Crataegus magniflora

Sargent

Bot. Gaz. 35: 383. 1903.

Endemic
Synonyms: Crataegus dayana Sargent C. hillii Sargent C. macounii Sargent
Treatment appears in FNA Volume 9. Treatment on page 560. Mentioned on page 558.

Shrubs or trees, 40–70 dm. Stems: twigs: new growth greenish, glabrous or sparsely hairy; thorns on twigs straight to recurved, usually ± stout, 2–4 cm. Leaves: petiole length 30–40% blade, nearly glabrate to hairy, glandular or eglandular; blade ovate to deltate-ovate, 6–10 cm, base broadly ± cordate or rounded to truncate, lobe apex acute, margins serrate, sometimes doubly serrate, teeth 2 mm, adaxial usually densely scabrous young. Inflorescences: branches sparsely to densely pubescent. Flowers: hypanthium glabrous or densely pubescent; stamens 20, anthers pink to rose-purple. Pomes usually bright red, suborbicular to ± ovoid, 10–14 mm, often sparsely pubescent (especially at ends); sepals ± spreading or missing. 2n = 68 (as C. corusca).


Phenology: Flowering May; fruiting Sep–Oct.
Habitat: Brush, woodland margins, fencerows, overgrown pastures
Elevation: 20–300 m

Distribution

V9 950-distribution-map.jpg

Ont., Ill., Mass., Mich., N.Y., Pa., Wis.

Discussion

Crataegus magniflora ranges through the southern Great Lakes area from Illinois and Wisconsin to Pennsylvania and Massachusetts. Two forms occur, one with a more nearly truncate leaf base, which is more common in Ontario, and a more fulleriana-like form, which is most common westward.

The leaf of Crataegus magniflora is most similar to that of C. coccinea var. coccinea but differs in usually being a little larger, often relatively wider (length/width sometimes equal to 1.1), and in the base being more truncate to more or less cordate than is usual in var. coccinea. Crataegus magniflora was often identified as C. corusca Sargent before it was recognized that the latter represented a putative interserial hybrid of ser. Coccineae × ser. Molles origin.

Selected References

None.

Lower Taxa

None.

"nearly glabrate" is not a number.

... more about "Crataegus magniflora"
appressed-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
pink +  and rose-purple +
James B. Phipps +
Sargent +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
less cordate or rounded +  and truncate +
Crataegus sect. Coccineae +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
bright green +
ovate +  and deltate-ovate +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Ont. +, Ill. +, Mass. +, Mich. +, N.Y. +, Pa. +  and Wis. +
not +  and aggregated +
20–300 m +
1.6 cm16 mm <br />0.016 m <br /> (2.2 cm22 mm <br />0.022 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 />) +
hairy +  and glabrous +
Brush, woodland margins, fencerows, overgrown pastures +
pubescent +  and glabrous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
short-stipitate-glandular +
serrate +  and crenate +
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 glandular +
Flowering May +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
bright red +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
suborbicular +  and more or less ovoid +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
not arillate +
persistent +
free +  and distinct +
missing +  and spreading +
triangular +
nonaccrescent +
1-50-flowered +  and few-leaved +
shallow +  and more or less deep +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus dayana +, C. hillii +  and C. macounii +
Crataegus magniflora +
Crataegus (sect. Coccineae) ser. Coccineae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
brown +  and dark blackish +
straight +
slender +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
craspedodromous +
2 cm20 mm <br />0.02 m <br /> (?) +
inconspicuous +
exfoliating +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
few +  and numerous +
5 +  and 7 +
tree +  and shrub +