Ipomoea goyazensis Gardner, Hooker

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

148. Ipomoea goyazensis Gardner, Hooker , Icones 5: t. 479. 1842. (Gardner 1842b: t. 479)

Ipomoea decora Meisn. in Martius et al. , Fl. Brasil. 7: 272. 1869. (Meisner 1869: 272). Type. BRAZIL. Goiás, J.B. Pohl 1760 (isotypes K000612854, OXF, W0062252, W0062251, W0062250).

Type.

BRAZIL. Goiás, Serra de Santa Brida, G. Gardner (lectotype Plate 479 in Hook., Icones 5 (1842b), designated by Wood and Scotland 2017a: 2; epitype Gardner s.n., (BM001122231), designated here.

Description.

Twining perennial liana to 6 m; stems rather thin but slightly woody, usually completely glabrous but sometimes appressed pilose or pubescent. Leaves petiolate, 4-12 × 3-10 cm, ovate-deltoid, obtuse and mucronate, both surfaces glabrous or pubescent, adaxially dark green, abaxially very pale with prominent venation; petiole rather short, 1.5-3.5 cm. Inflorescence of subsessile, clustered cymes; peduncles 1-6 mm, glabrous; bracteoles scale-like, caducous; pedicels 0-7 mm, glabrous; sepals subequal, 6-9(-11) mm, elliptic, obtuse to rounded, convex, coriaceous, glabrous, whitish-green when fresh, inner sepals with scarious margins; corolla 5-6 cm long, funnel-shaped, gradually widened from base, glabrous, tube white, limb deep pink, weakly lobed, 2-2.5 cm diam. Capsules (immature), subglobose, glabrous.

Illustration.

Figure 87 .

Distribution.

A characteristic species of the cerrado biome in Brazil and Bolivia; apparently not very common and absent from southern Brazil.

BRAZIL. Sine loc., W.J. Burchell 6656 (K); 6702 (K). Goiás: A. Krapovickas et al. 33131 (CTES); Colinas do Sul, D. Alvarenga et al. 788 (CEN, MO); Hidrolândia, J.F.B. Pastore 3078 (HUEFS). Maranhâo: Mun. Barra do Corda, Schatz et al. 793 (K); G. Gardner 6070 (K, BM). Mato Grosso: Mun. Novo Mundo, W. D. Sasaki et al. 1862 (K). Minas Gerais: Ituiutaba, A. Macedo 1668 (BM, MO). Pará: Tucuruí, T. Plowman et al. 9706 (MG, MO); Marabá, da Silva 1786 (MG, MO). Tocantins: Parque Nacional do Araguaia, Silva et al. 3995 (IBGE, MO, RB); Darcinopolis, G. Pereira-Silva 12956 (CEN).

B OLIVIA. Santa Cruz: Velasco, P.N. Noel Kempff Mercado, T.J. Killeen et al. 5399 (ARIZ, MO); Santa Rosa de la Roca, J.R.I. Wood et al. 27806 (OXF, K, LPB, USZ).

Notes.

When Wood and Scotland designated the lectotype for Ipomoea goyazensis , no specimen could be found in any of the herbaria where Gardner’s specimens were deposited. Subsequently a sheet of the original material collected by Gardner was found at BM (BM001122231), which is here designated as epitype.

A very distinctive species in the field because of its discolourous leaves, very short peduncles and funnel-shaped corolla with a white tube and pink limb. Herbarium specimens are usually easily identified by the subsessile, clustered flowers with coriaceous, convex sepals.

This species is quite variable in indumentum and glabrous (as in the type of I. goyazensis ), pubescent (as in the type of I. decora ) or pilose forms (Pastore 3078) occur.

Figures

Figure 87. Ipomoea goyazensis. A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style. Drawn by Rosemary Wise from Wood et al. 27806.