Calystegia catesbeiana
Calystegia subacaulis
Catesby's false bindweed
Hill morning glory, hillside false bindweed
pubescent to tomentose, hairs usually whitish.
moderately to sparsely hairy, hairs appressed, retrorse, or spreading.
usually twining-climbing, sometimes proximally erect, distally twining-climbing, to 40–200(–300) cm.
ascending-decumbent, to 20–30 cm or almost absent.
blade elliptic-ovate, to 120 × 50 mm, base lobed, lobes obtuse or rounded, to 20 mm.
in basal rosettes or not;
blade rounded-deltate to triangular-hastate, 30–40 mm, base usually cuneate, sometimes lobed, lobes retrorse, 1-pointed or rounded, margins not or weakly undulate, apex acuminate, acute, rounded, or subacute.
immediately subtending sepals, lanceolate, 12–34 × 10–22 mm, proximally ± keeled, margins ± enfolding sepals, apex acute.
immediately subtending sepals, lanceolate, oblong, or broadly ovate, 7–17 × 1.5–9 mm, shorter, or slightly longer, than sepals, proximally usually flat, sometimes keeled, apex usually rounded, sometimes acute.
sepals 11–17 mm;
corolla white, 44–64(–70) mm.
sepals 10–13 mm;
corolla white or cream, sometimes pink- to purplish-striped or -tinged, 33–62 mm.
Calystegia catesbeiana
Calystegia subacaulis
Subspecies 2 (2 in the flora).
Plants of Calystegia catesbeiana, especially subsp. catesbeiana, often have been misidentified as C. sepium because of their climbing habit.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Subspecies 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Stems usually weakly twining-climbing, sometimes proximally erect, to 40(–100) cm; leaf blades to 60 mm, basal lobes obtuse or rounded, to 11 mm, surfaces usually pubescent, abaxial rarely whitish. | subsp. catesbeiana |
1. Stems twining-climbing to 200(–300) cm; leaf blades to 120 mm, basal lobes rounded, 9–20 mm, surfaces densely pubescent to tomentose, abaxial usually whitish. | subsp. sericata |
1. Herbage moderately to sparsely hairy, hairs retrorse to spreading; stems almost absent or to 2 cm; leaves in basal rosettes, blade apices usually rounded to acuminate, sometimes subacute; bracts (4–)6–9 mm wide. | subsp. subacaulis |
1. Herbage sparsely hairy, hairs appressed; stems ascending-decumbent, to 20–30 cm; leaves not in basal rosettes, blade apices acute; bracts 1.5–4 mm wide. | subsp. episcopalis |
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