Crataegus flabellata

(Bosc ex Spach) K. Koch

Verh. Vereins Beförd. Gartenbaues Königl. Preuss. Staaten, ser. 2, 1: 240. 1853.

Common names: Fan-leaved hawthorn aubépine flabelliforme
Endemic
Basionym: Mespilus flabellata Bosc ex Spach Hist. Nat. Vég. 2: 63. 1834
Synonyms: Crataegus crudelis Sargent C. flabellata var. densiflora Kruschke C. flabellata var. grayana (Eggleston) E. J. Palmer C. grayana
Treatment appears in FNA Volume 9. Treatment on page 567. Mentioned on page 494, 561, 562, 563, 565, 594.

Shrubs or trees, 40–50 dm. Stems: 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. Leaves: 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. Inflorescences 5–10-flowered; branches villous; bracteole frequency not recorded, linear. Flowers 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. Pomes crimson, ± ellipsoid, 8–10 mm diam., sometimes ± pruinose; sepals spreading or usually erose, not or obscurely elevated; pyrenes 3–5, dorsally deeply grooved. 2n = 51.


Phenology: Flowering May–Jun; fruiting Sep–Oct.
Habitat: Brush, successional fields, fencelines, woodland edges, open woodlands
Elevation: 10–200 m

Distribution

V9 963-distribution-map.jpg

N.B., N.S., Ont., Que., Conn., Maine, Mass., N.H., N.Y., Vt.

Discussion

Crataegus flabellata 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.

Crataegus flabellata 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 C. fluviatilis. In spite of the obvious differences in morphology and range, C. flabellata and C. macrosperma often have been combined by floristicians. From C. chrysocarpa, C. flabellata 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 C. chrysocarpa are densely hairy, practically tomentose, unlike C. flabellata 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 C. flabellata, this species represents the result of ancient hybridization between C. chrysocarpa and C. macrosperma.

Crataegus flabellata 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. Crataegus crudelis, also from Quebec, is a form recognized by long thorns (to 10 cm).

The name Crataegus densiflora Sargent, which pertains to C. flabellata, is illegitimate.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus flabellata"
appressed-scabrous-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
James B. Phipps +
(Bosc ex Spach) K. Koch +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +  and slightly rounded +
Mespilus flabellata +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
broadly elliptic +  and ovate +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
few +  and several +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Fan-leaved hawthorn +  and aubépine flabelliforme +
N.B. +, N.S. +, Ont. +, Que. +, Conn. +, Maine +, Mass. +, N.H. +, N.Y. +  and Vt. +
not +  and aggregated +
10–200 m +
1.3 cm13 mm <br />0.013 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
yellow +  and red or purplish +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
gray +, chestnut-brown +  and reddish +
older +, old +  and new +
Brush, successional fields, fencelines, woodland edges, open woodlands +
villous +  and glabrous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
eglandular +, glandular +  and glandular-serrate +
short-stipitate-glandular +
subentire +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
elliptic +  and circular +
0 (?) +  and 4 (?) +
free +  and distinct +
post-mature +
eglandular +  and sessile-glandular +
glandular +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1mm +  and 2mm +
Flowering May–Jun +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
ellipsoid +
Verh. Vereins Beförd. Gartenbaues Königl. Preuss. Staaten, ser. +
not arillate +
persistent +
free +  and distinct +
triangular +
nonaccrescent +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1-50-flowered +  and few-leaved +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus crudelis +, C. flabellata var. densiflora +, C. flabellata var. grayana +  and C. grayana +
Crataegus flabellata +
Crataegus (sect. Coccineae) ser. Tenuifoliae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
stout +  and slender +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
glabrescent +  and pilose +
6 +  and 5 +
tree +  and shrub +