Ipomoea cavalcantei 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

96. Ipomoea cavalcantei D.F. Austin , Acta Amazonica 11 (2): 292. 1981. (Austin 1981: 292)

Type.

BRAZIL. Pará. Marabá, Serra dos Carajas, 6°00'S, 50°18'W, 700 m, 21 May 1969, P. Cavalcante 2086 (holotype MG36666, isotype F).

Description.

Scrambling shrub to 1.5 m; stems woody, pubescent when young but glabrescent. Leaves shortly petiolate, 5-10 × 1-2.5 cm, oblong, apex obtuse, shortly mucronate, base broadly cuneate, adaxially shortly pubescent, abaxially paler, the veins highlighted with pale dense pubescence, the intercostal areas nearly glabrous; petioles 0.4-1.5 cm, pubescent. Inflorescence elongate, formed of 1-5-flowered cymes in the leaf axils; peduncles 5-10 mm, pubescent; bracteoles caducous, subulate, c. 2 mm long; secondary peduncles 3-4 mm, often absent; pedicels 5-18 mm, less pubescent than peduncles; sepals subequal, 10-12 × 5 mm, oblong-elliptic, mucronate, outer, densely pubescent esp. towards apex, inner similar but with broad, glabrous margins; corolla vermillion, pubescent esp. on midpetaline bands, hypocrateriform, basal tube 3-3.2 cm long, 3-4 mm wide at base, 6 mm above, limb spreading, c. 3 cm diam., unlobed but midpetaline bands ending in hairy point, stamens exserted, anthers narrowly oblong c. 3.5 mm. Capsules and seeds not seen.

Illustration.

Figure 62 .

Distribution.

Endemic to NE Brazil, growing in scrub around rock outcrops principally on or near the Serra de Carajás.

BRAZIL. Pará: Serra de Carajás, M.G. Silva & R. Bahia 2911 MG, FTG, RB); ibid., Serra Norte, P. Cavalcante & M. Silva 2651 (MG); ibid., C.R. Sperling et al. 5584 (MO); ibid., H.C. de Lima 7099 (RB); Mun. Itaituba, estrada Santarém-Cuiabá, BR 163, km 816, Serra do Cachimbo, I.L. Amaral et al. 1028, (FTG). Tocantins: Mun. Tocantinopolis, Ribeiro do Corrego, along Belem-Brasilia highway, T. Plowman et al. 9250 (MG, FTG).

Notes. The erect habit, oblong, shortly petiolate leaves combined with the hypocrateriform vermilion corolla make this species very distinct.

A hybrid between this species and Ipomoea marabaensis is recorded and illustrated by Simão-Bianchini et al. (2016: 1311).

Figures

Figure 62. Ipomoea cavalcantei A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style F corolla G calyx in fruit. Drawn by Rosemary Wise A-C G from Sperling et al. 5584; D, E from dos Santos et al. 573; F from photo.