Crataegus ×disperma

Crataegus ×disperma Ashe

J. Elisha Mitchell Sci. Soc. 17: 14. 1900.

Endemic
Synonyms: Crataegus grandis Ashe C. pausiaca Ashe C. peoriensis Sargent C. punctata var. pausiaca (Ashe) E. J. Palmer
Treatment appears in FNA Volume 9. Treatment on page 637. Mentioned on page 543, 638.

Shrubs or trees, 50–80 dm. Stems: twigs: new growth reddish young, glabrous or pubescent, 1-year old shiny brown, glabrous, older dark gray; thorns on twigs 2-years old shiny, dark-brown, fine, 3–4 cm. Leaves deciduous; petiole 0.7–1.5 cm, winged nearly to base, glabrous; blade dark green, obovate or elliptic, 2.5–5 cm, subcoriaceous, base broadly to narrowly cuneate, lobes 0 or few, sinuses very shallow, margins serrate, venation craspedodromous, veins 5–7 per side, apex acute, surfaces glabrous. Inflorescences 5–12-flowered; branches glabrous; bracteoles caducous, linear, membranous, margins glandular. Flowers 13–18 mm diam.; hypanthium glabrous; sepals narrow, margins ± entire or subserrate; stamens 10, anthers pink or red-purple; styles 2 (or 3). Pomes deep red, ± oblong, 12–14 × 9–11 mm; sepals spreading, subsessile; pyrenes 2, dorsally grooved, sides plane.


Phenology: Flowering May; fruiting Sep–Oct.
Habitat: Brush, along streams
Elevation: 50–200 m

Distribution

V9 1095-distribution-map.jpg

Ill., Ind., Iowa, Ohio, Pa., Va.

Discussion

Crataegus ×disperma has been found sporadically from Iowa east to Virginia and Pennsylvania, where the ranges of C. punctata and C. crus-galli overlap.

Crataegus ×disperma belongs to a group of taxa intermediate between C. crus-galli and C. punctata; it may key to C. collina, although it has glossier leaves and usually fewer styles and pyrenes. Some specimens are more hairy, or with more strongly glandular-serrate sepal margins, than in the description, which is based on Ashe. Crataegus danielsii E. J. Palmer from Missouri, with glossy, more or less coriaceous, but lobed leaves is another problematic C. crus-galli × C. collina hybrid according to Palmer (1952). The pink-anthered C. ×disperma and cream-anthered C. ×incaedua are similar to C. collina var. sordida except for the number of styles and pyrenes (two or three).

Selected References

None.

Lower Taxa

None.
... more about "Crataegus ×disperma"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
red-purple +  and pink +
James B. Phipps +
Crataegus ×disperma Ashe +
compound +  and simple +
opposite +  and alternate +
cuneate +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
elliptic +  and obovate +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Ill. +, Ind. +, Iowa +, Ohio +, Pa. +  and Va. +
not +  and aggregated +
50–200 m +
1.3 cm13 mm <br />0.013 m <br /> (1.8 cm18 mm <br />0.018 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 />) +
dark gray +, brown +  and reddish +
older +, old +, young +  and new +
glabrous +  and pubescent +
Brush, along streams +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
craspedodromous +
subserrate +, entire +  and serrate +
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 +
0.7 cm7 mm <br />0.007 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering May +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
1.2 cm12 mm <br />0.012 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
J. Elisha Mitchell Sci. Soc. +
not arillate +
persistent +
free +  and distinct +
triangular +
1-50-flowered +  and few-leaved +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
Crataegus grandis +, C. pausiaca +, C. peoriensis +  and C. punctata var. pausiaca +
Crataegus ×disperma +
Crataegus +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
5 +  and 7 +
tree +  and shrub +