Crataegus ouachitensis

E. J. Palmer

J. Arnold Arbor. 7: 124. 1926.

Common names: Ouachita hawthorn
Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 591. Mentioned on page 586, 587, 592.

Shrubs or trees, 40–60 dm. Stems: twigs: new growth not recorded, 1-year old dark purplish, older gray; thorns on twigs ± straight, 2-years old dark purple, fine, 2–4 cm. Leaves: petiole very slender, 0.5 mm wide, length ca. equal to or 50–66% blade, sparsely hairy or glabrous, slightly glandular or eglandular; blade ovate to deltate-ovate, (2–) 3–4 cm, thin, base broadly rounded to nearly truncate or subcordate, lobes 1–3 per side obscure, sinuses shallow, lobe apex subacute, margins sharply serrate nearly to base, veins 3 per side, apex acuminate, abaxial surface sparsely to ± densely hairy on veins, adaxial variable scabrous, glabrescent. Inflorescences 3–8-flowered; branches glabrous or sparsely villous; bracteoles not recorded. Pedicels glabrous or ± tomentose young. Flowers 15–18 mm diam.; hypanthium not seen; sepal length not recorded, margins glandular-serrate or subentire; stamens 20, anthers pink or rose to rose-purple; styles 3 or 4. Pomes green until late, becoming bright red, obovoid to pyriform, 8–15 mm diam., glabrous; flesh hard; sepals on collar, strongly reflexed; pyrenes 3 or 4.

Discussion

Varieties 2.

Crataegus ouachitensis is endemic to the Ouachita Mountains. Among ser. Intricatae, the species is distinct because of its small leaves, only slightly glandular nature, 20 stamens, and bright red pomes. The delicate leaves and pome color recall C. wootoniana (ser. Tenuifoliae). Crataegus ouachitensis is also similar to Louisianan 58. C. iracunda, differing primarily in having 20 stamens and conspicuously glandular-serrate sepal margins in the type form. Crataegus ouachitensis is very rare and likely of interserial hybrid origin, though it could also plausibly be referred to ser. Pulcherrimae. Crataegus thermopegea E. J. Palmer, from the same area, is perhaps related; it has laterally pitted pyrenes and probably ten stamens, according to Palmer.

Selected References

None.

Key

1 Petioles 50–66% length of blade; inflorescence branches glabrous; pedicels glabrous; sepal margins glandular-serrate. Crataegus ouachitensis var. ouachitensis
1 Petioles ca. equal to length of blade; inflorescence branches sparsely villous; pedicels ± tomentose young; sepal margins subentire. Crataegus ouachitensis var. minor
... more about "Crataegus ouachitensis"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
rose +  and rose-purple +
James B. Phipps +
E. J. Palmer +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
broadly rounded +  and nearly truncate or subcordate +
Intricatae +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
ovate +  and deltate-ovate +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
villous +  and glabrous +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Ouachita hawthorn +
not +  and aggregated +
1.5 cm15 mm <br />0.015 m <br /> (1.8 cm18 mm <br />0.018 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 dark purplish +
older +, old +  and new +
pubescent +  and tomentose +
hairy +  and glabrous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
craspedodromous +
subentire +  and glandular-serrate +
stipitate-glandular +
glandular-serrate +  and glandular-pectinate +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
tomentose +  and glabrous +
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 +
eglandular +  and glandular +
glabrous +  and hairy +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
bright red +  and green +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
obovoid +  and pyriform +
J. Arnold Arbor. +
not arillate +
persistent +
free +  and distinct +
triangular +
nonaccrescent +
1-50-flowered +  and few-leaved +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
Crataegus sect. Flavae +  and Crataegus ser. +
Crataegus ouachitensis +
Crataegus (sect. Coccineae) ser. Intricatae +
species +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
dark purple +
straight +
slender +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
buff to gray-brown +  and corrugated +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
tree +  and shrub +