Crataegus roribacca

Ashe

J. Elisha Mitchell Sci. Soc. 17: 4. 1900.

Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 566. Mentioned on page 562.

Trees, 40–70 dm. Stems: trunk bark dark gray, thin, scaly; twigs: new growth not recorded, 1-year old mid brown, ± glossy, older dark gray; thorns on twigs few, 1-year old color not recorded, 3–5 cm. Leaves: petiole length 50–60% blade, glandularity not recorded; blade ovate to broadly elliptic (suborbiculate or broadly deltate on extension shoots), 4–5.5 cm (larger on extension shoots), base broadly cuneate to truncate (truncate to cordate on extension shoots), lobes 0, or 3 or 4 per side, sinuses shallow, lobes often mere apiculi, margins serrate, teeth 1.5–3 mm, veins 6 or 7 per side, apex acuminate, adaxial surface densely crisp-pubescent young, glabrescent. Inflorescences 8–20-flowered; branches glabrous; bracteoles few, linear. Flowers 13–15 mm diam., hypanthium glabrous; sepal length not recorded, margins entire, abaxially glabrous; stamens 20, anthers purple; styles 3. Pomes dark red, sometimes with orange or orange-red spots, broadly pyriform, 14–17 mm diam., smooth; flesh pale-yellow; sepals recurved; pyrenes 3, dorsally deeply grooved.


Phenology: Flowering Apr; fruiting Sep.
Habitat: Habitat not recorded
Elevation: 600–700 m

Discussion

Of conservation concern.

Crataegus roribacca was found by Ashe in Swain County; no recent collection is known. The specimen studied (CM 289601) is in excellent condition and has all the hallmarks of ser. Tenuifoliae, although E. J. Palmer (1925) left it unassigned. The leaf differs from those of other members of the series in shape and size of marginal teeth, and from most in vein number. Crataegus roribacca does not seem to be a hybrid, so it is perhaps only an unusual form of C. schuettei.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus roribacca"
appressed-scabrous-pubescent +
glabrescent +  and crisp-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
pink +  and red or purple +
James B. Phipps +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
broadly cuneate +  and truncate +
Tenuifoliae +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
ovate +  and broadly elliptic +
4 cm40 mm <br />0.04 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
not +  and aggregated +
600–700 m +
pale-yellow +
1.3 cm13 mm <br />0.013 m <br /> (1.5 cm15 mm <br />0.015 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 />) +
dark gray +  and brown +
older +, old +  and new +
pubescent +  and glabrous +
Habitat not recorded +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
eglandular +  and craspedodromous +
subentire +
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 />) +
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 +
eglandular +  and sessile-glandular +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering Apr +  and fruiting Sep. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
orange-red spots +  and dark red +
1.4 cm14 mm <br />0.014 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
pyriform +
J. Elisha Mitchell Sci. Soc. +
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 +
glabrous +  and tomentose +
Crataegus sect. Tenuifoliae +
Crataegus roribacca +
Crataegus (sect. Coccineae) ser. Tenuifoliae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
stout +  and slender +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
craspedodromous +  and gland-tipped +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
inconspicuous +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
glabrescent +  and pilose +
7 +  and 6 +