Ipomoea leprieurii D.F. Austin

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

385. Ipomoea leprieurii D.F. Austin , Acta Amazonica 11 (2): 291 1981. (Austin 1981: 291)

Merremia linearifolia Hallier f., Jahrb. Hamburg. Wiss. Anst. 16, Beiheft 3: 36. 1899. (Hallier 1899b: 36), non Ipomoea linearifolia Hook. (1847) . Type. FRENCH GUIANA. F.M.R. Leprieur s.n. (isotype G00227883).

Type.

Based on Merremia linearifolia Hallier f.

Description.

Erect or decumbent perennial from an often somewhat tufted woody rootstock with several stems from base, stems glabrous or obscurely pubescent, sometimes rooting at the nodes. Leaves petiolate, 4-12 × 0.2-0.7 cm, linear or linear-lanceolate, finely acuminate, acute, apiculate, base cuneate to subrounded, glabrous; petioles 0.5-2.5 cm long, glabrous to sparsely pilose. Inflorescence of solitary (rarely paired) flowers from the uppermost leaf axils, or apparently terminal; peduncles 0.5-4 cm; bracteoles filiform, 2-5 mm; pedicels 7-10 mm; sepals subequal, 4-7 mm long, lanceolate, finely acuminate, glabrous, margins scarious; corolla 3-4 cm long, pink, funnel-shaped from pale tube 10-15 mm long, glabrous, limb c. 3 cm diam. unlobed but toothed at tips of midpetaline bands. Capsules 7-8 mm, glabrous, globose, usually 2-seeded; seeds 4.5 × 3 mm, minutely pubescent.

Distribution.

French Guiana and Amapá State in Brazil. On granite outcrops and inselbergs in savanna.

BRAZIL. Amapá: Cidade da Pedras, Vila Porto Grande, D.F. Austin et al. 7089 (FTG, MG, MO, NY RB); 2 km de acampamento, Montanha de Pedra. D.F. Austin et al. 7342 (FTG. MG, NY); Rio Araguari, J.M. Pires et al. 50968 (NY, FTG); 14 km SSE of Oiapogue, D.C. Daly & J. Cardoso 3805 (NY, MG, FTG); Rio Oiapoque, granite outcrop, W.A. Egler 47645 (MG, FTG).

FRENCH GUIANA. Inselberg Mont Chauve, J.F. Villiers & C. Sarthou 6095 (P); Fleuve Oyapock, Oldeman 2569 (P); Mont. des Mouragues, C. Sarthou 229 (FTG); Savanne de Virginie, Mataroni River, S.A. Mori et al. 25290 (ARIZ, NY); Roche Touatou, Bassin de l’Aoyapock, J.J. Granville & G. Cremers 12965 (CAY, K, OXF).

Note.

A very unusual species because of the finely acuminate, linear to linear-lanceolate leaves, subequal, lanceolate filiform sepals and glabrous corolla. The placement of this species is uncertain.