Ipomoea leonensis B.L. Rob.

Wood, John R. I., Munoz-Rodriguez, Pablo, Williams, Bethany R. M. & Scotland, Robert W., 2020, A foundation monograph of Ipomoea (Convolvulaceae) in the New World, PhytoKeys 143, pp. 1-823 : 1

75. Ipomoea leonensis B.L. Rob. , Proc. Amer. Acad. Arts 26: 170. 1891. (Robinson 1891: 170)

Type.

MEXICO. Nuevo León, 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 × 4 cm, ovate-deltoid, obtuse, base very broadly cuneate so some leaves subrhomboid; older leaves up to 12 × 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 × 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 León: type collection.

Note.

The shape of the mature leaves is very distinct as is the tuberculate lower part of the petiole.