Ipomoea longibarbis

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

70. Ipomoea longibarbis J.R.I. Wood & Scotland, Kew Bull. 50 (31): 56. 2015. (Wood et al. 2015: 56)

Type.

BOLIVIA. Santa Cruz, Prov. Cordillera, Pie de la Muela del Diablo, Boyuibe-Camiri, J.R.I. Wood, D. Villarroel & B. Williams 27633 (holotype USZ, isotypes OXF, K, LPB).

Description.

Robust twining perennial usually 2-5 m high, stems pubescent, somewhat woody. Leaves petiolate, 4-13 × 3-12 cm, ovate, acute or shortly acuminate, terminating in a fine hair point, base shallowly cordate to truncate, margin slightly undulate, adaxially green, thinly adpressed-pubescent, abaxially grey, densely pubescent; petioles 3-10 cm, pubescent. Inflorescence of pedunculate axillary cymes with 1-8 flowers, somewhat dense; peduncle 4.5-26 cm, usually rather stout, pubescent; lower bracteoles 2-2.5 × 0.2-0.8 cm, oblong to oblong-elliptic; secondary peduncles 1.5-4 cm; upper bracteoles 9-18 × 1 mm, linear-lanceolate, terminating in a long fine point, pubescent, somewhat persistent; pedicels 2-10 mm, pubescent; sepals slightly unequal, outer 11-16 × 6-7 mm, ovate, acuminate to a fine point, grey-pilose with conspicuous spreading hairs, inner ovate-elliptic, acute, silvery-pilose with hairs weakly spreading; corolla c. 8 cm long, uniformly pink, silky pubescent on the exterior, funnel-shaped, limb 5 cm diam., shallowly-lobed. Capsules 10-11 × 10 mm, ovoid, glabrous; seeds 7 × 3-3.5 mm, brown, glabrous apart from the 10 mmlong white marginal hairs.

Illustration.

Figures 11E , 47A-H .

Distribution.

Endemic to Bolivia, growing in dry chaco scrub woodland along the Andean foothills from Camiri south to the Villamontes area, between 500 and 1500 m, largely replacing Ipomoea argentinica in this region.

BOLIVIA. Chuquisaca: Boeto, Río Grande valley, J.R.I. Wood 28128 (LPB, OXF, USZ); Calvo, 80 km E of Boyuibe, T. Killeen, et al. 4199 (MO); Siles, between Monteagudo and Rosario del Ingre, M. Serrano 2087 (HSB). Santa Cruz: Cordillera, SE of Salinas, M. Nee & I. Linneo 54148 (MO, NY, USZ); between Camiri and Boyuibe, M. Mendoza et al. 2765 (K, LPB, USZ). Tarija: Gran Chaco, cañón del Río Pilcomayo, J.R.I. Wood et al. 27593 (OXF, K, LPB, USZ); O’Connor, Alta de Soledad, F. Zenteno et al. 4357 (LPB).

Note.

Similar to Ipomoea argentinica in habit and leaf indumentum but differing in the laxer inflorescence with longer peduncles, broader outer sepals with conspicuous speading hairs and less persistent bracteoles. Herbarium specimens resemble Ipomoea rubens very closely in facies and indumentum but molecular studies indicate there is no close affinity. Ipomoea longibarbis is a plant of dry habitats, not stream banks.

Figures

Figure 11. Seeds of Ipomoea A I. peteri B I. murucoides C I. carolina D I. eggersiana E I. longibarbis (with and without marginal hairs) F I. clavata G I. violacea H I. acanthocarpa J I. parvibracteolata K I. meyeri L I. jujuyensis M I. cholulensis N I. minutiflora P I. tiliacea. A from Wallnoefer & Tut-Tesucun 9662; B from Pringle 6066; C from Gillis 12906; D from Urote 35; E from Killeen et al. 4199; F from Fuentes & Miranda 10895; G from Stearn 322; H from Wurdack & Monachino 39830; J from Silva et al. 18; K from Smith 1573; L from Rose et al. 23251; M from Hinton 11166; N from Stevens & Montiel 26592; P from Curtiss 249. Drawn by Rosemary Wise.

Figure 47. A-H Ipomoea longibarbis. A habit B abaxial leaf surface C bracteole D outer sepal E inner sepal F section of corolla showing 3 stamens, ovary and style G fruiting inflorescence H seed. J-P Ipomoea argentinica J inflorescence K abaxial leaf surface L bracteole M outer sepal N inner sepal P ovary and style. Drawn by Rosemary Wise A-F from Nee & Linneo 54148; G, H from Killeen et al. 4199; J-P from Wood & Mamani 27502.