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

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. aperta (J.T. Howell) Munz

Plant tufted, greenish or white-hairy; caudex 0–few-branched
Stem decumbent to erect, 15–45 cm
Leaf 10–20 cm; sheathing bases densely strigose; leaflets 20–35 per side, lobes < 5, 3–15 mm, elliptic to oblanceolate; cauline leaves 3–8
Inflorescence open; clusters many, 10–20 mm wide, ± head-like, ± 5–20-flowered; pedicels generally < 3 mm (except lowest), straight
Flower 5–15 mm wide; hypanthium length < or = width; petals 2–7 mm, oblanceolate to obovate, yellow, < to > sepals; stamens generally 20; pistils 2–7
Fruit 2–3 mm, smooth, brown
Ecology: Dry, rocky meadows, generally volcanic soils
Elevation: 1500–2300 m.
Bioregional distribution: n High Sierra Nevada, s Modoc Plateau
Distribution outside California: w Nevada


var. canina Ertter


Stem decumbent to ascending
Inflorescence: clusters generally < 10-flowered
Flower: hypanthium 4–5 mm wide; petals generally 4–7 mm, ± obovate; filaments 2–4 mm; styles 3–4 mm
Ecology: UNCOMMON. Habitats of sp.
Elevation: 1600–2000 m.
Bioregional distribution: n High Sierra Nevada (Dog Valley, e Sierra Co.).
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for IVESIA%20aperta%20var.%20canina being generated

Retrieve Jepson Interchange Index to Plant Names entry for Ivesia aperta var. canina
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