Crataegus orbicularis

J. B. Phipps & O’Kennon

Sida 20: 138, fig. 9. 2002.

Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 507. Mentioned on page 503.

Shrubs, widespreading, 20–40 dm. Stems: twigs: new growth sparsely pubescent, 1-year old strong mid brown, older dull gray; thorns on twigs straight or more often recurved, slender, 3–5 cm. Leaves: petiole 1.2–2 cm, adaxially short-hairy, usually eglandular; blade broadly elliptic to suborbiculate, 5–8 cm, thin, base curved in wider blades, ± attenuate in narrower ones, lobes 3 or 4 per side, short-triangular, margins serrate, teeth very small, except near base, veins 5 or 6 (or 7) per side, apex ± subacute, abaxial surface glabrate, veins hairy, adaxial short-appressed-hairy. Inflorescences 10–18-flowered; branches sparsely villous throughout, sometimes glabrate distally; bracteole margins sessile-glandular. Flowers 18 mm diam.; hypanthium glabrate; sepals narrowly triangular, 5–6 mm, margins finely glandular-serrate, abaxial pubescence not recorded; stamens 10, anthers pink; styles 3 or 4. Pomes in showy infructescences, brick-red (mid to late Aug) becoming deep burgundy (Sep), ± oblong, 7–10 mm diam., glabrate; sepals ± erect, wide, length not recorded; pyrenes 3 or 4, sides shallowly pitted or almost plane.


Phenology: Flowering May; fruiting Sep–Oct.
Habitat: Brush, natural hedgerows
Elevation: 300–400 m

Discussion

Of conservation concern.

Crataegus orbicularis is known only from within a few miles of Enderby. The species is readily distinguished from sympatric taxa by the unusual pale yellowish green color of the foliage when young, leaf shape, large flowers, and small glabrous pomes with prominent erect sepals.

Selected References

None.

Lower Taxa

None.

"wide" is not a number.

... more about "Crataegus orbicularis"
short-appressed-hairy +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
James B. Phipps +
J. B. Phipps & O’Kennon +
exfoliating +  and plated +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
compound +  and simple +
opposite +  and alternate +
attenuate +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
broadly elliptic +  and suborbiculate +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
dark gray-brown +
glabrate +  and villous +
adnate +  and distinct +
crowded +, scattered +  and alternate +
not +  and aggregated +
300–400 m +
18 cm180 mm <br />0.18 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 brown +
older +, old +  and new +
Brush, natural hedgerows +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
obscure +  and evident +
short-triangular +
glandular-serrate +  and serrate +
denticulate +
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 +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering May +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
coriaceous-leaved +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
burgundy +  and brick-red +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not arillate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
persistent +
free +  and distinct +
triangular +
accrescent +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
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 +
glabrous +  and tomentose +
Crataegus orbicularis +
Crataegus (sect. Douglasia) ser. Purpureofructus +
species +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
blackish brown +, redbrown +, dark-brown +  and old +
straight +
slender +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
craspedodromous +
inconspicuous +
1 +  and few +
straight +
determinate +
6 +  and 5 +