Ipomoea uninervis

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

48. Ipomoea uninervis J.R.I. Wood & Scotland, Phytokeys 88: 28. 2017. (Wood et al. 2017d: 28)

Type.

BRAZIL. Distrito Federal, próximo ao posto Colorado Chacara FTRC, Centro Oeste, 15°41'S, 47°52'W, 6 Feb. 1999, C. Proença, R.S. Oliveira, C.M. Clemente, J.F. Ribeiro 2074 (holotype UB8208-2, isotype E).

Description.

Perennial undershrub; stems erect, to 1.2 m, sparingly branched, grey-puberulent to subsericeous. Leaves subsessile, 4-12 × 0.1-0.5 cm, linear to narrowly oblong, obtuse, shortly mucronate, both surfaces grey-puberulent to subsericeous, abaxaially paler with one prominent longitudinal vein; petioles 0-3 mm, tomentellous. Inflorescence of few-flowered cymes from the upper leaf-axils, forming a terminal usually elongate inflorescence up to 15 cm in length; bracts formed of reduced leaves, caducous so inflorescence appearing naked; peduncles 1-4 mm, grey-tomentellous; bracteoles 1.5 mm, linear, tomentellous, caducous; pedicels 3-7 mm, grey-tomentellous; sepals subequal, 7.5-8 × 3-4 mm, broadly oblong, obtuse to rounded, grey-tomentose, the inner with broad glabrous, scarious margins; corolla c. 4.5 cm long, pink, pubescent, funnel-shaped; limb c. 4 cm diam.; ovary conical. Capsules and seeds not seen.

Illustration.

Figure 35 .

Distribution.

Endemic to the Distrito Federal and Goiás State in Brazil, where it appears to be a rare species of cerrado.

BRAZIL. Dist. Fed.: type collection. Goiás: Cristalina, 5 km along estrada para Paracatu, 16°46'S, 47°37'W, 1050 m, J.R. Pirani et al. 1560 (SPF, K).

Note.

Ipomoea uninervis appears close to I. aprica but differs in the grey-tomentellous, oblong outer sepals 7.5-8 mm long (these are green-tomentose, broadly ovate to suborbicular and 5-6 mm long in I. aprica ) and the elongate inflorescence with deciduous bracts so appearing naked (not leafy with persistent bracts). It is also close to Ipomoea oblongifolia but differs in the 1-veined leaves and oblong, not elliptic bracts and relatively long inflorescence.

Figures

Figure 35. Ipomoea uninervis. A habit B abaxial leaf C outer sepal D inner sepal E corolla opened out to show stamens F ovary and base of style. Drawn by Rosemary Wise from C. Proenca et al. 2074.