Crataegus exilis

Beadle

Biltmore Bot. Stud. 1: 76. 1902.

Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 632. Mentioned on page 618, 619, 620.
Revision as of 12:47, 30 July 2020 by imported>Volume Importer
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Shrubs, 20–40 dm, branches ± weeping. Stems: trunk bark dark gray or brownish, rough; upper twigs suberect, others ± spreading; twigs slightly flexuous, new growth pubescent, 1-year old light gray-brown, older gray-brown; thorns on twigs few, straight, dark, 1–1.5 cm. Leaves: petiole length 25–30% blade, winged distally, pubescent young, glandularity not recorded; blade broadly obovate to broadly rhombic-elliptic, the smaller ± oblong-cuneate, 1.5–2.5 (–3) cm, firm to subcoriaceous, base tapered, lobes 0, or 1 (or 2) per side, subterminal, sinuses shallow (LII to 10%), lobe apex subacute, margins crenate-serrate (distal 1/2), veins 3 per side, apex subacute, surfaces pubescent young, particularly abaxially on veins, glabrescent; on extension shoots deeply incised. Inflorescences 3–7-flowered; branches pilose-pubescent; bracteoles oblong-linear, margins glandular. Flowers 15 mm diam.; hypanthium pilose; sepals narrowly triangular, 3–4 mm, margins subentire or finely glandular-serrate, abaxial pubescence not recorded; anthers cream or ivory; styles 3–5. Pomes red, orbicular, 5–7 mm diam., glabrous; sepals usually erose; pyrenes 3–5.


Phenology: Flowering Mar–Apr; fruiting Aug–Sep.
Habitat: Sandy soil, stream banks
Elevation: 60 m

Discussion

Of conservation concern.

Crataegus exilis is only known from the type locality in south-central Georgia. Its appearance is distinctive; unfortunately, it is known only from flowering and fruiting syntypes. The species is somewhat anomalous in ser. Lacrimatae and slightly resembles a larger C. calva (ser. Apricae) but has pilose inflorescence branches, slightly different leaf shape, and somewhat different leaf margins.

Selected References

None.

Lower Taxa

None.

"thin" is not a number."winged" is not a number."adnate" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Crataegus exilis"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
ivory +  and cream +
subacute +
James B. Phipps +
Beadle +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
tapered +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
oblong-cuneate +, broadly obovate +  and broadly rhombic-elliptic +
smaller +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
firm +  and subcoriaceous +
semipersistent +, caducous +  and deciduous +
pilose-pubescent +
adnate +  and distinct +
crowded +, scattered +  and alternate +
spreading +  and pendulous +
not +  and aggregated +
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 />) +
gray-brown +  and light gray-brown +
older +, old +  and new +
Sandy soil, stream banks +
constricted +
crassinucellate +
deciduous +
subterminal +
eglandular +  and craspedodromous +
short-pubescent +
glandular-serrate +  and subentire +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
firm +  and coriaceous +
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 />) +
circular +  and elliptic +
0 (?) +  and 4 (?) +
pale paper brown +
free +  and distinct +
post-mature +
Flowering Mar–Apr +  and fruiting Aug–Sep. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
orbicular +
Biltmore Bot. Stud. +
not arillate +
circumscissile +
persistent +
free +  and distinct +
triangular +
nonaccrescent +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1-50-flowered +  and few-leaved +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrescent +  and pubescent +
Crataegus exilis +
Crataegus (sect. Coccineae) ser. Lacrimatae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
slender +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
flexuous +
determinate +