Crataegus formosa

Sargent

Proc. Rochester Acad. Sci. 4: 101. 1903.

Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 578. Mentioned on page 572.

Shrubs or trees, 50 dm. Stems: twigs: new growth reddish, 1-year old dark purple-brown, 2-years old gray-tan, older gray; thorns on twigs recurved, 2-years old dark-brown, shiny, older charcoal black, then gray, ± slender, 2.5–5 cm. Leaves: petiole length 30–36% blade, eglandular or slightly glandular; blade deltate (mainly on shoots with terminal inflorescence) to broadly rhombic-elliptic, 4–7 cm, subcoriaceous, base cuneate to nearly truncate, lobes 3 or 4 per side (larger leaves), sinuses moderately deep, lobe apex acute, margins serrate, veins 5 or 6 per side, apex acute, surfaces glabrous. Inflorescences 4–7-flowered; branches glabrous; bracteoles caducous, absent or several, margins glandular. Flowers 22–30 mm diam.; sepals triangular, 6 mm, margins subentire, abaxially glabrous; stamens 20, anthers white, 0.6–0.8 mm; styles 4 or 5. Pomes red, often ± angular, 10 mm diam., ± pruinose; sepals on collar, spreading; pyrenes 4 or 5.


Phenology: Flowering May; fruiting Sep–Oct.
Habitat: Brush
Elevation: 100–300 m

Discussion

Of conservation concern.

The known distribution of Crataegus formosa is very scattered. The species is one of the most beautiful hawthorns, and one specimen set the Crataegus record for flower size with a diameter of 38 mm (E. P. Kruschke 1965). Crataegus porteri Britton [including C. porteri var. caerulescens (Sargent) E. J. Palmer], from Pennsylvania, is similar but with smaller leaves and may be conspecific.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus formosa"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
James B. Phipps +
Sargent +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +  and nearly truncate +
Pruinosae +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
mid +  and dark green +
deltate +  and broadly rhombic-elliptic +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Ont. +, N.Y. +, Ohio +  and Wis. +
not +  and aggregated +
100–300 m +
2.2 cm22 mm <br />0.022 m <br /> (3 cm30 mm <br />0.03 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 +, gray-tan +, dark purple-brown +  and reddish +
older +, old +  and new +
Brush +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
sessile +  and craspedodromous +
subentire +
subentire +
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 +
glandular +  and eglandular +
Flowering May +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
10 cm100 mm <br />0.1 m <br /> (?) +
suborbicular +
Proc. Rochester Acad. Sci. +
not arillate +
persistent +
free +  and distinct +
triangular +
nonaccrescent +
6 cm60 mm <br />0.06 m <br /> (?) +
1-50-flowered +  and few-leaved +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
Crataegus formosa +
Crataegus (sect. Coccineae) ser. Pruinosae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
gray +, charcoal black +  and dark-brown +
straight +
older +  and old +
slender +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
thick +  and fine +
craspedodromous +  and gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
6 +  and 5 +
tree +  and shrub +