Ipomoea costellata
Ipomoea lacunosa
crest-rib morning glory
pitted morningglory, small white morning glory, white morning-glory, whitestar
usually trailing, or twining only near tips, rarely erect.
twining.
blades palmatisect, lobes 5–9, lance-linear, linear, oblanceolate, or spatulate, 7–28 × 0.5–3(–8) mm, surfaces glabrous or sparsely hispidulous.
blades cordate-ovate, deltate-ovate, ovate, or 3(–5)-lobed, 30–80 × 20–70 mm, base ± cordate, basal lobes rounded or pointed, surfaces glabrous or sparsely hairy.
usually glabrous, rarely sparsely hispidulous.
glabrous, sometimes muricate.
sepals lance-oblong to lanceolate, outers 3–5 × 1–2 mm, inners 4–6 × 2–3 mm, herbaceous, apex acute, abaxial surface usually ± carinate and glabrous, sometimes hispidulous on midrib;
corolla pale lavender to pink, funnelform, 10–12 mm.
sepals elliptic-oblong, lanceolate, or lance-ovate, (8–)11–14 mm, chartaceous or coriaceous, margins ciliate, apex acuminate, surfaces glabrous;
corolla usually white, limb sometimes pink tinged, funnelform, 15–20(–25) mm.
10–13 mm diam. 2n = 30.
Ipomoea costellata
Ipomoea lacunosa
Plants of Ipomoea lacunosa are sometimes confused with plants of I. × leucantha, which are derived from hybridization between I. lacunosa and I. cordatotriloba (D. F. Austin and W. E. Abel 1981). Seeds of Ipomoea lacunosa are 5–6 mm and seeds of I. × leucantha are 3.2–4 mm.
Reports of Ipomoea lacunosa for Ontario, California, and New York are apparently based on waifs.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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