Jepson Herbarium
		University of California, Berkeley

Directory       News       Site Map       Home

Indexes to all accepted names and synonyms: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

Annual to tree, glandular or not.
Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous.
Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel (" pedicel bractlets") generally 0–3(many), subtended by bract or generally not.
Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets (" hypanthium bractlets") 0–5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5–many, anther pollen sacs generally 2; pistils (0)1–many, simple or compound, ovary superior to inferior, styles 1–5.
Fruit: 1–many per flower, achene ( fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1–5 stones.
Seed: generally 1–5 (per fruit, not per flower).
110 genera, ± 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. [Potter et al. 2007 Plant Syst Evol 266:5–43] Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis. —Scientific Editors: Daniel Potter, Thomas J. Rosatti.
Unabridged references: [Robertson 1974 J Arnold Arbor 55:303–332, 344–401, 611–662]

Key to Rosaceae

Shrub, tree, thorny.
Leaf: simple, alternate, petioled, ± ovate, generally ± lobed above middle, toothed, deciduous.
Inflorescence: panicle on short- shoot tips, domed; pedicel bractlets several to many, ± 5 mm, narrow, margins glandular.
Flower: hypanthium urn-shaped, bractlets 0; sepals small, margins entire to finely toothed, generally glandular; petals white; stamens ± 10 or 20; ovary inferior, styles 1–5, free.
Fruit: pome, drupe-like, red to black, generally lighter in color before fully mature, core of 1–5 laterally pitted stones [or not]; sepals reflexed [or not].
± 200 species: n temperate. (Greek: hard, for wood) [Phipps & O'Kennon 2002 Sida 20:115–144] Several species cultivated, escaped.
Unabridged note: Various species cult in arboreta, escaped elsewhere; several species in retail commerce, e.g., Crataegus ×media Sarg. cvs (generally misnamed as Crataegus laevigata (Poir.) DC. or Crataegus oxyacantha L.), Crataegus monogyna cvs, Crataegus phaenopyrum (L. f.) Medik.

Stem: thorns 15–18 mm.
Leaf: of short- shoots 3.5–6 cm, ± elliptic-diamond-shaped to narrow-obovate, base wedge-shaped, generally shallowly lobed, tip acute.
Inflorescence: glabrous.
Flower: 12–15 mm diam; sepals distally glandular-serrate; stamens ± 10, anthers pink; styles 3–4.
Fruit: 10–12 mm diam, spheric [to elliptic], deep purple to black, stones 3–4.
2n=68. Streamsides in meadows, scrub, forest; 600–2450 m. Klamath Ranges, Cascade Range, n High Sierra Nevada;

Previous taxon: Crataegus castlegarensis
Next taxon: Crataegus gaylussacia

Contact/Feedback

Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].

Copyright © 2012 Regents of the University of California
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.

Bioregions in which taxon occurs	Red area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon; markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
Chart based on elevation range in Manual and elevations and coordinates of CCH records. Data provided by the participants of the Consortium of California Herbaria. Note: About half of the CCH records include both elevation and coordinates.	Map made in collaboration with Scott Loarie. Data provided by the participants of the Consortium of California Herbaria. View all CCH records   CCH collections by month Duplicates counted once; synonyms included. Species do not include records of infraspecific taxa. Blue line denotes Manual flowering time.