A foundation monograph of Ipomoea (Convolvulaceae) in the New World Author Wood, John R. I. Author Munoz-Rodriguez, Pablo Author Williams, Bethany R. M. Author Scotland, Robert W. text PhytoKeys 2020 143 1 823 http://dx.doi.org/10.3897/phytokeys.143.32821 journal article http://dx.doi.org/10.3897/phytokeys.143.32821 1314-2003-143-1 F6F11A6EE4FF5A1885CEA2B60AE965A5 75. Ipomoea leonensis B.L. Rob. , Proc. Amer. Acad. Arts 26 : 170. 1891. (Robinson 1891: 170) Type. MEXICO. Nuevo Leon , Monterrey, C.G. Pringle 2840 (holotype GH00054512, isotype VT). Description. Perennial with woody, tuberous rootstock; stems probably trailing. Leaves petiolate, polymorphic, young leaves up to 7 x 4 cm, ovate-deltoid, obtuse, base very broadly cuneate so some leaves subrhomboid; older leaves up to 12 x 14 cm, digitately 7-lobed to just halfway, the central lobe oblong-elliptic, the inner four oblong, the outermost two ovate with a broad, basal appendage, base subcordate and cuneate onto the petiole, adaxially thinly punctate, abaxially tomentose when young, glabrescent; petioles 2-6 cm, glandular-tuberculate near base of older leaves. Inflorescence of solitary (or paired) pedunculate flowers arising in the axils of foliose 7-partite bracts; peduncles 3-5 cm; bracteoles scale-like, caducous; pedicels 1.5-2 cm; sepals subequal c. 8 5 x 5 mm, ovate, rounded, canescent; corolla 5-7 cm long, pubescent in bud, purple, limb c. 5 cm diam. Capsules and seeds unknown. Distribution. Endemic to north east Mexico, apparently only known from the type. MEXICO. Nuevo Leon : type collection. Note. The shape of the mature leaves is very distinct as is the tuberculate lower part of the petiole.