Ipomoea pantanalensis

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

377. Ipomoea pantanalensis J.R.I. Wood & C. Urbanetz, Kew Bull. 71 (6): 2. 2016. (Wood et al. 2016a: 2)

Type.

BRAZIL. Mato Grosso do Sul, Mun. Corumbá, Fazenda Nhumirim, caminho para o Caronal, Nhecolandia, 90 m, 18°59'S, 56°39'W, 31 Jan. 1990, A. Pott & O.C. de Souza 5475 (holotype CPAP, isotypes MBM, SP).

Description.

Slender herb, probably perennial; stems sometimes creeping and rooting at the nodes, sometimes ascending and twining up to c. 30 cm, glabrous. Leaves petiolate, sometimes dimorphic; petioles 0.8-3 cm, glabrous or with a few scattered hairs; lamina glabrous or thinly pubescent, abaxially pale green, base cuneate, occasionally ovate-deltoid, 1 -5.6 × 1.7-4.5 cm, acute, more commonly digitately 3-5-lobed to near the base with lobes 1-4.8 × 0.1-0.6 cm, linear or lanceolate, acute. Inflorescence of solitary axillary flowers; peduncles 1-3 cm; bracteoles persistent, 4 × 0.5 mm, ciliate; pedicels 1-3 cm, often dark red, thinly pilose; sepals very unequal, outer sepals 15-24 × 3-6 mm, deltoid, acute to shortly mucronate, base truncate with a simple or notched lateral tooth, margin ciliate, inner sepals 10-18 × 3-4 mm, similar in shape but lacking the distinct lateral teeth, abaxially pubescent in the central area, margins glabrous; corolla 3.8-5.5 cm long, pink, funnel-shaped, glabrous; limb c. 2.5 cm diam., the lobes apiculate; stamens included; ovary glabrous. Capsules and seeds not seen.

Illustration.

Figures 3F , 182 .

Distribution.

Known certainly from a few collections from the Corumbá region but perhaps also in Piauí.

BRAZIL. Mato Grosso do Sul: A. Pott et al. 6399 (CPAP, K).

Notes.

Very distinctive when both leaf forms present but also easily distinguished by the truncate base of the outer sepals.

A specimen from Piauí, Castelo do Piauí, J.M. Costa & D.P. Coutinho 204 (HUEFS, TEPB) appears to belong to this species. It is described as a creeping herb and has the same distinctive sepals but differs in the broader, oblong-elliptic, more hirsute leaf lobes. Without further collections it is impossible to say whether this is a distinct species or merely a form of Ipomoea pantanalensis .

Figures

Figure 3. Sepals of Ipomoea species. A I. pauciflora B I. bernoulliana C I. tentaculifera D I. hartwegii E I. murucoides F I. pantanalensis G I. hederacea H I. funis. Photographs of A (Harling et al. 15403) B (Standley 27496) C (Pringle 6702) D (Santos Martinez 2228 E (Pringle 6066) F (Pott 6399) G (McCarthy s. n.) H Andrieux 600 by John Baker.

Figure 182. Ipomoea pantanalensis. A habit B peduncle with bracteoles C outer sepal D inner sepal E ovary & style F corolla opened up to show stamens. Drawn by Rosemary Wise from A. Pott et al. 6399.