Ipomoea mucronifolia

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

67. Ipomoea mucronifolia J.R.I. Wood & Scotland, Kew Bull. 50 (31): 46. 2015. (Wood et al. 2015: 46)

Type.

BOLIVIA. Santa Cruz, Prov. Chiquitos, entre Limoncito y Roboré, J.R.I. Wood & P. Pozo 25064 (holotype USZ, isotypes K, LPB).

Description.

Trailing perennial; stem densely villous, glabrescent when old. Leaves petiolate, mostly 4-8 × 4-8 cm, shallowly cordate with the base broadly cuneate, auricles rounded, 3(-5)-lobed, the 4th and 5th lobes often poorly developed, lobes broadly ovate, elliptic or obovate, often overlapping, acute or obtuse and strongly mucronate wth mucro 2-3 mm long, densely grey appressed-pilose on both surfaces but abaxially paler; petioles 2.5-7 cm, softly pilose. Inflorescence of pedunculate, (2-)5-flowered, axillary cymes; peduncles 5.5-14 cm, pilose; bracteoles 3-7 × 1 mm, lanceolate, scarious, pilose, somewhat persistent; secondary peduncles 0.6-1.8 cm; pedicels 0.6-1.2 cm, pilose; sepals minutely gland-dotted on the exterior, unequal, outer 12-14 × 4 mm, broadly lanceolate, shortly acuminate, adpressed-pilose; inner 13-14 × 5 mm, oblong-obovate, rounded to acute, the central region pubescent, marginal part broad, glabrous, margin sparsely ciliate; corolla 5.5-6 cm long, pink, funnel-shaped, the limb c. 5 cm diam., distinctly lobed with ovate acute lobes, densely pilose in bud but somewhat glabrescent, the midpetaline bands thinly pilose on open corollas. Capsules and seeds not seen.

Illustration.

Figure 45 .

Distribution.

A species of the northern Chaco growing in somewhat degraded bushland in Bolivia and the extreme north of Paraguay.

PARAGUAY. Alto Paraguay: Madrejón, F. Mereles 6696 (FCQ). Boquerón: Fortin Platanillos F. Mereles & R. Degen 6193 (CTES).

BOLIVIA. Santa Cruz: Cordillera, P.N. Kaa-Iya, A. Fuentes & G. Navarro 2319 (CTES, MO, NY, USZ).

Note.

Ipomoea mucronifolia is somewhat similar to Ipomoea pseudocalystegia in its palmately-lobed, softly hirsute, strongly mucronate leaves, combined with the lanceolate, acuminate sepals. It differs in the smaller, more deeply divided, less silvery leaves, the inflorescence of several-flowered cymes and the shorter deciduous bracteoles (up to 7 mm long, not> 20 mm).

Figures

Figure 45. Ipomoea mucronifolia. A habit B leaf C adaxial leaf surface D abaxial leaf surface E outer sepal F inner sepal G corolla opened out to show stamens H stamen J ovary and style. Drawn by Rosemary Wise A, C-J from Wood & Pozo 25064; B from Fuentes & Navarro 2319.