Crataegus irrasa Sargent (Q4257)
Crataegus irrasa is a taxon with the rank species within the series Crataegus ser. Rotundifoliae
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| English |
Crataegus irrasa Sargent
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Crataegus irrasa is a taxon with the rank species within the series Crataegus ser. Rotundifoliae
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Statements
taxon/id/Crataegus irrasa Sargent
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Crataegus irrasa Sargent
Crataegus irrasa
Sargent
FNA Editorial Committee. 2014. Flora of North America north of Mexico. Volume 9: Magnoliophyta: Picramniaceae to Rosaceae. Oxford University Press, New York.
accepted
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Newfoundland, CA
excluded
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CA-ON
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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.
CA-QC
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Marie-Victorin, Fr. 1995. Flore laurentienne. 3e éd. Mise à jour et annotée par L. Brouillet, S.G. Hay, I. Goulet, M. Blondeau, J. Cayouette et J. Labrecque. Gaétan Morin éditeur. 1093 pp.
CA-NL
Nfld. and Labr. (Nfld.)
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CA-ON
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CA-QC
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US-CT
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US-NY
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US-WI
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Shrubs, spreading into broad thickets, 30–60 dm.
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twigs: new growth olive or orange-green, slender, marked by large, oblong, pale lenticels, glabrous, 1-year old light, grayish, or deep reddish-brown, at end of 1d year often deep redbrown, 2-years old gray or light-brown tinged with red, older ashy gray;
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thorns on twigs numerous, straight, 1-year old shiny, deep redbrown, older dark gray, ultimately ashy gray, stout, 3–6 cm.
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Leaves: stipules oblong-obovate, to falcate and acuminate on extension shoots, glandular-serrate, acuminate, villous;
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petiole length 33–40% blade, slightly winged distally, adaxially villous young, glandular, glands minute, dark red;
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blade ovate-oblong to oblong, (4–) 5–7 (–8) cm (more than 1/2 grown at anthesis), on extension shoots similar, larger, thin to chartaceous, base cuneate to nearly truncate, lobes 5 or 6 per side, sinuses moderately deep (max LII 15%), lobe apex acute, ± triangular, margins serrulate, veins 5–7 per side, apex acute, abaxial surface glabrous, adaxial appressed-scabrous, glabrescent.
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Inflorescences 9–12-flowered;
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bracteoles linear, small, membranous, margins sessile-glandular.
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Flowers 13–15 mm diam.;
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hypanthium glabrous or pubescent;
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sepals reflexed after flowering, tapering from broad bases, short, margins minutely, bright red glandular, apex acute, abaxially villous;
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stamens 20, anthers pale-yellow, small;
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Pomes in broad, multi-fruited clusters, drooping or erect on stout branches;
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reddish, suborbicular to oblong, 12–14 mm diam., glabrous or pubescent;
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sepals persistent, sometimes until following spring, prominent, appressed to spreading;
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pyrenes 4 or 5, full and rounded at ends.
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winged
33-40%; slightly; distally
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drooping
in broad , multi-fruited clusters
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