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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

CRATAEGUS HAWTHORN

James B. Phipps


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: northern temperate. (Greek: hard, for wood) [Phipps & O'Kennon 2002 Sida 20:115–144] Several species cultivated, escaped.
Unabridged note: Various species cultivated 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.

Key to Crataegus

1. Short-shoot leaves deeply lobed, veined to sinuses; fruit red to deep red ..... C. monogyna

1' Short-shoot leaves unlobed to shallowly lobed, not veined to sinuses; fruit deep purple to black

2. Stamens ± 20; short-shoot leaves unlobed to shallowly lobed; thorns 8–12 mm ..... C. gaylussacia

2' Stamens ± 10; short-shoot leaves generally shallowly lobed; thorns 15–23 mm

3. Inflorescence hairy; thorns 18–23 mm ..... C. castlegarensis

3' Inflorescence glabrous; thorns 15–18 mm ..... C. douglasii

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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].
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