Ipomoea austrobrasiliensis

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

147. Ipomoea austrobrasiliensis J.R.I. Wood & Scotland, Kew Bull. 72 (9): 2. 2017. (Wood and Scotland 2017a: 2)

Ipomoea batatoides var. angulata Choisy in A.P. de Candolle , Prodr. 9: 376. 1845. (Choisy 1845: 376). Type. BRAZIL. São Paulo, Martius s.n. (lectotype M0184900).

Type.

BRAZIL. Paraná, Mun. Paranagua, Pico Torto, 15 Jan. 1970, G. Hatschbach 23340 (holotype MBM12820, isotypes F, K, MO).

Description.

Vigorous climbing perennial of unknown height, glabrous in all parts. Leaves petiolate, generally large, 10-22 × 9-16 cm, ovate, cordate with rounded auricles, acute to shortly acuminate, margin slightly undulate to subsinuate, sometimes with a distinct tooth above the auricle, glabrous on both surfaces but abaxially paler with prominent venation, the main veins with distinct pale margins; petioles 8-16 cm. Inflorescence of lax, axillary, pedunculate cymes; peduncles 3-10 cm; bracteoles 1-3 mm, linear-oblong, margins scarious, caducous; secondary peduncles 2-3.5 cm; tertiary peduncles (if present) c. 1.5 cm; pedicels 10-18 mm, thickened upwards; sepals subequal, coriaceous, convex, rounded, outer 9-12 × 6-7 mm, obovate; inner slightly wider, broadly elliptic with scarious margins; corolla 4.5-6 cm long, narrowly funnel-shaped, tube pale, limb deep pink, somewhat lobed, c. 4 cm diam. Capsules and seeds not seen.

Illustration.

Figure 86 .

Distribution.

Endemic to moist Atlantic forest below 300 m in Southern Brazil.

BRAZIL. Paraná: Jacarehy, P. Dusen 11400 (K, S, MICH, GH); Mun. Guaratuba, Serra do Araraquara, G. Hatschbach 12504 (MGM); Mun. Paranaqua, Picadão Cambará-Col. Limeira, G. Hatschbach 18597 (MBM). Santa Catarina: Pinhal da Companhia, R. Reitz & Klein 4102 (US); São Francisco do Sul, R. Reitz & Klein 6615 (US). São Paulo: type of Ipomoea batatoides var. angulata .

Notes.

Distinct from Ipomoea goyazensis because of the branched, well-developed cymes with long peduncles, large leaves and somewhat campanulate corolla. From I. batatoides it is distinguished by the longer sepals and larger leaves which are undulate and often somewhat angled, almost with a lateral tooth, hence Choisy’s varietal name of angulata .

This has been identified as Ipomoea goyazensis , perhaps because Choisy treated I. goyazensis as a synonym of I. batatoides var. angulata . Ipomoea goyazensis is a quite different cerrado species whereas I. austrobrasiliensis is a plant of the Atlantic forests of southern Brazil and has not been found in the cerrados of Goiás or further north in Brazil. Plants called Ipomoea goyazensis ( Simao-Bianchini et al. 2016) are a mixture of I. austrobrasiliensis and glabrous forms of I. goyazensis .

Figures

Figure 86. Ipomoea austrobrasiliensis. A habit B leaf C outer sepal D inner sepal E corolla opened out to show stamens F ovary and style. Drawn by Rosemary Wise A, C-F from Reitz & Klein 6615; B from Reitz & Klein 4102.