Ipomoea morongii Britton in Morong, T. & Britton, N.L.

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

10. Ipomoea morongii Britton in Morong, T. & Britton, N.L. , Ann. New York Acad. Sc. 7: 171. 1892. (Morong and Britton 1892: 171)

Ipomoea malvaeoides var. trifida Hallier f., Bull. Herb. Boiss. 7 (5), append. 1: 52. 1899. (Hallier 1899b: 52). Type. PARAGUAY. Cordillera de los Altos, E. Hassler 1938 (lectotype G00174972, designated here).

Ipomoea malvaeoides var. heterophylla Hallier f., Bull. Herb. Boiss. 7 (5), append. 1: 52. 1899. (Hallier 1899b: 52). Type. PARAGUAY. [Cordillera], San Bernardino, E. Hassler 1796 (lectotype G00174971, designated here).

Ipomoea malvaeoides forma intermedia Chodat & Hassl. [as var. heterophylla forma intermedia ], Bull. Herb. Boiss., ser. 2, 5: 690. 1905. (Chodat and Hassler 1905b: 690). Type. PARAGUAY. Cordillera de Los Altos, E. Hassler 3456 (lectotype G00174963, designated here; isolectotypes G).

Type.

PARAGUAY. [Central], Luque, T. Morong 303 (holotype NY00319204, isotypes GH, MO, PH, US, WIS).

Description.

Erect undershrub to 1.2 m, stems below woody, glabrous, reddish above herbaceous, densely puberulent. Leaves petiolate, lower leaves 9-10 × 2-4 cm, entire, ovate obtuse to acute and mucronate, base cuneate, upper leaves (2-)3-lobed with the laterals much shorter than the central lobe which is usually lanceolate, acuminate, the uppermost leaves noticeably smaller and with narrower lobes, both surfaces finely tomentellous, abaxially paler; petioles1-2.5 cm, puberulent. Inflorescence of shortly pedunculate cymes from the upper leaf axils; peduncles 2-4 (-9) cm, puberulent; bracteoles 3-4 × 1 mm, oblong-lanceolate, caducous; secondary peduncles 0.7-1.8 cm; pedicels 6-10 mm, puberulent; sepals subequal, tomentellous, outer 7-9 × 5-6 mm, ovate, acute to obtuse, inner similar but with scarious, less hirsute margins; corolla 4.5-6.5 cm long, pink, pubescent, funnel-shaped; limb 3-5 cm diam., entire. Capsules and seeds not seen.

Illustration.

Figures 16 , 17B .

Distribution.

Endemic to the area around Lago Ypacaraí in Central and Cordillera departments in eastern Paraguay.

PARAGUAY. Central: Ypacaraí, E. Hassler in Rojas 11473 (BM, K, NY). Cordillera: Emboscada, I. Basualdo 1021 (CTES, FCQ); Emboscada hacia Nueva Colombia, R. Degen 1385 (CTES, FCQ); Nueva Colombia, J.R.I. Wood et al. 28147 (FCQ); costa del Lago Ypacaraí, C. Quarin et al. 1488 (CTES); San Bernardino, E. Hassler 3307 (P), T. Rojas 1694 (LIL, SI), T. Rojas 14136 (SCP).

Typification.

Ipomoea morongii is heterophyllous on the same plant with some leaves entire and some trifurcate. In lectotypifying the synonyms of Ipomoea morongii , we have endeavoured to choose specimens which show heterophylly and at least some trifurcate leaves. G00174972 is the only specimen at G annotated trifida by Hallier, although he also, confusingly, annotated it as I. heterophylla . The portion in the envelope which is clearly trifid should be treated as the lectotype in the event of any dispute. The specimen G00174971 of Hassler 1796 is designated as the lectotype of Ipomoea malvaeoides var. heterophylla because it has some trifurcate leaves even though it was not annotated by Hallier.

Note.

Although this species is clearly closely related to I. malvaeoides and could possibly be treated as a variety of it, it is usually easily distinguished by the trifurcate tomentose stem leaves with broad segments conspicuously fused in their lower half. The type is less hairy than most specimens.

Figures

Figure 16. A-D Ipomoea malvaeoides. A habit B abaxial leaf surface C seed D leaves (var. lineariloba). E-J Ipomoea morongii. E habit F outer sepal G inner sepal H corolla opened out to show stamens J ovary and style. Drawn by Rosemary Wise A, B from Krapovickas et al. 412477; C from Schinini 30429; D from St. Hilaire 2703, E-J from Hassler 3307.

Figure 17. Photographs of Ipomoea species. A I. haenkeana B I. morongii C I. malvaeoides D I. hieronymi. A John Wood; B, C Tom Carruthers; D Keith Ferguson.