Calystegia catesbeiana
Calystegia macrostegia
Catesby's false bindweed
island false bindweed, island morning glory
pubescent to tomentose, hairs usually whitish.
glabrescent, glabrous, or ± hairy, including puberulent and/or pubescent.
usually twining-climbing, sometimes proximally erect, distally twining-climbing, to 40–200(–300) cm.
prostrate, weakly trailing, or twining-climbing, to 100 cm, or strongly twining-climbing, to 900+ cm.
blade elliptic-ovate, to 120 × 50 mm, base lobed, lobes obtuse or rounded, to 20 mm.
blade linear or broadly to narrowly triangular, to 130 × 1–120 mm, basally lobed, lobes 2–3-pointed or rounded, basal sinus acute, rounded, or ± quadrate.
immediately subtending sepals, lanceolate, 12–34 × 10–22 mm, proximally ± keeled, margins ± enfolding sepals, apex acute.
immediately subtending sepals, lanceolate to ovate or suborbiculate, (6–)8–30(–37) × 4–30 mm, proximally flat, keeled, or saccate.
sepals 11–17 mm;
corolla white, 44–64(–70) mm.
sepals 7–25 mm;
corolla white or cream, sometimes fading pink to purplish, 22–68 mm.
Calystegia catesbeiana
Calystegia macrostegia
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 6 (6 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. Bracts 16–30 mm wide, proximally keeled or saccate. | → 2 |
2. Bracts 13–23(–26); sepals 10–17(–22) mm; corollas 36–55(–60) mm; stamens 17–26 mm. | subsp. macrostegia |
2. Bracts (19–)22–30(–37); sepals 16–25 mm; corollas 47–68 mm; stamens 23–32 mm. | subsp. amplissima |
1. Bracts 4–16 mm wide, proximally flat, keeled, or ± saccate. | → 3 |
3. Bract apices acuminate, emarginate, or obtuse. | subsp. cyclostegia |
3. Bract apices acute. | → 4 |
4. Herbage ± grayish pubescent. | subsp. arida |
4. Herbage glabrous or puberulent, usually glabrescent. | → 5 |
5. Leaf blades broadly to narrowly triangular, (7–)12–20(–30) mm wide excluding lobes. | subsp. intermedia |
5. Leaf blades linear to narrowly triangular, 1–7 mm wide excluding lobes. | subsp. tenuifolia |
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