Ipomoea pseudocalystegia 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

68. Ipomoea pseudocalystegia Hassl. , Repert. Spec. Nov. 9: 151. 1911. (Hassler 1911: 151)

Type.

PARAGUAY. Sierra de Amambay, Rojas in Hassler 10723 (holotype G00175048, isotypes BM, K).

Description.

Trailing perennial, the whole plant densely sericeous-pilose, often silvery in colour; rootstock unknown but probably woody. Leaves petiolate, 3.5-13 × 2.5-15 cm, usually weakly 3-5-palmately lobed,(sometimes entire, broadly ovate), base broadly cuneate to subtruncate, lobes oblong-deltoid, the laterals often poorly developed, apex obtuse and mucronate; petioles 2-12 cm. Inflorescence of long-pedunculate solitary or clustered, axillary flowers; peduncles 5-20 cm; bracteoles 1.5-2.5 cm long, usually filiform but sometimes lanceolate (to 4 mm wide) or, even, as in type, foliose, spathulate-elliptic, reaching 5 × 1.5 cm; pedicels 1-8 mm, the hairs more patent than on peduncle; sepals lanceolate, long-acuminate, 18-25 × 3-5 mm; corolla 7-10 cm long, pink, funnel-shaped, pilose, limb undulate, 3-4 cm diam. Capsules and seeds not seen.

Illustration.

Figure 46 .

Distribution.

A local species endemic to the Sierra de Amambay in Paraguay and neighbouring parts of Rio Grande do Sul in Brazil, apparently always growing in cerrado. PARAGUAY. Amambay: Rojas in Hassler 10620 (BM); K. Mizoguchi & T. Sano 1139 (MO); Chiriguelo, A. Schinini & M. Dematteis 33482 (CTES, FCQ), 33647 (FCQ, CTES); Krapovickas et al. 45907 (CTES, K); Cerro Corá, Krapovickas & Cristóbal 44958 (CTES, F, FCQ); ibid., N. Soria 5740 (CTES, FCQ); ibid., N. Soria & E. Zardini 1952 (FCQ). San Pedro: Rancho Laguna Blanca, F. González & M.J. López 757 (FCQ), 817 (FCQ), Yaguarete Sustainable Forest, E. Zardini & L. Guerrero 43282 (MO, PY).

BRAZIL. Rio Grande do Sul: Pacari, Mun. Ponta Porã, G. Hatschbach 45924 (MBM).

Note.

Hassler 5009 (NY, F, G, K, P) from Canindeyú (Nandurucay, Sierra de Maracayu), differs slightly in its less silvery appearance with leaf lobes oblong-lanceolate in shape. Krapovickas & Cristóbal 44958 (CTES, F, FCQ) from P.N. Cerro Corá, Amambay, appears identical to Ipomoea pseudocalystegia in its inflorescence but the leaves are 3-lobed to half way, the central lobe broadly elliptic and base truncate and very shortly cuneate onto the petiole. Further collections are needed to elucidate these forms.

Figures

Figure 46. Ipomoea pseudocalystegia. A habit B variation in leaf shape C adaxial leaf surface D abaxial leaf surface E bracteole and calyx. Drawn by Rosemary Wise A, C-E from Hassler 10723; B from Hassler 10620.