Crataegus roribacca
J. Elisha Mitchell Sci. Soc. 17: 4. 1900.
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
"thin" is not a number."entire" is not a number."glabrous" is not a number."adnate" is not a number."dm" is not declared as a valid unit of measurement for this property.