Flora of the Southeastern United States
2022 Edition

Colors

Data mode

Key to Convolvulus

1 Leaves about as wide as long, rounded at the tip
1 Leaves longer than wide, obtuse , acute, or acuminate at the tip.
..2 Flowers double, the corolla deeply divided into many parts; [garden escape occasionally naturalized]
..2 Flowers not double, corolla entire.
....3 Calyx not concealed by 2 large bracts (the bracts small and on the pedicel at a distance below the calyx); corollas < 3 cm long.
......4 Calyx 3-5 mm long; leaves sparsely pubescent; leaves entire and unlobed (except for the 2 basal lobes; corolla margins lacking sharp tips; [widespread in our area]
......4 Calyx 6-12 mm long; leaves sparsely to densely gray-pubescent; leaves entire, toothed, or deeply lobed (in addition to the 2 basal lobes; entire and unlobed (except for the 2 basal lobes; corolla margins lacking sharp tips; [se. KS, sw. AR, e. and s. TX westwards and southwards (and rarely a waif eastwards].
........5 Leaves deltoid in outline, thick, markedly veined, silvery-pubescent, and with dentate margins; seed coats smooth; [s. TX]
........5 Leaves variable in outline, thin, not markedly veined, thinly pubescent, and with margins dentate or not; seed coats papillose; [se. KS, sw. AR, e. and s. TX westwards and southwards (and rarely a waif eastwards].
....3 Calyx concealed by 2 large bracts; corollas > 3 cm long.
..........6 Leaves densely white-tomentose beneath
..........6 Leaves pubescent or glabrous, but not densely white-tomentose beneath.
............7 Stems mostly less than 1.5 m, erect at least in the lower part, but sometimes twining toward the apex, flowers mostly borne in lower leaf axils.
..............8 Stems twining in the upper part; mostly 0.5-1.4 m high; leaves overtopping stem apex by < 1 cm.
................9 Leaves whitish-pubescent; corolla 44-64 (-70) mm long; [east of the Mississippi River]
................9 Leaves grayish-puberulent; corolla (35-) 40-52 (-69) mm long; [west of the Mississippi River]
..............8 Stems not twining, up to 0.6 m high; leaves overtopping the stem apex by 1.5-6 cm.
..................10 Stem and leaves glabrous to pubescent; leaves more or less flat at maturity, with basal lobes 0-5 mm long
..................10 Stem and leaves tomentose; leaves tending to be folded along midrib at maturity, with basal lobes 1-11mm long
............7 Stems strongly twining, up to 4 m or more long; flowers borne along middle and upper stems.
....................11 Margins of the bracts immediately subtending the flower overlapping > ½ their length; bracts inflated at base (saccate), the apex usually obtuse; flowers 1-2 per axil
....................11 Margins of the bracts immediately subtending the flower overlapping at the base only or not at all; bracts mostly flat (or often keeled, the apex usually acute; flowers 1 per axil.
......................12 Bracteoles forming a continuous spiral series with sepals, the flower appearing to have 3 bracteoles when seen from side; leaves with almost closed sinus, the lobes posteriorly truncate
......................12 Bracteoles clearly distinct from sepals, obviously only 2; leaves with a wide or v-shaped sinus.
........................13 Corolla pink.
..........................14 Leaves with basal lobes rounded or with a single angle, or if with 2 angles then not spreading; plant glabrous or commonly pubescent to tomentose on stem
..........................14 Leaves with lobes with 2 angles, spreading; plant glabrous
........................13 Corolla white.
............................15 Corolla 35-50 mm long; stamens 17-25 mm long; leaf sinus acute (V-shaped); plant glabrous
............................15 Corolla 48-70 mm long; stamens 25-32 mm long; leaf sinus acute or rounded (U-shaped); plant glabrous or pubescent.
..............................16 Leaves with spreading basal lobes, each lobe more or less 2-angled, sinus broadly rounded; plant glabrous; WV and northwards and westwards]
..............................16 Leaves with posteriorly directed lobes, the blade often conspicuously narrowly triangular to linear; stems and leaves often strongly pubescent; [Coastal Plain]