Crataegus reverchonii

Sargent

Trees & Shrubs 1: 55, plate 28. 1903.

Common names: Reverchon hawthorn
EndemicIllustrated
Treatment appears in FNA Volume 9. Treatment on page 537. Mentioned on page 534.

Shrubs, 10–30 (–80) dm. Stems: twigs: new growth glabrous, 1-year old dark gray; thorns on twigs slightly reflexed, 2-years old blackish, usually stout, 3–6 cm. Leaves: petiole 2–5 mm, length 7–11% blade, glabrous, eglandular; blade (on extension shoots) ± orbiculate to broadly elliptic, (on short-shoots) ± orbiculate to broadly oblongelliptic, 2–6 cm, very coriaceous, base broadly cuneate, lobes 0, margins serrulate in distal 1/2, venation semicamptodromous, veins 5 or 6 per side, apex subacute to obtuse, surfaces sparsely hairy young, glabrescent. Inflorescences 8–15-flowered; branches usually glabrous; bracteoles linear, small, margins short-stipitate-glandular. Flowers 8–12 mm diam.; hypanthium glabrous, sometimes slightly pilose; sepals 4 mm, margins subentire, abaxially glabrous; stamens 10–15 (–20), anthers cream, rose, or red; styles (2 or) 3–5. Pomes red to orange-red, suborbicular, 10 mm diam., glabrous; sepals persistent, patent or reflexed; pyrenes (1–) 3–5.

Distribution

V9 901-distribution-map.jpg

Ala., Ark., Del., Ga., Kans., La., Miss., Mo., Okla., Tenn., Tex.

Discussion

Varieties 3 (3 in the flora).

Crataegus reverchonii is differentiated from C. crus-galli by a greater number of styles and pyrenes (except for var. mohrii) and extension-shoot leaves that tend to be suborbiculate. Distinction from a small-leaved form of C. crus-galli from the Edwards Plateau, Texas, needs elucidation. Crataegus stevensiana is sometimes separated out as a variety or species; however, the complex, unresolved variation makes this distinction moot at the moment.

The principal variation within Crataegus reverchonii is between smaller-statured, smaller-leaved, smaller-fruited, more-styled, xeromorphic plants of the southwest (var. reverchonii), and larger-leaved, large-flowered, fewer-styled plants of the mid latitude, eastern United States (var. palmeri). Variety mohrii is intermediate.

Selected References

None.

Key

1 Short-shoot leaf blades 4–6 cm; flowers 10–12 mm diam.; styles (2 or)3. Crataegus reverchonii var. palmeri
1 Short-shoot leaf blades 2–3.5 cm; flowers 8–12 mm diam.; styles 3–5 > 2
2 Flowers 8–10 mm diam.; inflorescences usually glabrous; w of Mississippi River. Crataegus reverchonii var. reverchonii
2 Flowers 12 mm diam.; inflorescences often pilose; e of Mississippi River. Crataegus reverchonii var. mohrii
... more about "Crataegus reverchonii"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
red +, rose +  and cream +
James B. Phipps +
Sargent +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +
Crataegus sect. Crus-galli +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
green +  and paler green +
glossy +  and bright +
less orbiculate +  and broadly elliptic more or less orbiculate +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
glandular-punctate +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Reverchon hawthorn +
Ala. +, Ark. +, Del. +, Ga. +, Kans. +, La. +, Miss. +, Mo. +, Okla. +, Tenn. +  and Tex. +
not +  and aggregated +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 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 />) +
old +  and new +
pilose +  and glabrous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
craspedodromous +
glabrous +  and short-stipitate-glandular +
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 +
glabrescent +  and villous +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
red +  and orange-red +
10 cm100 mm <br />0.1 m <br /> (?) +
suborbicular +
Trees & Shrubs +
not arillate +
persistent +
free +  and distinct +
reflexed +  and patent +
triangular +
4 cm40 mm <br />0.04 m <br /> (?) +
1-50-flowered +  and few-leaved +
Endemic +  and Illustrated +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrescent +  and hairy +
Crataegus reverchonii +
Crataegus (sect. Coccineae) ser. Crus-galli +
species +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
straight +
reflexed +  and recurved +
medium +  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 +
6 +  and 5 +