Crataegus ×dispessa

Crataegus ×dispessa Ashe

J. Elisha Mitchell Sci. Soc. 19: 17. 1903.

Endemic
Basionym: Crataegus pyriformis Britton Bull. New York Bot. Gard. 1: 449. 1900,
Synonyms: C. treleasei Sargent
Treatment appears in FNA Volume 9. Treatment on page 638. Mentioned on page 552, 639.

Trees, 55 dm. Stems: twigs: new growth canescent, 1-year old dark-brown, older gray; thorns on twigs absent or few, straight or slightly curved, 1-year old dark purple, 3 cm. Leaves deciduous; petiole slender, length 33–43% blade, distally winged, densely pubescent, eglandular; blade elliptic to suborbiculate, 3–7 cm, base cuneate, lobes 0 or 1–3 per side, apiculi, margins sharply serrate, venation craspedodromous, veins 5 per side, sharply impressed, apex acute, surfaces glabrate, glabrescent, abaxial veins densely pubescent, adaxial appressed-pubescent young. Inflorescences 10–20-flowered; branches tomentose; bracteoles caducous, numerous, linear, ± membranous, margins glandular. Flowers 20–25 mm diam.; hypanthium canescent; sepals narrowly triangular, margins glandular-serrate to glandular-laciniate, abaxial surface densely pubescent; stamens 20, anthers cream, sometimes pink; styles 4 or 5. Pomes crimson, suborbicular, 12–17 mm diam., pubescent; sepals erose or patent; pyrenes 4 or 5, dorsally grooved, sides plane.


Phenology: Flowering May; fruiting Sep–Oct.
Habitat: Brush, along streams and woodland margins
Elevation: 100–200 m

Discussion

Crataegus ×dispessa is found in southern Missouri to Boone County and was last collected in Dallas County.

Crataegus ×dispessa is probably of ser. Molles × C. collina var. hirtiflora parentage, the bracteole type not being characteristic of ser. Molles.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus ×dispessa"
appressed-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
pink +  and cream +
James B. Phipps +
Crataegus ×dispessa Ashe +
compound +  and simple +
opposite +  and alternate +
cuneate +
Crataegus pyriformis +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
elliptic +  and suborbiculate +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
not +  and aggregated +
100–200 m +
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 />) +
gray +  and dark-brown +
older +, old +  and new +
Brush, along streams and woodland margins +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
craspedodromous +
glandular-serrate +  and 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 +
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 /> (1.7 cm17 mm <br />0.017 m <br />) +
suborbicular +
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 +
glabrescent +  and glabrate +
C. treleasei +
Crataegus ×dispessa +
Crataegus +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
dark purple +
curved +  and straight +
3 cm30 mm <br />0.03 m <br /> (?) +
craspedodromous +  and gland-tipped +
inconspicuous +