Jepson Flora Project: Jepson Interchange    

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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

Perennial, glandular; odor resinous
Leaves generally basal, odd-1-pinnate, generally ± cylindric; cauline reduced; leaflets generally overlapped, generally divided ± to base
Inflorescence: cyme
Flower: hypanthium shallow or deep; bractlets (0)5, generally < sepals; sepals generally 5; petals generally 5, acute to rounded; stamens generally < or = 20; pistils 1–many, ovaries superior, style jointed below fruit tip, base ± rough-thickened
Fruit: achene
Species in genus: 30 species: w North America
Etymology: (E. Ives, Yale Univ. pharmacologist, 1779–1861)
Reference: [Ertter 1989 Syst Bot 14:231–244]
Lf and leaflet data are for basal leaves.


I. saxosa (Greene) Ertter

Plants hanging clumps, green
Stem 5–30 cm
Leaf generally 5–15 cm, flat; sheathing bases ± glabrous; leaflets 2–4 per side, separated, generally 5–15 mm, ± round, shallowly and evenly toothed to unevenly lobed ± to base; cauline leaves 2–4
Inflorescence open, few–many-flowered; pedicels 7–30 mm, generally ± S-shaped in fruit
Flower 7–10 mm wide; hypanthium length < 1/2 width; petals 2–4 mm, oblanceolate to obovate, yellow, < sepals; stamens 15–40; pistils 3–20
Fruit 1–1.5 mm, ± ridged, pale
Ecology: Granitic or volcanic crevices
Elevation: 900–3000 m.
Bioregional distribution: s High Sierra Nevada, San Bernardino Mountains, Peninsular Ranges, East of Sierra Nevada, Desert Mountains
Distribution outside California: n Baja California
Flowering time: Apr–Aug
Synonyms: Potentilla s. Greene including subsp. sierrae Munz
Stamen number, leaf lobing, hairiness variations apparently not useful taxonomically.

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