Ipomoea homotrichoidea 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

163. Ipomoea homotrichoidea O'Donell , Lilloa 14: 173. 1948. ( O’Donell 1948a: 173)

Ipomoea heterotricha var. homotricha Chodat & Hassl., Bull. Herb. Boiss. , ser. 2: 5: 694. 1905. (Chodat and Hassler 1905: 694). Type. PARAGUAY. San Estanislao, Hassler Hassler 4168 (lectotype G00174930, designated here).

Ipomoea heterotricha forma suborbiculata Chodat & Hassl. [as var. homotricha Chodat & Hassl. forma suborbiculata], Bull. Herb. Boiss., ser. 2: 5: 694. 1905. (Chodat and Hassler 1905: 694). Type. PARAGUAY. [San Pedro], San Estanislao, Hassler 6005 (lectotype G00174755, designated here; isolectotypes BM, G).

Ipomoea heterotricha forma dentata Chodat & Hassl. [as var. homotricha Chodat & Hassl. forma dentata], Bull. Herb. Boiss., ser. 2: 5: 694. 1905. (Chodat and Hassler 1905: 694). Type. PARAGUAY. [Cordillera], Piribebuy, Hassler 6708 (lectotype G00174756, designated here).

Ipomoea heterotricha forma subtriloba Chodat & Hassl. [as var. homotricha Chodat & Hassl. forma subtriloba ], Bull. Herb. Boiss., ser. 2: 5: 694. 1905. (Chodat and Hassler 1905: 694). Type. PARAGUAY. [ Canendiyú], Ipé Hú, Hassler 5073 (lectotype G00174927, designated here; isolectotypes BM, G, MPU, NY, P, UC).

Ipomoea heterotricha forma cordifolia Chodat & Hassl. [as var. homotricha Chodat & Hassl. forma cordifolia], Bull. Herb. Boiss., ser. 2: 5: 694. 1905. (Chodat and Hassler 1905: 694). Type. PARAGUAY. [San Pedro], Río Corrientes, E. Hassler 5872 (isotype BM).

Ipomoea bonariensis subsp. aspera Hassl. , Repert. Spec. Nov. Regni Veg. 9: 153. 1911. (Hassler 1911: 153). Type. PARAGUAY. E. Hassler 6708 (lectotype G00174756, designated here).

Ipomoea bonariensis var. pubescens [as subsp. aspera Hassl. var. pubescens ] Hassl., Repert. Spec. Nov. Regni Veg. 9: 154. 1911. (Hassler 1911: 154), nom. illeg. superfl. for I. heterotricha var. homotricha.

Ipomoea bonariensis forma trichosepala [as subsp. aspera Hassl. var. pubescens forma trichosepala] Hassl., Repert. Spec. Nov. Regni Veg. 9: 154. 1911. (Hassler 1911: 154), nom. illeg., based in part on Ipomoea heterotricha forma subtriloba Chodat & Hassl. and in part on Ipomoea bonariensis forma glabrior [as var. grandiflora forma glabrior] Chodat & Hassl. Type. PARAGUAY. E. Hassler 4800 (lectotype G00174931, designated here).

Ipomoea bonariensis var. tomentosa [as subsp. aspera Hassl. var. tomentosa ] Hassl., Repert. Spec. Nov. Regni Veg. 9: 154. 1911. (Hassler 1911: 154). Type. PARAGUAY. San Estanislao, E. Hassler 4168 (lectotype G00174930, designated here).

Ipomoea bonariensis var. hispida [as subsp. aspera Hassl. var. hispida ] Hassl., Repert. Spec. Nov. Regni Veg. 9: 154. 1911. (Hassler 1911: 154). Type. PARAGUAY. E. Hassler 5073 lectotype G00174927, designated here; isolectotypes BM, G, MPU, NY, P, UC).

Ipomoea bonariensis forma subintegra [as subsp. aspera Hassl. var. hispida forma subintegra], Hassl., Repert. Spec. Nov. Regni Veg. 9: 154. 1911. (Hassler 1911: 154), nom. illeg. superfl. Type. Based partially on I. heterotricha forma suborbiculata.

Ipomoea bonariensis forma lobata [as subsp. aspera Hassl. var. hispida forma lobata Hassl. ], Repert. Spec. Nov. Regni Veg. 9: 154. 1911 (1911: 154). Type. PARAGUAY. Caaguazú, Río Yhú, E. Hassler 9535 (lectotype G00174938, designated here; isolectotypes BM, G, K, P).

Type.

PARAGUAY. Amambay, T. Rojas 4051 (holotype LIL001245).

Description.

Decumbent or twining perennial, stems hispid with prominent, relatively long stellate hairs. Leaves petiolate, polymorphic, 3-11 × 2.5-10 cm, ovate to subreniform, entire, obscurely to deeply 3-lobed or lyrate-dentate with acute teeth, apex obtuse, base truncate to narrowly cordate, densely and roughly stellate hairy on both surfaces; petioles 1-5 cm, hispid-stellate-pilose. Inflorescence of 1-3-flowered, pedunculate axillary cymes; peduncles 3-12 cm, hispid-pilose; bracteoles 4 × 1 mm, lanceolate, obtuse, caducous; secondary peduncles 3-17 mm; pedicels short, 3-12 mm, glabrous or nearly so; sepals coriaceous, glabrous or thinly stellate hairy, 8-11 mm long, outer sepals elliptic, obtuse and mucronate, inner sepals obovate, obtuse with scarious margins; corolla 5-9 cm long, pink, funnel-shaped, glabrous, limb 4-5 cm diam., unlobed; ovary glabrous. Capsules and seeds not seen.

Distribution.

Nearly endemic to eastern Paraguay with a single record from a neighbouring area of Brazil.

PARAGUAY. Amambay: Pedro Juan Caballero, Krapovickas et al. 45909 (K, CTES); ibid., A. Schinini et al. 36021 (PY). Caaguazú: Yhú, Jorgensen 4858 (S, SI, US). Canindeyú: Yerbales de Maracayú, Río Carimbatay, Hassler 4539 (P). Paraguarí: P.N. Ybicu’í, E. Zardini and R. Velazquez 15895 (MO, PY). San Pedro: 5 km SW de San Estanislao, camino a Rosario, Krapovickas et al. 45822 (K, CTES).

BRAZIL. Paraná: Cordeiro et al. 4701 (MBM).

Note.

Clearly related to Ipomoea bonariensis , this species was treated as a synonym of that species by Austin et al. (2015) but is readily distinguished by the relatively long (0.5-1.5 mm) arms of the branched hairs, Even more than I. bonariensis , it shows an extraordinary range of leaf shape, entire, merely dentate to laciniate or 3-lobed. It occurs in scattered locations in eastern Paraguay and neighbouring parts of Paraná State in Brazil.