally yellow; stamens generally 20; pistils generally many, styles generally jointed near tip
Fruit: achene
Species in genus: 200–500 species: n temp
Etymology: (Latin: diminutive of powerful, for reputed medicinal value)
Reference: [Clausen, Keck, & Hiesey 1940 Carn Inst Wash Pub 520:26–195]
P. anglica Laicharding is a waif from cultivated: stem trailing; pedicels 2–8 cm, slender; sepals and petals generally 4; leaflets 3–5.


P. glandulosa Lindl.

Plant generally ± tufted from loosely branched caudex; glandular hairs often many
Stem ± erect, 5–90 cm, spreading-hairy
Leaves pinnate; basal 3–30 cm, terminal leaflet largest (0.5–12 cm), lateral generally 3–5 per side, ± obovate, toothed 1/4–1/2 to midvein, ± hairy
Inflorescence generally 2–30-flowered
Flower: hypanthium 3–6 mm wide; petals 3–10 mm, generally widely ovate, yellow to white; stamens ± 25, filaments 1–3.5 mm (longest opposite sepals), anthers 0.6–1.2 mm; styles ± 1–2.5 mm, attached below middle of fruit, ± fusiform and rough
Fruit ± 1 mm, smooth or ± ridged, golden to reddish brown
Chromosomes: n=7
Ecology: Common. Many habitats
Elevation: < 3800 m.
Bioregional distribution: California Floristic Province (except Great Central Valley), Great Basin Floristic Province
Distribution outside California: w N.America
Often confused with Horkelia ; despite much work, subspp. remain poorly defined.


subsp. ewanii D.D. Keck


Stem generally 5–20 cm, sparsely ± glandular-hairy
Leaves: basal generally 3–10 cm, sheathing base generally strigose, terminal leaflet generally 5–15 mm; lateral leaflet teeth < 10, generally single
Inflorescence: branch angle generally ± 50°
Flower not fully opening; bractlets < 0.5 mm wide; petals 3–4 mm, ± = sepals, yellow; styles 1.5–2.5 mm
Ecology: Edges of seeps, small waterways
Elevation: 1900–2400 m.
Bioregional distribution: San Gabriel Mountains (Mount Islip area)
Synonyms: P. peirsonii Munz misapplied
See the CNPS Inventory for information about endangerment and rarity.
previous taxon | next taxon
bioregional map for POTENTILLA%20glandulosa%20subsp.%20ewanii being generated

Retrieve Jepson Interchange Index to Plant Names entry for Potentilla glandulosa subsp. ewanii
Retrieve dichotomous key for Potentilla
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California