View source for Crataegus flabellata

{{Treatment/ID
|accepted_name=Crataegus flabellata
|accepted_authority=(Bosc ex Spach) K. Koch
|publications={{Treatment/Publication
|title=Verh. Vereins Beförd. Gartenbaues Königl. Preuss. Staaten, ser.
|place=2, 1: 240. 1853
|year=1853
}}
|common_names=Fan-leaved hawthorn;aubépine flabelliforme
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms={{Treatment/ID/Basionym
|name=Mespilus flabellata
|authority=Bosc ex Spach
|publication_title=Hist. Nat. Vég.
|publication_place=2: 63. 1834
}}
|synonyms={{Treatment/ID/Synonym
|name=Crataegus crudelis
|authority=Sargent
}} {{Treatment/ID/Synonym
|name=C. flabellata var. densiflora
|authority=Kruschke
}} {{Treatment/ID/Synonym
|name=C. flabellata var. grayana
|authority=(Eggleston) E. J. Palmer
}} {{Treatment/ID/Synonym
|name=C. grayana
|authority=unknown
}}
|hierarchy=Rosaceae;Rosaceae subfam. Amygdaloideae;Rosaceae tribe Gillenieae;Crataegus;Crataegus sect. Coccineae;Crataegus (sect. Coccineae) ser. Tenuifoliae;Crataegus flabellata
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Rosaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Rosaceae subfam. Amygdaloideae]]</div><div class="higher-taxon"><small>tribe</small>[[Rosaceae tribe Gillenieae]]</div><div class="higher-taxon"><small>genus</small>[[Crataegus]]</div><div class="higher-taxon"><small>section</small>[[Crataegus sect. Coccineae]]</div><div class="higher-taxon"><small>series</small>[[Crataegus (sect. Coccineae) ser. Tenuifoliae]]</div><div class="higher-taxon"><small>species</small>[[Crataegus flabellata]]</div></div>
|volume=Volume 9
|mention_page=page 494, 561, 562, 563, 565, 594
|treatment_page=page 567
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs </b>or trees, 40–50 dm. <b>Stems</b>: twigs: new growth reddish at first, usually sparsely pubescent, 1-year old deep chestnut brown, older dull gray; thorns on twigs 1-year old shiny, dark brown, stout to slender, 4–6 cm. <b>Leaves</b>: petiole 1–2 mm wide, length 40–50% blade, glandular; blade glossy, dark green, broadly elliptic to ovate, 4–7 cm, base cuneate to slightly rounded, lobes 4 or 5 per side, sinuses deep, lobe apex acuminate, margins sharply serrate, teeth gland-tipped, veins 5 or 6 per side, apex acute, abaxial surface glabrous except along veins, adaxial densely appressed-scabrous young, glabrescent. <b>Inflorescences</b> 5–10-flowered; branches villous; bracteole frequency not recorded, linear. <b>Flowers</b> 13–17 mm diam.; hypanthium glabrous or villous at base; sepals 4–5 mm, margins entire, glandular to glandular-serrate, rarely nearly eglandular, apex acute, abaxial pubescence not recorded; stamens 5–10 or 20, anthers usually pink; styles 3–5. <b>Pomes</b> crimson, ± ellipsoid, 8–10 mm diam., sometimes ± pruinose; sepals spreading or usually erose, not or obscurely elevated; pyrenes 3–5, dorsally deeply grooved. <b>2n</b> = 51.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Jun; fruiting Sep–Oct.
|habitat=Brush, successional fields, fencelines, woodland edges, open woodlands
|elevation=10–200 m
|distribution=N.B.;N.S.;Ont.;Que.;Conn.;Maine;Mass.;N.H.;N.Y.;Vt.
|discussion=<p><i>Crataegus flabellata</i> occurs along the Niagara Escarpment in Ontario, on both sides of Lake Ontario and the St. Lawrence, to New Brunswick and Nova Scotia, and to Massachusetts. Reports for Newfoundland have not been substantiated.</p><!--
--><p><i>Crataegus flabellata</i> is distinctive with its leaf blades glossy dark green, ovate to broadly elliptic, cuneate at the base, and with deep acuminate lobes. Specimens with less glandularity or serration of the sepal margins may resemble <i>C. fluviatilis</i>. In spite of the obvious differences in morphology and range, <i>C. flabellata</i> and <i>C. macrosperma</i> often have been combined by floristicians. From <i>C. chrysocarpa</i>, <i>C. flabellata</i> is distinguished by its shinier, ellipsoid, glabrous fruit, by the usually deeper, acuminate lobes of its glossy, dark green leaves, and by longer, slightly more acute sepals. Typically, the inflorescences and hypanthia of eastern <i>C. chrysocarpa</i> are densely hairy, practically tomentose, unlike <i>C. flabellata</i> with its more sparsely hairy pedicels and glabrous distal hypanthia. It is conceivable that, due to morphological intermediacy and the sympatry of all three species within the range of <i>C. flabellata</i>, this species represents the result of ancient hybridization between <i>C. chrysocarpa</i> and <i>C. macrosperma</i>.</p><!--
--><p><i>Crataegus flabellata</i> is usually divided into two varieties: var. flabellata (10 stamens) and var. grayana (20 stamens), the latter being particularly common in southern Quebec. There appears to be little, if any, other constant differentiating feature. <i>Crataegus</i> crudelis, also from Quebec, is a form recognized by long thorns (to 10 cm).</p><!--
--><p>The name <i>Crataegus</i> densiflora Sargent, which pertains to <i>C. flabellata</i>, is illegitimate.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Crataegus flabellata
|author=
|authority=(Bosc ex Spach) K. Koch
|rank=species
|parent rank=series
|synonyms=Crataegus crudelis;C. flabellata var. densiflora;C. flabellata var. grayana;C. grayana
|basionyms=Mespilus flabellata
|family=Rosaceae
|phenology=Flowering May–Jun; fruiting Sep–Oct.
|habitat=Brush, successional fields, fencelines, woodland edges, open woodlands
|elevation=10–200 m
|distribution=N.B.;N.S.;Ont.;Que.;Conn.;Maine;Mass.;N.H.;N.Y.;Vt.
|reference=None
|publication title=Verh. Vereins Beförd. Gartenbaues Königl. Preuss. Staaten, ser.
|publication year=1853
|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V9/V9_963.xml
|subfamily=Rosaceae subfam. Amygdaloideae
|tribe=Rosaceae tribe Gillenieae
|genus=Crataegus
|section=Crataegus sect. Coccineae
|series=Crataegus (sect. Coccineae) ser. Tenuifoliae
|species=Crataegus flabellata
}}<!--

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