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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. sericoleuca (Rydb.) Rydb.


Plant tufted, greenish to white-hairy; caudex 0–few-branched
Stem generally decumbent to ascending, 15–45 cm
Leaf 10–20 cm; sheathing bases densely strigose; leaflets 20–35 per side, lobes 1–4, 3–15 mm, elliptic to oblanceolate; cauline leaves 3–8
Inflorescence open; clusters ± 5–20, 10–20 mm wide, ± head-like, ± 5–10-flowered; pedicels < 3 mm (except lowest), straight
Flower 10–15 mm wide; hypanthium length ± 1–2 X width; petals 4–7 mm, widely obovate to obcordate, white, > sepals; stamens generally 20; pistils 2–7
Fruit 2–3 mm, smooth, brown
Chromosomes: n=14
Ecology: Dry, generally volcanic meadows
Elevation: 1500–2200 m.
Bioregional distribution: n High Sierra Nevada, s Modoc Plateau (Sierra Valley).Plants from Truckee River drainage generally less hairy, inflorescence more open, flower smaller. Related to I. pityocharis Ertter (NV, flatter hypanthium, 8–20 pistils).
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for IVESIA%20sericoleuca being generated

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