Ipomoea amazonica (D.F. Austin & Staples)

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

353. Ipomoea amazonica (D.F. Austin & Staples) J.R.I. Wood & Scotland, Kew Bull. 70 (31): 27. 2015. (Wood et al. 2015: 27)

Turbina amazonica D.F. Austin & Staples , Bull. Torrey Bot. Club 118: 270. 1991. (Austin and Staples 1991: 270).

Calystegia glaziovii Dammer. , Bot. Jahrb. Syst. 23 (5), Beibl. 57: 41. 1897. (Dammer 1897: 41), non Ipomoea glaziovii Dammer (1897) . Type. BRAZIL. "environs de Rio Janeiro", A.F.M. Glaziou 13009 (isotypes K00612827, P).

Type.

BRAZIL. Amapá. D.F. Austin, C.E. Nauman, B. Rabelo, C. Rosario & M.R. Santos 7389 (holotype MG; isotypes FAU, now in FTG, NY, MO, US).

Description.

Twining perennial, stem tomentose. Leaves petiolate, 3.5-9 × 3-7 cm, ovate-deltoid, obtuse and mucronate, base cordate with narrow sinus and rounded auricles, margin slightly undulate, softly tomentose on both surfaces, abaxially grey; petioles 1-2 cm, tomentose. Inflorescence a dense cluster of up to 10 flowers at apex of a long peduncle; peduncles 3-10 cm, tomentose; bracteoles 5-18 × 2-4 mm, ovate-rhomboid, tomentose, persistent; pedicels 5-10 mm; sepals tomentellous, accrescent in fruit, unequal, outer 8-12 × 5-8 mm, oblong-ovate, acute, base subcordate, inner 5-8 mm, oblong-ovate with broad scarious margins; corolla magenta, 5-6 cm long, funnel-shaped, glabrous except for a few hairs at apex of midpetaline bands in bud, limb c. 3 cm diam. Capsules 10-15 × 4-5 mm, ovoid, glabrous; seeds reported as usually one, oblong-ellipsoid, c. 10 mm long.

Illustration.

Austin and Staples (1991: 271).

Distribution.

A rare species of seasonally flooded lowland areas in the Amazon basin in Bolivia, Brazil and Colombia. It may be more common in the Amazonian regions of both Bolivia and Brazil than the few collections suggest.

BRAZIL. Amapá: N.A. Rosa & M.R. Santos 4309 (MG, NY); 12 km NE of Macapá, D.F. Austin 7389 (RB). Amazonas: Mun. Humaitá, L.O.A. Teixeira et al. 1329 (MO, NY, RB). Mato Grosso: Barra do Garças-Xavantina road, D.R. Hunt & Ferreira Ramos 5946 (K); Rio Suia Missú, c. 20 km N of ferry and 50 km NNW of base camp, R.M. Harley & R. Souza 11139 (K, P). Pará: Santarém, Spruce (K). Rondônia: G. Prance et al. 5966 (MG, NY).

BOLIVIA. La Paz: Iturralde, NE of confluence of Río Madidi with Río Inambari, B.M. Torke et al. 540 (LPB). Pando: Abuna, Río Negro confluence with Río Abuna, A. Gentry & A. Perry 77997 (MO, LPB). Federico Román, L. Vargas et al. 980 (F). Santa Cruz: Velasco, Campos de San Ramón, S.R.P. Halloy et al. 4291 (NY); PNNKM, Lago Caimán, N. Ritter et al. 4348 (MO).

COLOMBIA. Vaupés: Río Kubiyú, J.L. Zarucchi 1429 (K, COL, GH).

Note.

Very distinctive because of its rather small velvety leaves and oblong-cordate velvety sepals and persistent bracteoles.