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).