Ipomoea macedoi Hoehne (1950:110)

Marinho, Antoniela Morais, Delgado-Júnior, Geadelande Carolino & Buril, Maria Teresa, 2017, The rediscovery of Ipomoea macedoi (Convolvulaceae), Phytotaxa 302 (1), pp. 71-76 : 72-73

Ipomoea macedoi Hoehne (1950:110)

Type:— BRAZIL, Minas Gerais, Ituiutaba, 9 May, 1948, A. Macedo 1066 (Holotype SP 000576!, isotypes BM 001191063, SPF 00074153!, S 07-4670!). Figures 2–3 .

Herbaceous vines, stems green-vinaceous, yellowish when old, sparsely pilose with simple hairs, 0.1–0.16 cm long, these mostly in the axils and on young stems; internodes ± 3–11 cm long, latex absent; cotyledons 3 × 2.6 cm, rotund, base truncate, apex lobate, glabrous. Leaves dimorphic, ovate-cordate or deltoid, 1.3–9 × 2.2–7 cm, entire to 3-lobed, the base cordate to slightly cordate or hastate, apex acuminate, often mucronate, margins ciliolate, adaxial surface glabrous, abaxial surface completely glabrous or with hairs restricted to the veins, punctate; venation brochydodromous, midrib prominent abaxially and slightly raised adaxially, ca. 8 pairs of secondary veins, not prominent; petiole 1.3–8 cm long, sulcate, sparsely pilose. Inflorescences showy, diurnal, odorless, axillary, 1–2-flowered, drooping; peduncles 1–3 cm long; pedicels 2.2–7 cm long, pilose; bracteoles 1 pair at the pedicel base, narrowly elliptical, 1 × 0.1 cm, apex acuminate, pilose. Sepals unequal, membranous, veins evident; the two outer sepals 1.5–2.5 × 0.7–1 cm, ovate, the base cordate, apex acuminate, margins entire or with 1–3 teeth in basal portion on each side, adaxially glabrous, abaxially ciliate glabrous; the middle sepal asymmetrical, 2 × 0.5 cm, midway in shape between the inner and outer, abaxially pilose, with a basal tooth, margins scarious, ciliate; the two inner sepals 1 × 0.3 cm, narrowly-elliptical, the base cuneate, apex acuminate, margins scarious, pilose. Corolla funnelform, 4–5 × 2–3 cm, light rose with dark midpetaline bands, the throat vinaceous, glabrous. Stamens included, unequal, longer than the pistil; filaments with simple trichomes at the base; longer filaments 1.3–2 cm, shorter ones 0.5–1 cm long, anthers 3.5 cm long, vinaceous; pollen echinulate, pantoporate. Pistil included, glabrous, nectary disk annular and slightly lobed; ovary conical, straight at the base becoming lobate at the apex, 4-locular, 1 ovule per locule, the style 1.2–1.6 cm long; vinaceous, stigmatic lobes 2, capitate, verrucose. Fruits and seeds unknown.

Specimens examined: BRASIL, Rio Grande do Norte: Felipe Guerra, Cachoeira do Roncador , - 5.575194 S, - 37.678972 W, 41 m., 27 May 2015, Tomaz, E. C. et al. 50 ( UFRN) ; ibid, - 5,57943333 S, - 37,67805556 W, 56 m., 21 Apr 2016, Marinho, A. M. et al. 250 ( PEUFR) ; Apodi, Riacho das Cabras, - 5.66417 S, - 37.7989 W, 90 m., 27 Apr 1980, Oliveira, O. F. et al. 560 ( MOSS) ; ibid. Oliveira, O. F. et al. 561 ( MOSS) ; ibid., Oliveira, O. F. et al. 574 ( MOSS) .

Figures

FIGURE 2. Diagnostic characters and habitat of Ipomoea macedoi Hoehne from Rio Grande do Norte. A. Ovary in a cross section, showing the four empty locules. B. Ovary, nectary disk and filaments base. C. Flower. D. Calyx. E-F.Habitat. (A. M. Marinho, A. S. Soares e L. O. F. Sousa: 250—PEUFR).

FIGURE 3. Ipomoea macedoi Hoehne. A. fertile branch; B. cotyledon; C–D. leaf variation; E. ovary in cross section; F. corolla, longitudinal section; G. calyx; H. stamen; I. pistil; J. sepals, outer (left) to the inner (right). (A. M. Marinho, A. S. Soares e L. O. F. Sousa: 250—PEUFR). Drawn by Regina Carvalho.