Crataegus (sect. Coccineae) ser. Dilatatae

Man. Cult. Trees ed. 2, 362. 1940.

Endemic
Basionym: Dilatatae Sargent Silva 13: 33. 1902
Treatment appears in FNA Volume 9. Treatment on page 578. Mentioned on page 525, 526, 558, 579.

Shrubs or trees, 40–70 dm, main trunk dominant. Stems: trunk bark buff to darker, fibrous, checked into longitudinal plates, freshly exposed bark orangebrown; branches spreading; twigs ± straight, new growth glabrous or pilose, 1-year old shiny, dark-brown to sometimes tan, 2-years old deep gray, older pale; thorns on twigs numerous, usually ± recurved, 2-years old blackish, shiny, moderately thick, 3–6 cm. Leaves: petiole length 30–50% blade, glabrous or sparsely hairy, usually sparsely glandular, sometimes eglandular; blade mid to dark green, ovate to broadly ovate or ovate-deltate, (4–) 5–9 (–11) cm, subcoriaceous, base subcordate to truncate or broadly cuneate, lobes 3–5 per side, sinuses shallow, lobe apex acute, margins ± serrate, teeth large, venation craspedodromous, veins 5–7 per side, apex acute, abaxial surface glabrous, adaxial sometimes appressed-pubescent young. Inflorescences 5–12-flowered, convex panicles; branches glabrous or pilose; bracteoles caducous (larger ± persistent), hyaline to red-tinged, (larger) oblong to curved, membranous to semiherbaceous, margins stipitate-glandular. Flowers 20–25 mm diam.; hypanthium glabrous or pilose; sepals triangular, much shorter than petals, margins glandular-laciniate; stamens 20; anthers white to rose-red; styles (4 or) 5. Pomes bright pink to crimson, suborbicular, 10–20 (–25) mm diam., glabrous or pubescent at ends; flesh ± hard (until overripe); sepals spreading or ± reflexed, nonaccrescent; pyrenes 5.

Distribution

c, e North America

Discussion

Species 1.

Series Dilatatae appears to be closely related to ser. Pruinosae, from which it is distinguished by often hairy adaxial leaf surfaces and inflorescence branches, at least some bracteoles more or less hard and persistent, more deeply dissected sepals, usually larger, non-angular pomes lacking elevated calyces, and by all the parts being equal to or greater than the normal upper size range for ser. Pruinosae.

Selected References

None.

appressed-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
white +  and rose-red +
James B. Phipps +
Loudon +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
subcordate +  and truncate or broadly cuneate +
Dilatatae +
9 cm90 mm <br />0.09 m <br /> (11 cm110 mm <br />0.11 m <br />) +
ovate +  and broadly ovate or ovate-deltate +
5 cm50 mm <br />0.05 m <br /> (9 cm90 mm <br />0.09 m <br />) +
hyaline +  and red-tinged +
pilose +  and glabrous +
adnate +  and distinct +
crowded +, scattered +  and alternate +
c +  and e North America +
not +  and aggregated +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 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 />) +
pale +, gray +, tan +  and dark-brown to sometimes +
older +, old +  and new +
pilose +  and glabrous +
pilose +  and glabrous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
stipitate-glandular +
glandular-laciniate +
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 +
hairy +  and glabrous +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
bright pink +  and crimson +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
pubescent +  and glabrous +
suborbicular +
Man. Cult. Trees ed. +
not arillate +
persistent +
free +  and distinct +
reflexed +  and spreading +
triangular +
nonaccrescent +
1-50-flowered +  and few-leaved +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus (sect. Coccineae) ser. Dilatatae +
Crataegus sect. Coccineae +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
slender +  and stout +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
craspedodromous +
inconspicuous +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
5 +  and 7 +
tree +  and shrub +