Crataegus douglasii Lindley (Q4365)

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Crataegus douglasii is a taxon with the rank species within the series Crataegus ser. Douglasianae
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English
Crataegus douglasii Lindley
Crataegus douglasii is a taxon with the rank species within the series Crataegus ser. Douglasianae

    Statements

    taxon/id/Crataegus douglasii Lindley
    0 references
    Crataegus douglasii Lindley
    Crataegus douglasii
    Lindley
    FNA Editorial Committee. 2014. Flora of North America north of Mexico. Volume 9: Magnoliophyta: Picramniaceae to Rosaceae. Oxford University Press, New York.
    accepted
    aubépine du Columbia (French)
    aubépine de Douglas (French)
    aubépine noire (French)
    black hawthorn (English)
    Douglas' hawthorn (English)
    black-fruited hawthorn (English)
    Columbia hawthorn (English)
    river hawthorn (English)
    Douglas or black hawthorn (English)
    1 reference
    Moss, E.H. 1983. Flora of Alberta. 2nd edition, revised by J.G. Packer. University of Toronto Press, Toronto. 687 pp.
    1 reference
    Douglas, G.W., G.B. Straley, D.V. Meidinger & J. Pojar. 1998. Illustrated Flora of British Columbia. B.C. Ministry of Environment, Lands & Parks and B.C. Ministry of Forests. Victoria. Crown Publications. 8 vols.
    1 reference
    Newmaster, S.G., A. Lehela, M.J. Oldham, P.W.C. Uhlig & S. McMurray. 1998. Ontario Plant List. Ontario Forest Research Institute, Sault Ste. Marie, Ontario. Forest Information Paper No. 123. 550 pp.
    1 reference
    Scoggan, H.J. 1978-79. The Flora of Canada. Parts 1-4. National Museum of Natural Sciences, Publications in Botany 7. 4 volumes.
    1 reference
    Harms, V.L. 2006. Annotated catalogue of Saskatchewan vascular plants. http://www.biodiversity.sk.ca/Docs/AnnotatedCatalogueSKVascPlants2006.pdf
    Flowering May–Jun; fruiting Sep–Oct.
    old fields
    fencerows
    woodland edges
    Shrubs, 40–80 dm.
    Stems: 1-year old twigs deep tan to dark mahogany, ± shiny young, older gray to dark gray, often showing brown or alternatively tan-brown eastward;
    thorns on twigs straight or slightly recurved, deep brown young, (1.5–) 2–3.5 cm.
    Leaves: petiole 0.7–1.5 cm, pubescent young, slightly glandular;
    blade usually elliptic to broadly elliptic or subrhombic (elliptic-obovate when lobes very small), 4–7 cm, lobes 2–4 per side, sinuses shallow, LII 10–20%, lobe apex subobtuse to acute, margins coarsely, sharply serrate, teeth small, gland-tipped young, venation craspedodromous, veins 4 or 5 per side, apex acute to obtuse, abaxial surface usually glabrous except on veins, adaxial densely short-appressed-pubescent.
    Inflorescences 10–25-flowered;
    branches glabrous;
    bracteole margins stipitate or sessile-glandular.
    Flowers 10–15 mm diam.;
    hypanthium glabrous;
    sepals broadly triangular, 3–4 mm, margins sparsely glandular, adaxially glabrous;
    stamens 10, anthers pink;
    Pomes vinous and usually waxy glaucous young, dull black mature, usually ellipsoid, 6–8 mm diam., glabrous;
    sepal remnants reflexed, apex obtuse;
    pyrenes 3 or 4, sides excavated, sometimes only shallowly.