Ipomoea graniticola

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

89. Ipomoea graniticola J.R.I. Wood & Scotland, Kew Bull. 70 (31): 67. 2015. (Wood et al. 2015: 67)

Type.

BOLIVIA. Santa Cruz, Ñuflo de Chávez, El Cerrito, J.R.I. Wood, D. Villarroel & S. Renvoize 25750 (holotype USZ isotypes K, LPB, UB).

Description.

Twining perennial to 2 m, completely glabrous in all vegetative parts; stems slender, trailing or twining; rootstock tuberous. Leaves petiolate, divided into 5 separate leaflets, base ± truncate, leaflets 1.2-3 × 0.2-0.6 cm, attenuate at both ends, apex acute, the basal pair narrowly oblong, the remaining three narrowly oblong-elliptic; petiole 1.2-1.5 cm, commonly straight. Inflorescence of 1-2-flowered, axillary, pedunculate cymes; peduncles slender, 2.5-5 cm; secondary peduncles c. 1.5 cm; bracteoles 1.5 × 0.5 mm, strap-shaped, obtuse, early caducous; pedicels 1.1-2 mm; sepals equal, 7-8 × 3.5 mm, broadly oblong, rounded, margins broad, scarious; corolla 6-7 cm long, pink, glabrous, funnel-shaped, limb 5-6 cm, unlobed, stamens included, stigma obscurely bilobed. Capsules 8 × 6 mm, obovoid, conspicuously 5-lobed, glabrous; seeds 4.5 × 3 mm, ± ovoid, pale brown, with deciduous white marginal hairs c. 3 mm in length.

Illustration.

Figure 57 .

Distribution.

Grows amongst Bromeliads in patches of vegetation on isolated granite inselbergs in eastern Bolivia, northern Paraguay and Brazil.

PARAGUAY. Alto Paraguay: Cerro León, F. Mereles 6632 (CTES, FCQ).

BRAZIL. Ceará: Mun. Granja, Terezinha, São Miguel, E.B. Souza et al. 3395 (HUVA, PEUFR). Mato Grosso: São João da Barra, N.A. Rosa & M.R. Santos 2089 (MG, MO, RB).

BOLIVIA. Santa Cruz: Ñuflo de Chávez; El Cerrito J.R.I. Wood et al. 24991 (K, LPB, UB, USZ); J.R.I. Wood et al. 27763 (OXF, LPB, USZ); Montecristo, J.R.I. Wood et al. 27996 (LPB, OXF, USZ).

Notes.

This species is related to Ipomoea rosea Choisy from NE Brazil differing in the leaves with five narrowly oblong leaflets and in the absence of a tooth-like appendage on the abaxial surface of the sepals. It has been confused with I. subrevoluta but differs in the larger obtuse to rounded sepals and grows in a quite different habitat.

The Paraguay specimen resembles Ipomoea graniticola in every way except for the presence of an appendage on the abaxial surface of the outer sepals.

Figures

Figure 57. A-H Ipomoea graniticola. A habit B stem C outer sepal D inner sepal E corolla opened out to show stamens F ovary and style G shoot with fruiting inflorescence showing capsule H seeds. J-L Ipomoea subrevoluta. J inflorescence K outer sepal L inner sepal. Drawn by Rosemary Wise A-F from Wood et al. 27763; G, H from Wood et al. 24991; J-L from Wood et al. 27790.