Ipomoea marabaensis D.F. Austin & R. Secco

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

97. Ipomoea marabaensis D.F. Austin & R. Secco , Bol. Mus. Paraense "Emilio Goeldi", n.s., Bot. 4 (2): 188. 1988. (Austin and Secco 1988: 188)

Type.

BRAZIL. Pará, Marabá, Carajás, Serra Sul, 16 April 1986, R.S. Secco et al. 708 (holotype MG131894).

Description.

Erect or clambering shrub, rootstock moderately stout, spreading horizontally with a rhizome or similar structure, stems adpressed pilose or glabrous, woody at least below. Leaves very shortly petiolate, 5-12 × 0.3-2 cm, oblong or lanceolate, apex acuminate, obtuse and mucronate, base cuneate, glabrous (juveniles pubescent) on both surfaces, margins sometimes inrolled, abaxially paler the midrib and side veins highlighted by pubescence. Inflorescence of 1(-3)-flowered axillary cymes from the upper leaf axils, peduncles 2-4 mm, pubescent; bracteoles filiform, 3 mm, caducous; sepals subequal, 12-15 × 5-6 mm, ovate, obtuse, outer thinly pubescent; inner densely white-tomentose, rounded, the margins scarious but hirsute; corolla 6.5-8 cm long, funnel-shaped, deep lilac, densely pubescent on midpetaline bands; limb 3.5 cm diam. Capsules ovoid, glabrous; seeds 5-8 mm, woolly on margins.

Illustration.

Figure 63 .

Distribution.

Perhaps endemic to the Serra dos Carajás in Brazil, although it is cited for Tocantins by Simão-Bianchini et al. (2016).

BRAZIL. Pará: Marabá, Serra dos Carajás, 700-750 m, A.S.L. da Silva et al. 1773 (MG, MO, NY); R.S. Secco & R.P. Bahia 730 (MG); Canaa dos Carajas, V.T. Giorni et al. 144 (RB). Mun. Tucuruí, Represa Tucuruí, T. Plowman et al. 9610 (FTG); ibid., T. Plowman et al. 9771 (FTG).

Note.

The correct spelling should be marabaensis. “marabensis” (sic) at the start of the protologue would be an error. It is the only occurrence (out of 11) in the paper where the spelling “marabaensis” is not used.

• Species 98-108 form a clade in the phylogeny inferred from 605 nuclear gene regions.

Figures

Figure 63. Ipomoea marabaensis. A habit B habit with inflorescence C outer sepal D middle sepal E inner sepal F corolla G corolla opened out to show stamens H ovary and style. Drawn by Rosemary Wise A-E, G-H from Silva et al. 1773; F from photo by R. Harley.