Crataegus jonesiae

Sargent

Bot. Gaz. 31: 14. 1901.

Common names: Jones hawthorn
Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 545. Mentioned on page 542, 546, 640.

Shrubs or trees, 60–70 dm. Stems: twigs: new growth ± densely appressed-pubescent, 1-year old pale tan, 2-years old olive gray, older gray; thorns on twigs: frequency not recorded, straight to recurved, 1-year old chestnut-brown, 2-years old shiny dark-brown or black, slender to stout, 3–6 cm. Leaves: petiole 1.5–3.5 cm, length 35–50% blade, pubescent, eglandular; blade broadly ovate to broadly rhombic-elliptic or nearly circular, 4–7 (–8) cm, length/width = 1–1.5, base tapered, wedge-shaped to subtruncate, lobes (4 or) 5–9 per side, obscure, lobe apex usually acute, margins doubly serrate, veins 5–10 per side, apex acute, abaxial surface densely appressed-pubescent on veins, adaxial appressed-pubescent young, sparsely pubescent or glabrescent later. Inflorescences 8–15 (–20) -flowered, lax; branches with antrorse pubescence; bracteoles membranous, margins glandular. Flowers 18–23 mm diam.; hypanthium densely pubescent; sepals 6–8 mm, margins ± entire, abaxially pubescent; stamens 10, anthers pink; styles 2 or 3 (or 4). Pomes bright red, oblong or obovoid, 10–15 mm diam., pubescent, glabrescent; sepals erect-patent; pyrenes 2 or 3 (or 4).


Phenology: Flowering Jun; fruiting Sep–Oct.
Habitat: Woodland glades, stream borders, rocky banks
Elevation: 10–200 m

Distribution

V9 922-distribution-map.jpg

N.B., N.S., P.E.I., Maine.

Discussion

Of conservation concern.

Reports of Crataegus jonesiae from Quebec have not been substantiated; vegetatively similar plants from Matapédia and Matane counties have shallowly, laterally scarred pyrenes; sepals are gland-margined and are barely denticulate.

Crataegus jonesiae is usually placed in ser. Anomalae. However, it is a particularly distinct species that has smooth pyrenes and other similarities to C. punctata, and the possibility of a hybrid origin should be considered; its leaves range from nearly entire, prototypically punctate, to sharply lobed as in C. chrysocarpa.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus jonesiae"
appressed-pubescent +
glabrescent +, pubescent +  and appressed-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
James B. Phipps +
Sargent +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
wedge-shaped +  and subtruncate +
Crataegus sect. Punctatae +
broadly ovate +  and broadly rhombic-elliptic +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Jones hawthorn +
N.B. +, N.S. +, P.E.I. +  and Maine. +
not +  and aggregated +
10–200 m +
1.8 cm18 mm <br />0.018 m <br /> (2.3 cm23 mm <br />0.023 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 +, olive gray +  and pale tan +
older +, old +  and new +
appressed-pubescent +
Woodland glades, stream borders, rocky banks +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
8-15(-20)-flowered +
crassinucellate +
deciduous +
craspedodromous +
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 +
post-mature +
pubescent +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Flowering Jun +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
bright red +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
glabrescent +  and pubescent +
obovoid +  and oblong +
not arillate +
persistent +
free +  and distinct +
erect-patent +
triangular +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1-50-flowered +  and few-leaved +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus sect. Mexicanae +  and Crataegus ser. +
Crataegus jonesiae +
Crataegus (sect. Coccineae) ser. Punctatae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
black +, dark-brown +, shiny +, old +  and chestnut-brown +
not straight +
slender +  and stout +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
determinate +
few +  and numerous +
not +  and pubescent +
5 +  and 10 +
tree +  and shrub +