Crataegus delawarensis

Sargent

Bot. Gaz. 35: 102. 1903.

Conservation concernEndemic
Synonyms: Crataegus pruinosa var. delawarensis (Sargent) E. J. Palmer
Treatment appears in FNA Volume 9. Treatment on page 568. Mentioned on page 569.

Shrubs, 10–20 dm. Stems: twigs: new growth light green at first, pubescence not recorded, 1-year old dull redbrown, marked by occasional large, oblong lenticels, 2-years old light gray-brown; thorns on twigs straight or slightly curved, 1-year old dark redbrown, slender, 3–4 cm. Leaves: stipules linear, acuminate, coarsely glandular-serrate; petiole length not recorded, distally slightly wing-margined, grooved, pubescence not recorded, glandular, glands deciduous, few, dark red, small; blade abaxial paler than adaxial, light yellow green adaxially, rhombic to ovate, 5–6 cm length/width = 1.8–2, membranous, base narrowed from near mid-blade, or base broadly cuneate and entire on vigorous shoots, lobes 3 or 4 per side distally, short, lobe apex acute, margins finely, sometimes doubly, serrate, teeth gland-tipped, veins 3 or 4 per side, apex acute, surfaces glabrous. Inflorescences 5–8-flowered; branches glabrous; bracteoles reddish, acute, margins glandular. Flowers 15 mm diam.; hypanthium usually glabrous, sometimes hairy; sepals broadly triangular, margins coarsely glandular-serrate, apex acuminate; stamens 10, anthers pale-yellow; styles 3 or 4, arising from rough tomentum. Pomes dark red, suborbicular, 11–12 mm diam. wider than tall, not pruinose; sepals closely appressed; pyrenes 3 or 4, dorsally prominently grooved.


Phenology: Flowering Apr; fruiting Sep–Oct.
Habitat: Brush
Elevation: 20–100 m

Discussion

Of conservation concern.

Crataegus delawarensis is known only from northern Delaware; it differs from other members of the series by its narrow leaf blades and yellow anthers.

Selected References

None.

Lower Taxa

None.

"wider than tall" is not a number.

... more about "Crataegus delawarensis"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
pale-yellow +
James B. Phipps +
Sargent +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +  and narrowed +
7 cm70 mm <br />0.07 m <br /> (8 cm80 mm <br />0.08 m <br />) +
green +, light yellow +  and paler +
5cm +  and 6cm +
rhombic +  and ovate +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
not +  and aggregated +
20–100 m +
15 cm150 mm <br />0.15 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 />) +
deciduous +
light gray-brown +, redbrown +  and light green +
old +  and new +
Brush +
hairy +  and glabrous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
glandular-serrate +  and serrate +
short-stipitate-glandular +
subentire or +  and shallowly moderately glandular-serrate +
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 +
sessile-glandular +  and glandular +
wing-margined +
not glandular +
Flowering Apr +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
not pruinose +
1.1 cm11 mm <br />0.011 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
suborbicular +
not arillate +
persistent +
free +  and distinct +
patent +  and reflexed +
triangular +
nonaccrescent +
1-50-flowered +  and few-leaved +
shallow +  and deep +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
Crataegus pruinosa var. delawarensis +
Crataegus delawarensis +
Crataegus (sect. Coccineae) ser. Populneae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
dark redbrown +
straight +
slender +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
curved +  and straight +
determinate +
4 +  and 3 +