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.



Thomas J. Rosatti

Shrub or tree, generally thorny
Leaves stipuled, petioled, deciduous, toothed to lobed
Inflorescence: racemes at branch tips
Flower: hypanthium cup- to urn-shaped, bractlets 0; sepals becoming reflexed; petals generally white; stamens 5–25; ovary inferior, styles 1–5, free
Fruit: pome, drupe-like, purple-black and glabrous in CA; stones 1–5, generally 1-seeded
Species in genus: ± 300 species: n temp
Etymology: (Greek: flower thorn, used by Theophrastus?; or strength, from strong wood or thorns)
Reference: [Brunsfeld & Johnson 1990 Madroño 37:274–282]
C. erythropoda may occur in e D; C. monogyna Jacq. escaped from or persistent beyond cultivated, perhaps naturalized. Many hybrids and morphologically identifiable clones.


C. douglasii Lindl.

Stem: older thorns 13–18 mm
Leaf 2–9 cm; blade base wedge-shaped, entire, margin above base toothed, generally lobed, tips truncate
Flower 14–16 mm wide when dry; sepals entire to ± gland-toothed; stamens (5–)10; ovary often ± hairy, styles generally 5
Fruit generally many per inflorescence, 9–10 mm wide when fresh; stone ± 5 mm, outer face rounded, plump, sides shallowly pitted
Chromosomes: 2n=34
Ecology: Streamsides, forest, meadows, grassland, sagebrush scrub
Elevation: 700–1700 m.
Bioregional distribution: Modoc Plateau
Distribution outside California: to Alaska, east-central N.America
Some plants may = C. columbiana Howell (hairier, styles generally 2–4, older thorns 2–7 cm, sepals strongly gland-toothed)
Horticultural information: SUN: 4, 5, 6, 15, 16, 17 &IRR: 1, 2, 7, 10, 14, 18.

previous taxon | next taxon
bioregional map for CRATAEGUS%20douglasii being generated

Retrieve Jepson Interchange Index to Plant Names entry for Crataegus douglasii
Retrieve dichotomous key for Crataegus
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