Ipomoea granulosa Chodat & Hassl.

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

368. Ipomoea granulosa Chodat & Hassl. , Bull. Herb. Boiss., ser. 2, 5: 687. 1905. (Chodat and Hassler 1905: 687)

Ipomoea stenophylla forma glabrata Chodat & Hassl., Bull. Herb. Boiss., ser. 2, 5: 690.1905. (Chodat and Hassler 1905: 690). Type. PARAGUAY. [ Canendiyú], Ipé hu [ Ypé Jhu], Sierra de Maracayú: E. Hassler 5023 (isotypes BM, G, NY).

Type.

PARAGUAY. [ Canendiyú], Ipe hú [ Ypé Jhu], Sierra de Maracayú, E. Hassler 5045 (holotype G00175177, isotypes BM, F, GH, K, MPU, NY, P).

Description.

Undershrub from a xylopodium; stems erect, slender, wiry and somewhat woody, pale brown, glabrous, granulose, 10-15 cm high. Leaves subsessile, imbricate, 4-11.5 × 0.3-2.2 cm, linear, oblong or ovate, acute and mucronate, base tapering, cuneate, truncate to subcordate, glabrous, abaxially veins prominent; petioles 2-3 mm. Inflorescence of solitary axillary flowers; peduncles 0-2 mm, almost suppressed; bracteoles caducous, ovate, c. 1 mm; pedicels 4-10 mm, slightly thickened upwards, sometimes granulose; sepals slightly unequal, ovate, acute, (obtuse and mucronate in type), outer 10-14 × 3-6 mm, inner 13-16 × 8 mm, broader and slightly longer, margins scarious; corolla 6-8 cm long, pink, funnel-shaped, glabrous, limb 3-4.5 cm, the midpetaline bands ending in a small tooth. Capsules (immature), ovoid, apiculate, glabrous; seeds not seen.

Distribution.

Cerrados of eastern Paraguay and central Brazil.

PARAGUAY. Canendiyú: Mbaracayú Natural Reserve, Aguará ñu, E. Zardini & S. Benítez 51141 (ARIZ); ibid., E. Zardini & S. Benítez 51445 (ARIZ). Amambay: Sierra de Amambay, T. Rojas in Hassler 9826 (BM, K, P); P.N. Cerro Corá, I. Basualdo 4876 (FCQ, MO); Pedro Juan Caballero, A. Krapovickas et al. 45900 (CTES, K); ibid., G. Hatschbach 48501 (ARIZ, MBM, MO). Concepción: San Luis, A. Schinini et al. 35866 (CTES).

BRAZIL. Mato Grosso do Sul: 22 km de Ponta Porã para Antonio João, G. Hatschbach et al. 59080 (MBM). Minas Gerais: Serra do Cipo, M.M. Arbo et al. 4627 (CTES, FTG, SPF); ibid., Santana do Riacho, D.C. Zappi et al. 1531 (K); Pirapama, D.C. Zappi et al. 1999 (K); Presidente Joscelino, V. C. Souza CFRC13928 (K); Santana do Riacho, A. Costa (RB); ibid., A. Rapini et al. 1627 (HUEFS, OXF).

Notes.

Extraordinarily variable in terms of leaf shape (linear to ovate) and leaf size (3-4 cm long v.> 10 cm) as also in sepal size (6-7 mm v. 13-15 mm) and apex (finely acuminate to rounded). However the differences are not geographically marked and each of the three populations is variable within itself. The species is held together by the combination of granulose stems, subsessile imbricate leaves, very short peduncles, slightly unequal sepals and glabrous corollas. Molecular studies suggest this species is very closely related to and perhaps not distinct from Ipomoea rupestris .

Hassler 5023a from Ipé hu, Sierra de Maracayú is a different species with thinly pubescent corolla, stems, peduncles and sepals. The stems are not granulose and at least one leaf is forked. It is probably a form of Ipomoea campestris Meisn.