Ipomoea maurandioides Meisn. in Martius et al.

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

356. Ipomoea maurandioides Meisn. in Martius et al. , Fl. Brasil. 7: 275. 1869. (Meisner 1869: 275)

Ipomoea serpens var. albiflora Hallier f., Bull. Herb. Boiss. 7 (5), append. 1: 49. 1899. (Hallier 1899c: 49). Type. PARAGUAY. [ Paraguarí], near Pirayú, E. Hassler 248 (holotype G, not found).

Ipomoea subtomentosa forma albiflora (Hallier f.) O’Donell, Arq. Mus. Paranaense 9: 241. 1952. ( O’Donell 1952: 241).

Ipomoea serpens var. subtomentosa Chodat & Hassl., Bull. Herb. Boissier , sér. 2, 5: 694. (Chodat and Hassler 1905: 694). Type. PARAGUAY. [Cordillera], Tobatí, E. Hassler 6109 (lectotype G00175189, designated here; isolectotypes BM000089475, G00175188).

Ipomoea subtomentosa (Chodat & Hassl.) O'Donell , Arq. Mus. Paranaense 9: 239. 1952. ( O’Donell 1952: 239).

Ipomoea maurandioides var. subtomentosa (Chodat & Hassl.) J.R.I. Wood & Scotland, Kew Bull. 70 (31): 33. 2015. (Wood et al. 2015: 33).

Ipomoea serpens forma crassifolia Chodat & Hassler, Bull. Herb. Boissier , sér. 2, 5: 694. 1905 (Chodat and Hassler 1905: 694). Type. PARAGUAY. Cordillera, E. Hassler 6316 (isotypes BM, K, S12-2163).

Ipomoea carajasensis D.F. Austin , Acta Amazonica 11: 291. 1981. (Austin 1981: 291). Type. BRAZIL. Pará, Marabá, Serra dos Carajas, 700 m, P. Cavalcante 2115 (holotype MG).

Type.

BRAZIL. Rio Grande do Sul, Porto Alegre, F. Sello 3619 (B†, image F!, isotype NY00319201).

Description.

Trailing or twining herb from central tap root, stems glabrous to thinly pubescent. Leaves petiolate, 3-5 × 1-5 cm, narrowly ovate-deltoid, acute, sagittate or cordate, the auricles acute to obtuse (rarely rounded), green on both surfaces, glabrous or, rarely thinly pubescent; petioles 1-2(-3.5) cm. Inflorescence of axillary, pedunculate, 1-3-flowered cymes; peduncles 0.5-4.5; bracteoles minute, c. 1 mm long, deltoid, caducous; secondary peduncles (if present) 7-17 mm; pedicels 5-21 mm; sepals unequal, glabrous, outer 5-8 mm, broadly oblong-lanceolate or oblong-ovate, obtuse, greenish-scarious, 3-veined; inner 9-12 mm, oblong-oblanceolate, rounded and often mucronulate, with broad scarious margins; corolla 4-6 cm long, pink, funnel-shaped, glabrous, limb 3.5-4 cm diam., unlobed. Capsules 12 × 6 mm, ovoid, glabrous; seeds 6 × 2.5 mm, blackish, tomentellous.

Illustrations. O’Donell (1959b: 188); Figures 5G , 9E , 171 , 173H-M .

Distribution.

Locally abundant in open, dry sandy and rocky cerrado and campo rupestre but especially characteristic of rock outcrops; northern Argentina, eastern Paraguay, eastern Bolivia and scattered locations in Brazil.

ARGENTINA. Corrientes: T.S. Ibarrola 2545 (LIL). Misiones: B.S. Bertoni 2568 (LIL).

PARAGUAY. Amambay: T.M. Pedersen 14655 (G); Cerro Corá, N. Soria & Ortiz 1953 (FCG, G); ibid., E. Zardini et al. 4165 (FCQ, MO); ibid., I. Basualdo 6339 (FCQ). Central: Teague 552 (BM). Concepción: Rancho Esperanza, R. Degen 2467 (FCQ). Cordillera: Limpio-Emboscada, C. Ezcurra & F. Mereles 1790 (FCQ, SI); Tobatí, R. Degen & E. Zardini 589 (FCQ). Paraguarí: L. Bernardi 18715 (G); La Colmena, F. Mereles & G. Parini 7810 (FCQ); P.N. Ybycu’í, E. Zardini & P. Aquino 29011 (PY). San Luis: K. Fiebrig 5340 (K).

BRAZIL. Bahia: Mun. Palmeiras, M.L. Guedes et al. PCD 2036 (ALCB, K); Sano et al. 14538 (K, USP); Sierra de Caitité, R.M. Harley 21280 (CEPEC, K). Ceará: Chapada de Ibiapaba, A. Fernandes s.n. (EAC). Minas Gerais: L. Rossi et al. 6987 (K); R.C. Forzza et al. 2692 (K); R. Simão-Bianchini et al. CFCR 11665 (SPF, K), 11503 (SPF, K); M.M. Arbo et al. 4168 (CTES); H.S. Irwin et al. 21918 (NY), 22892 (NY). Pará: C.R. Sperling et al. 5610 (MG, NY). Rio Grande do Sul: Type of Ipomoea maurandioides . Also Mato Grosso, Mato Grosso do Sul and Paraná fide Flora do Brasil (2020), in all of which it might be expected.

BOLIVIA. Santa Cruz: Germán Busch, camino a Rincón del Tigre, D. Soto & I. Linneo 1303 (K, LPB, USZ); Chiquitos, Valle de la Luna. Serranía de San José, J.R.I. Wood et al. 22871 (HSB, K, LPB); Santiago de Chiquitos, J.R.I. Wood & D. Villarroel 25571 (K, LPB, USZ, UB); entre Quimome y El Tinto, J.R.I. Wood & P. Pozo 25056 (K, LPB, UB, USZ); Cordillera, A. Fuentes & G. Navarro 2086 (LPB, USZ); Ángel Sandoval, Las Petas J.R.I. Wood et al. 24826 (K, LPB, UB, USZ); Velasco, Cerro Pelao, J.R.I. Wood & H. Huaylla 20780 (HSB, K, LPB, USZ); 10 km S. de San Rafael M. Atahuachi et al. 1435 (BOLV, LPB).

Notes.

This species is stored in many herbaria under the name Ipomoea serpens Meisn. but this is a later homonym of I. serpens L. (1759) and, in any case, the type material represents I. paludicola .

It is a relatively slender plant, not unlike a robust specimen of Convolvulus arvensis L., often trailing and growing around rocks, and recognised by its habit combined with the very unequal sepals, the inner sepals rounded and much longer than the ribbed outer sepals. The inflorescence commonly consists of solitary flowers but a cymose inflorescence with several flowers is not uncommon. Plants are usually completely glabrous but plants with pubescent leaves occur sporadically throughout its range and can be recognised as var. subtomentosa . Some Brazilian examples, such as Harley 21280 (K) or Sano et al. 14538 (K) are especially hirsute.

It is commonly confused with Ipomoea paranaensis and may intergrade with that species but the sepals are consistently shorter.

Figures

Figure 5. Sepals of Ipomoea species. A Ipomoea descolei B I. paraguariensis C I. australis D I. purpurea (left), I. nil (right) E I. incarnata F I. pintoi G I. maurandioides H I. pubescens. Photographs of A by Hector Keller; B and G by T. Carruthers; C (Wood et al. 27708); E (Wood 27756) and H (Wood 27675) by Beth Williams; D by John Pink; F (Queiroz 15956) by Hibert Huaylla.

Figure 9. Pollen of Ipomoea species. A I. hieronymi (Wood et al. 28055) B I. wolcottiana (Hughes et al. 1911) C I. bonariensis (Wood et al. 27871) D I. bahiensis (Queiroz 15975) E I. maurandioides (Krapovickas & Cristobal 1573) F I. corymbosa (Jurgensen 612) G I. sericosepala (Wood 28122) H I. tiliifolia (Beddome 5581). Photos by Robert Scotland.

Figure 171. Ipomoea maurandioides. A habit with solitary flowers B habit with cymose inflorescence C outer sepal D inner sepal E corolla opened out to show stamens F ovary and style G capsule H seed. Drawn by Rosemary Wise A from Petersen 14655; B-F from Wood & Williams 27842; G, H from Wood & Pozo 25056.

Figure 173. A-G Ipomoea mucronatoproducta. A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style F. shoot with your fruiting inflorescence G calyx with young fruit. Drawn by Rosemary Wise from Wood & Villarroel 25474.