Ipomoea oblongifolia (Hassl.) O'Donell

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

49. Ipomoea oblongifolia (Hassl.) O'Donell , Lilloa 23: 493. 1950. ( O’Donell 1950b: 493)

Ipomoea argyreia var. lanata Hassl. , Repert. Spec. Nov. Regni Veg. 9: 196. 1911. (Hassler 1911: 196). Type. PARAGUAY. Sierra de Amambay, Punta Porá, T. Rojas in Hassler 9821, (lectotype G00175126, designated here; isolectotypes BM, F, G, K, LIL, MPU, P).

Ipomoea argyreia forma oblongifolia Hassl. [as var. lanata forma oblongifolia ], Repert. Spec. Nov. Regni Veg. 9: 196. 1911. (Hassler 1911: 196). Type. PARAGUAY. Sierra de Amambay, Punta Porá, T. Rojas in Hassler 9821, (lectotype G00175126, designated here; isolectotypes BM, F, G, LIL, MPU).

Ipomoea argyreia forma linearifolia Hassl. (as var. lanata forma linearifolia ], Repert. Spec. Nov. Regni Veg. 9: 196. 1911 (Hassler 1911: 196). Type. PARAGUAY. Sierra de Amambay, Punta Porá, E. Hassler 9821b (lectotype G00228031, designated here; isolectotype BM, MPU).

Type.

Based on Ipomoea argyreia forma oblongifolia Hassl.

Description.

Erect perennial herb or subshrub from a xylopodium; stems to 0.75 cm, unbranched or branched at the base, yellow-brown, woody and glabrous below, pubescent above. Leaves subsessile, 3-12 × 0.5-1.2 cm, oblong, base cuneate, apex obtuse and strongly mucronate with a deflexed falcate tip, shortly floccose on both surfaces, adaxially grey-green, abaxially paler, prominently 3-5-veined; petioles 0-2 mm. Inflorescence terminal, compact and subcapitate, 3-5 cm long, composed of 1-3-flowered subsessile cymes; bracts rarely present, linear, foliose, <1.5 cm long, peduncles 2 mm, white-tomentose; bracteoles 2 × 1 mm, obovate, retuse, papery, caducous; pedicels 4-5 mm, denselytomentose; sepals subequal, 7-7.5 × 7 mm, suborbicular to broadly elliptic, rounded, densely white tomentose; corolla 4-5 cm long, pink, broadly funnel-shaped, pubescent, limb 5 cm diam., unlobed.

Distribution.

Endemic to the Sierra de Amambay.

PARAGUAY. Amambay: Alredores de P.J. Cabellero, camino a Cerro Corá, A. Schinini et al. 36029 (CTES, PY); ibid., Ruta 5, A. Krapovickas & C. Cristóbal 44964 (CTES).

Note.

The oblong, shortly floccose, abaxially prominently veined leaves with deflexed mucronate apex, compact terminal inflorescence with tomentose suborbicular sepals are distinctive.