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. arizonica (J.T. Howell) Ertter var. arizonica


Plants hanging clumps, green
Stem 5–10 cm
Leaf generally 5–10 cm, flat; sheathing bases generally glabrous; leaflets 2–4 per side, separated, 5–15 mm, ± round, ± evenly toothed or lobed < 3/4 to base; cauline leaves 1–3
Inflorescence open, generally < 10-flowered; pedicels 5–30 mm, often ± S-shaped in fruit
Flower 5–10 mm wide; hypanthium length 1–2 X width; bractlets generally 0; petals 2–3 mm, oblanceolate to elliptic, yellow, ± = sepals; stamens 5; pistils 2–10; receptacle stalked in pistil-bearing portion (unique in Ivesia )
Fruit 1.5–2 mm, ± ridged, pale
Ecology: UNCOMMON. Limestone crevices
Elevation: 1200–3100 m.
Bioregional distribution: n Desert Mountains (Inyo Co.)
Distribution outside California: s Nevada, nw Arizona
Flowering time: May–Aug
Var. saxosa (Brandegee) Ertter
Synonyms: Purpusia s. Brandegee
, rock purpusia, (NV) has white petals.
See the CNPS Inventory for information about endangerment and rarity.
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