Crest-rib morning glory

Ipomoea costellata var. edwardsensis O’Kennon & G. L. Nesom

Annuals. Stems usually trailing, or twining only near tips, rarely erect. Leaf blades palmatisect, lobes 5–9, lance-linear, linear, oblanceolate, or spatulate, 7–28 × 0.5–3(–8) mm, surfaces glabrous or sparsely hispidulous. Peduncles usually glabrous, rarely sparsely hispidulous. Flowers: 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.

Flowering Jul–Nov. Chaparral, oak woodlands, ponderosa pine zone, rocky sites; 100–2200 m; Ariz., N.Mex., Tex.; Mexico; introduced in South America.