Crataegus cognata

Sargent

Rhodora 5: 58. 1903.

Endemic
Synonyms: Crataegus aperta Sargent C. patrum Sargent C. pruinosa var. cognata (Sargent) J. B. Phipps C. pruinosa var. latisepala (Ashe) Eggleston
Treatment appears in FNA Volume 9. Treatment on page 577. Mentioned on page 572, 574, 578.

Shrubs, 20–40 dm. Stems: main branches often suberect; twigs: new growth reddish-brown, 1-year old purple-brown, older dark gray; thorns on twigs numerous, straight to slightly recurved, 2-years old black, shiny, ± slender, 3–5 cm. Leaves: petiole length 28–36% blade, eglandular or with 1–2 glands distally; blade ovate, 3.5–5.5 cm, subcoriaceous, base broadly cuneate to truncate, lobes 3 (or 4) per side, sinuses shallow, lobe apex subacute, margins crenate-serrate, veins 5–7 per side, apex subacute, surfaces glabrous. Inflorescences 4-flowered or 5-flowered; branches glabrous; bracteole margins short-stipitate-glandular. Flowers 17–19 mm diam.; hypanthium glabrous; sepals narrowly triangular, 5 mm, base broad, margins subentire, abaxially glabrous; stamens 20, anthers white, 0.6–0.8 mm; styles 3 or 4. Pomes green with pink or purple pruinosity, becoming orange-red or crimson, 8–10 mm diam.; flesh thin; sepals on collar, spreading-reflexed; pyrenes 3 or 4.2n = 51.


Phenology: Flowering Apr–May; fruiting Sep–Oct.
Habitat: Successional fields, fencerows, brush, open wood margins
Elevation: 50–300 m

Distribution

V9 984-distribution-map.jpg

Ont., Mass., Mich., Mo., N.Y.

Discussion

Crataegus cognata in the strict sense occurs from Michigan to Massachusetts with the southern limits poorly understood. Specimens from Missouri with large (5–7 cm) leaf blades and no or only weakly developed lobes should be checked against C. pruinosa var. magnifolia.

Crataegus perjucunda Sargent, native to Middlesex County, Ontario, is a distinctive local species similar to C. cognata but with shorter (2–3 cm) and finer thorns as well as relatively wider leaves (length/width = 1.2).

Selected References

None.

Lower Taxa

None.

"eglandular" is not a number.

... more about "Crataegus cognata"
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 +
broadly cuneate +  and truncate +
Pruinosae +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
mid +  and dark green +
3.5 cm35 mm <br />0.035 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
short-stipitate-glandular +
few +  and numerous +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Ont. +, Mass. +, Mich. +, Mo. +  and N.Y. +
not +  and aggregated +
50–300 m +
1.7 cm17 mm <br />0.017 m <br /> (1.9 cm19 mm <br />0.019 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 +, purple-brown +  and reddish-brown +
older +, old +  and new +
Successional fields, fencerows, brush, open wood margins +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
5-flowered +  and 4-flowered +
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 +
with 1-2 glands +
Flowering Apr–May +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
crimson +, orange-red +, pruinosity +  and green with pink or green with purple +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
suborbicular +
not arillate +
persistent +
free +  and distinct +
spreading-reflexed +
triangular +
nonaccrescent +
5 cm50 mm <br />0.05 m <br /> (?) +
1-50-flowered +  and few-leaved +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
Crataegus aperta +, C. patrum +, C. pruinosa var. cognata +  and C. pruinosa var. latisepala +
Crataegus cognata +
Crataegus (sect. Coccineae) ser. Pruinosae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
slender +
3 cm30 mm <br />0.03 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 +
5 +  and 7 +